Document:

<PAGE>   1
                                                                  EXHIBIT 10.5a

                               FIRST AMENDMENT TO
                      AMENDED AND RESTATED CREDIT AGREEMENT
                            AND CONSENT OF GUARANTORS

                  This FIRST AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT
AND CONSENT OF GUARANTORS (this "Amendment") is dated as of July 25, 2000 and
entered into by and among MOBILE MINI, INC., a Delaware corporation
("Borrower"), the banks and other financial institutions signatory hereto that
are parties as Lenders to the Credit Agreement referred to below (the "Existing
Lenders"), the New Lenders referred to below, and BT COMMERCIAL CORPORATION, as
agent (in such capacity, the "Agent") for the Lenders and the Issuing Bank (as
defined in the Credit Agreement referred to below).

                                    RECITALS

                  Whereas, the Borrower, the Existing Lenders, and the Agent
have entered into that certain Amended and Restated Credit Agreement dated as of
December 27, 1999 (the "Credit Agreement"; capitalized terms used in this
Amendment without definition shall have the meanings given such terms in the
Credit Agreement); and

                  Whereas, the Borrower has requested that the Existing Lenders
consent, subject to the conditions and upon the terms set forth in this
Amendment, to an increase in the Revolving Credit Commitments and additional
Term Loans to the Borrower;

                  Whereas, certain financial institutions desire to become
Lenders under the Credit Agreement (the "New Lenders" and, together with the
Existing Lenders, the "Lenders"); and

                  Whereas, the Additional Term Lenders (as defined below) are
willing to make additional Term Loans and certain of the Existing Lenders are
willing to increase the Revolving Credit Commitment, subject to the conditions
and on the terms set forth herein;

                  NOW THEREFORE, in consideration of the premises and the mutual
agreements set forth herein, the Borrower, the Lenders, and the Agent agree as
follows:

                  1. AMENDMENTS TO CREDIT AGREEMENT. Subject to the conditions
and upon the terms set forth in this Amendment and in reliance on the
representations and warranties of the Borrower set forth in this Amendment, the
Credit Agreement is hereby amended as follows:
<PAGE>   2
                  1.1 AMENDMENTS TO DEFINITIONS. (a) The definitions of
"Proportionate Share," "Term Loans" and "Total Commitments" contained in Section
1.1 of the Credit Agreement are deleted in their entirety and replaced with the
following:

                           "Proportionate Share of a Lender means (a) with
         respect to all provisions relating to the Revolving Loans or Letters of
         Credit, a fraction, expressed as a decimal, obtained by dividing its
         Revolving Credit Commitment, or if the Revolving Credit Commitments
         have been terminated, the sum of the outstanding Revolving Loans of
         such Lender plus its participations in Letter of Credit Obligations
         then outstanding by the Revolving Credit Commitments of all Revolving
         Lenders, or if the Revolving Credit Commitments have been terminated,
         the sum of the outstanding Revolving Loans of all Lenders plus the
         Letter of Credit Obligations then outstanding; (b) with respect to all
         provisions relating to the Term Loans, a fraction, expressed as a
         decimal, obtained by dividing the outstanding Term Loans of such Lender
         by the sum of the outstanding Term Loans of all Lenders; and (c)
         otherwise, a fraction, expressed as a decimal, obtained by dividing the
         sum of (i) the outstanding Term Loans of such Lender plus (ii) its
         Revolving Credit Commitment or, if the Revolving Credit Commitments
         have been terminated, the sum of the outstanding Revolving Loans of
         such Lender plus its participations in Letter of Credit Obligations
         then outstanding by the sum of (x) the outstanding Term Loans of all
         Lenders plus (y) the Revolving Credit Commitments of all Lenders or, if
         the Revolving Credit Commitments have been terminated, the sum of the
         outstanding Revolving Loans of all Lenders plus the Letter of Credit
         Obligations then outstanding."

                           "Term Loans means, collectively, the Original Term
         Loans and the Additional Term Loans."

                           "Total Commitments means the sum of the Commitments
         of all Lenders, which shall not exceed $175,033,333.33."

                           (b) The following definitions are added to Section
1.1 of the Credit Agreement in proper alphabetical order:

                           "Additional Term Loan Commitment of a Lender means
         its commitment to make Additional Term Loans, up to the amount set
         forth opposite its name on Annex I, as such annex may be amended from
         time to time (including any reduction based upon the appraisals
         referred to in Section 5.3(a)), under the heading "Additional Term Loan
         Commitment."

                           "Additional Term Lender means a Lender which has an
         Additional Term Loan Commitment.

                           "Additional Term Loans has the meaning given such
         term in Section 2.1(a)(ii).

                                     - 2 -
<PAGE>   3
                           "First Amendment means that certain First Amendment
         to Amended and Restated Credit Agreement and Consent of Guarantors
         dated as of July 25, 2000 among the Borrower, the Lenders parties
         thereto and the Agent."

                           "First Amendment Effective Date means the date on
         which the First Amendment becomes effective in accordance with its
         terms."

                           "Original Term Loans has the meaning given such term
         in Section 2.1(a)(i)."

                           "Original Term Loan Commitment has the meaning given
         such term in Section 2.1(a)(i)."

                           1.2 AMENDMENTS TO SECTION 2.1. Section 2.1 of the
Credit Agreement is amended as follows:

                           (a) The references to "Term Loan", "Term Loans" and
"Term Loan Commitment" in Section 2.1(a)(i) are deleted and replaced with
"Original Term Loan", "Original Term Loans" and "Original Term Loan Commitment",
respectively.

                           (b) Subsections (ii) and (iii) of Section 2.1(a) are
renumbered (iii) and (iv) respectively, and the following subsection (ii) is
added:

                           "(ii) Subject to the terms and conditions set forth
          in this Agreement and in the First Amendment, each Additional Term
          Lender severally agrees to make to the Borrower a term loan (each
          individually, an "Additional Term Loan" and collectively, the
          "Additional Term Loans") in an amount not to exceed such Lender's
          Additional Term Loan Commitment, which obligation (and Additional Term
          Loan Commitment) shall be zero after the making of the Additional Term
          Loans."

                           (c) Subsection 2.1(b)(i) is amended to add the
following at the end thereof:

                           "The Borrower shall execute and deliver to each
         Additional Term Lender on the First Amendment Effective Date a Term
         Note in the principal amount of that Lender's Additional Term Loan
         Commitment."

                           (d) Subsection 2.1(b)(ii) is deleted and replaced
with the following:

                           "(ii) The Borrower shall repay the principal amount
          of the Term Loans in equal monthly installments, based on a 60 month
          amortization of the then-outstanding balance of the Term Loans in
          equal monthly installments (each a "Scheduled Term Loan Installment"
          and collectively the "Scheduled Term Loan Installments") on the last
          day of each month commencing August 31, 2000. The Term Loans shall be
          repaid in full on the Expiration Date and, notwithstanding the
          foregoing, the Scheduled Term Loan Installment due on the Expiration
          Date shall be in the amount necessary to repay the Term Loans in
          full."

                                     - 3 -
<PAGE>   4
                           1.3 AMENDMENT TO SECTION 2.2. Section 2.2 of the
Credit Agreement is amended to delete the reference therein to "120,000,000" and
to replace it with "160,000,000".

                           1.4 AMENDMENT TO SECTION 5.2. The caption and first
sentence of Section 5.2 of the Credit Agreement are deleted in their entirety
and replaced with the following:

                           "5.2 Conditions Precedent to all Loans and Letters of
         Credit. The obligation of each Lender to fund its Term Loan (including
         the obligation of any Additional Term Lender to fund its Additional
         Term Loan) and its Proportionate Share of any requested Revolving Loan
         or of the Agent to cause the Issuing Bank to issue any requested Letter
         of Credit is subject to the conditions precedent set forth below."

                           1.5 ADDITION OF NEW SECTION 5.3. Article V of the
Credit Agreement is amended to add the following Section 5.3:

                           "5.3 Conditions Precedent to Additional Term Loans.
         In addition to the conditions set forth in Section 5.2 above, the
         obligation of each Additional Term Lender to fund its Additional Term
         Loan is subject to the conditions precedent set forth below:

                           (a) The Agent shall have received (i) appraisals of
         the fee-owned Real Property subject to the Mortgages and the Equipment,
         and shall have determined in its sole discretion that the value of such
         Real Property and Equipment supports the amount of the Term Loans (but
         in no event shall the Term Loans exceed the sum of 60% of the appraised
         fair market value of such Real Property and 80% of the orderly
         liquidation value of the Equipment) and (ii) appraisals of the fair
         market value and orderly liquidation value of the Inventory, in each
         case at the Borrower's expense and prepared by an appraiser
         satisfactory to the Agent and in form, scope and substance satisfactory
         to the Agent.

                           (b) The Agent shall have received such Phase I
         environmental reports as shall be requested by the Agent, at the
         Borrower's expense and prepared by a firm satisfactory to the Agent and
         in form, scope and substance satisfactory to the Agent.

                           (c) The Agent shall have received for each Additional
         Term Loan Lender, a Term Note, duly executed by the Borrower.

                           1.6 AMENDMENT TO SECTION 7.2. Section 7.2 of the
Credit Agreement is amended to add the following subsection (d):

                           "(d) Deliveries to Lenders. The Borrower will deliver
         copies of any of the certificates and reports under this Section 7.2
         and the appraisals required by Section 5.3 to any Lender requesting
         such copies."

                           1.7 AMENDMENT TO SECTION 7.5. Section 7.5 of the
Credit Agreement is amended to add the following sentence at the end thereof.

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<PAGE>   5
                           "A representative of any Lender may accompany the
         Agent, at the Lender's expense."

                           1.8 AMENDMENT TO ANNEX I. Annex I to the Credit
Agreement is deleted in its entirety and replaced with Annex I attached hereto.

                  2. REALIGNMENT OF REVOLVING CREDIT COMMITMENTS AND REVOLVING
LOANS; NEW LENDERS. (a) On the First Amendment Effective Date, and
simultaneously with the effectiveness of this Amendment, (i) all Revolving Loans
of the Existing Lenders outstanding on such date which are Eurodollar Rate Loans
shall be converted to Prime Rate Loans, and the Borrower shall pay to each such
Existing Lender any amount that would be owing to such Existing Lender on such
date under Section 4.13(d) of the Credit Agreement as a result of such
conversion, together with all accrued and unpaid interest thereon, and (ii) the
Agent and the Lenders shall, among themselves, purchase or sell such interests
in the outstanding Revolving Loans as may be necessary so that such Revolving
Loans are held by the Lenders in accordance with their respective Revolving
Credit Commitments.

                  (b) By its execution of this Amendment each New Lender becomes
a party to the Credit Agreement, agrees that it will perform its obligations as
a Lender under the terms of the Credit Agreement as if it had originally been a
party thereto and appoints and authorizes the Agent to take such action as agent
on its behalf and to exercise such powers under the Credit Agreement and the
Credit Documents as are delegated to the Agent, together with such powers
reasonably incidental thereto.

                  3. REPRESENTATIONS AND WARRANTIES OF THE BORROWER. In order to
induce the Lenders and the Agent to enter into this Amendment, the Borrower
represents and warrants to each Lender, the Issuing Bank and the Agent that the
following statements are true, correct and complete:

                  3.1 POWER AND AUTHORITY. Each of the Credit Parties has all
corporate power and authority to enter into this Amendment and, as applicable,
the Consent of Guarantors attached hereto (the "Consent") and the amendments to
the Credit Documents executed and delivered herewith and to issue the Notes on
the First Amendment Effective Date (this Amendment, the Consent, such Notes and
such amendments to the Credit Documents being referred to herein as the
"Amendment Documents"), and to carry out the transactions contemplated by, and
to perform its obligations under or in respect of, the Amendment Documents and
the Credit Agreement as amended hereby.

                  3.2 CORPORATE ACTION. The execution and delivery of the
Amendment Documents and the performance of the obligations of each Credit Party
under or in respect of the Amendment Documents and the Credit Agreement as
amended hereby have been duly authorized by all necessary corporate action on
the part of each of the Credit Parties.

                  3.3 NO CONFLICT OR VIOLATION OR REQUIRED CONSENT OR APPROVAL.
The execution and delivery of the Amendment Documents and the performance of the
obligations of each Credit Party under or in respect of the Amendment Documents
and the Credit Agreement as

                                     - 5 -
<PAGE>   6
amended hereby do not and will not conflict with or violate (a) any provision of
the articles or certificate of incorporation or bylaws of any Credit Party, (b)
any Requirement of Law, (c) any order, judgment or decree of any court or other
governmental agency binding on any Credit Party or any of its Subsidiaries, or
(d) any indenture, agreement or instrument to which any Credit Party or any of
its Subsidiaries is a party or by which any Credit Party or any of its
Subsidiaries, or any property of any of them, is bound, and do not and will not
require any consent or approval of any Person.

                  3.4 EXECUTION, DELIVERY AND ENFORCEABILITY. The Amendment
Documents have been duly executed and delivered by each Credit Party which is a
party thereto and are the legal, valid and binding obligations of such Credit
Party, enforceable in accordance with their terms, except as enforceability may
be affected by applicable bankruptcy, insolvency, and similar proceedings
affecting the rights of creditors generally, and to general principles of
equity.

                  3.5 NO DEFAULT OR EVENT OF DEFAULT. No event has occurred and
is continuing or will result from the execution and delivery of the Amendment
Documents that would constitute a Default or an Event of Default.

                  3.6 NO MATERIAL ADVERSE EFFECT. No event has occurred that has
resulted, or could reasonably be expected to result, in a Material Adverse
Effect.

                  3.7 REPRESENTATIONS AND WARRANTIES. Each of the
representations and warranties contained in the Credit Documents is and will be
true and correct in all material respects on and as of the date hereof and as of
the effective date of this Amendment, except to the extent that such
representations and warranties specifically relate to an earlier date, in which
case they were true, correct and complete in all material respects as of such
earlier date.

                  4. CONDITIONS TO EFFECTIVENESS OF THIS AMENDMENT. This
Amendment shall be effective only if and when signed by, and when counterparts
hereof shall have been delivered to the Agent (by hand delivery, mail or
telecopy) by, the Borrower and each Lender and only if and when each of the
following conditions is satisfied:

                  4.1 CONSENT OF GUARANTORS; NOTES. Each of the Guarantors shall
have executed and delivered to the Agent the Consent, and the Borrower shall
have executed and delivered to the Agent Term Notes evidencing the Additional
Term Loans and Revolving Notes for each New Lender and each Existing Lender with
an increased Revolving Credit Commitment (such Notes, the "New Notes").

                  4.2 NO DEFAULT OR EVENT OF DEFAULT; ACCURACY OF
REPRESENTATIONS AND WARRANTIES. No Default or Event of Default shall exist and
each of the representations and warranties made by the Credit Parties herein and
in or pursuant to the Credit Documents shall be true and correct in all material
respects as if made on and as of the date on which this Amendment becomes
effective (except that any such representation or warranty that is expressly
stated as being made only as of a specified earlier date shall be true and
correct as of such earlier date), and the Borrower shall have delivered to the
Agent a certificate confirming such matters.

                                     - 6 -
<PAGE>   7
                  4.3 AMENDMENTS TO COLLATERAL DOCUMENTS. The Borrower shall
have delivered to the Agent duly executed and acknowledged amendments to the
Mortgages and such other Collateral Documents as may be requested by the Agent,
each in form and substance satisfactory to the Agent, and such other documents
as may be necessary or desirable, in the opinion of the Agent, to perfect or
continue the perfection of the Liens in favor of the Agent, and such
endorsements to the mortgagee title policies as may be requested by the Agent.

                  4.4 CORPORATE DOCUMENTS AND OPINIONS OF COUNSEL. The Borrower
shall have delivered to the Agent copies of resolutions of each of the Credit
Parties approving and authorizing this Amendment and the other Amendment
Documents, together with an incumbency certificate for the persons executing the
Amendment Documents and opinions of counsel to the Borrower, as to the matters
set forth in Sections 3.1, 3.2, 3.3, and 3.4 hereof with respect to the Credit
Parties and such other matters as the Agent or Majority Lenders may reasonably
request.

                  4.5 FEES; EXPENSE REIMBURSEMENTS. The Borrower shall have paid
all fees then due to pursuant to the fee letter dated July 25, 2000 between the
Borrower and BTCC and expense reimbursements due to the Agent pursuant to
Section 11.10 of the Credit Agreement.

                  4.6 OTHER DOCUMENTS. The Agent shall have received such
documents as the Agent may reasonably request in connection with this Amendment.

                  5. EFFECT OF AMENDMENT. From and after the date on which this
Amendment becomes effective, all references in the Credit Documents to the
Credit Agreement shall mean the Credit Agreement as amended hereby, and all
references to the Notes shall include the New Notes. Except as expressly amended
hereby or waived herein, the Credit Agreement and the other Credit Documents,
including the Liens granted thereunder, shall remain in full force and effect,
and are hereby ratified and confirmed.

                  6. APPLICABLE LAW. THE VALIDITY, INTERPRETATIONS AND
ENFORCEMENT OF THIS AMENDMENT AND ANY DISPUTE ARISING OUT OF OR IN CONNECTION
WITH THIS AMENDMENT, WHETHER SOUNDING IN CONTRACT, TORT, EQUITY OR OTHERWISE,
SHALL BE GOVERNED BY THE INTERNAL LAWS AND DECISIONS OF THE STATE OF CALIFORNIA.

                  7. COMPLETE AGREEMENT. The Amendment Documents and the fee
letter executed and delivered by the Borrower and the Agent in connection
therewith set forth the complete agreement of the parties in respect of any
amendment to any of the provisions of any Credit Document or any waiver thereof.

                  8. CAPTIONS; COUNTERPARTS. The catchlines and captions herein
are intended solely for convenience of reference and shall not be used to
interpret or construe the provisions hereof. This Amendment may be executed by
one or more of the parties to this Amendment on any number of separate
counterparts (including by telecopy), all of which taken together shall
constitute but one and the same instrument.

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<PAGE>   8
                  [remainder of page intentionally left blank]

                                     - 8 -
<PAGE>   9
         IN WITNESS WHEREOF, the parties hereto have caused this First Amendment
to Amended and Restated Credit Agreement and Consent of Guarantors to be duly
executed by a duly authorized officer as of the date first above written.

                                        MOBILE MINI, INC.

                                        By:________________________________
                                              Name:________________________
                                              Title:_______________________

                                        BT COMMERCIAL CORPORATION,
                                          as Agent and as a Lender

                                        By:________________________________
                                              Name:________________________
                                              Title:_______________________

                                        BANK OF AMERICA, N.A.,
                                          as a Lender

                                        By:________________________________
                                              Name:________________________
                                              Title:_______________________

                                        DEUTSCHE FINANCIAL SERVICES CORPORATION,
                                          as a Lender

                                        By:________________________________
                                              Name:________________________
                                              Title:_______________________

                                       1
<PAGE>   10
                                        SUMMIT BUSINESS CAPITAL CORP.
                                        (formerly SUMMIT COMMERCIAL/
                                        GIBRALTAR CORPORATION), as a Lender

                                        By:________________________________
                                              Name:________________________
                                              Title:_______________________

                                        BANK ONE, ARIZONA, NA,
                                        as a Lender

                                        By:________________________________
                                              Name:________________________
                                              Title:_______________________

                                        LA SALLE BUSINESS CREDIT, INC.,
                                        as a Lender

                                        By:________________________________
                                        By:________________________________
                                              Name:________________________
                                              Title:_______________________

                                        FIRST UNION NATIONAL BANK, as a Lender

                                        By:_________________________________
                                              Name:_________________________
                                              Title:________________________

                                        BANK LEUMI USA, as a Lender

                                        By:_________________________________
                                              Name:_________________________
                                              Title:________________________

                                      S-2
<PAGE>   11
                              CONSENT OF GUARANTORS

Each of the undersigned is a Guarantor of the Obligations of the Borrower under
the Credit Agreement and hereby (a) consents to the foregoing Amendment, (b)
acknowledges that notwithstanding the execution and delivery of the foregoing
Amendment and the other Amendment Documents, the obligations of each of the
undersigned Guarantors are not impaired or affected and the Guaranties continue
in full force and effect, and (c) ratifies its Guaranty.

                  IN WITNESS WHEREOF, each of the undersigned has executed and
delivered this Consent of Guarantors as of the ___day of July, 2000.

                                        MOBILE MINI I, INC.

                                        By:________________________________
                                              Name:________________________
                                              Title:_______________________

                                        DELIVERY DESIGN SYSTEMS, INC.

                                        By:________________________________
                                              Name:________________________
                                              Title:_______________________
<PAGE>   12
                                                      ANNEX I

                                          LENDERS AND COMMITMENT AMOUNTS

<TABLE>
<CAPTION>
                                                         Revolving Credit            Original Term Loan        Additional Term Loan
              Name and Address of Lender                 Commitment                      Commitment                 Commitment
-------------------------------------------------------  -----------------------  -------------------------  -----------------------
<S>                                                       <C>                     <C>                        <C>
BT COMMERCIAL CORPORATION                                 $21,110,476.14            $1,944,444.48             $3,926,190.47

Domestic Lending Office:
     BT Commercial Corporation
     14 Wall Street
     Third Floor
     New York, New York 10005
     Attention:  Bharathi Baliga
     Telephone:
     Fax:

Eurodollar Lending Office:
     BT Commercial Corporation
     14 Wall Street
     Third Floor
     New York, New York 10005
     Attention:  Bharathi Baliga
     Telephone:
     Fax

Address for Notices:
     BT Commercial Corporation
     14 Wall Street
     Third Floor
     New York, New York 10005
     Attention:  Bharathi Baliga
     Telephone:
     Fax

BANK OF AMERICA, N.A.                                     $23,679,047.64              $972,222.23             $1,308,730.16
(fka NATIONSBANK, N.A.)

Domestic Lending Office:
     Bank of America, N.A.
     901 Main Street, 6th Floor
     Dallas, Texas 75202
     Attention:  Karen Lackey
     Telephone:  214-209-0424
     Fax  214-209-0477
</TABLE>
<PAGE>   13
<TABLE>
<CAPTION>
                                                         Revolving Credit            Original Term Loan        Additional Term Loan
              Name and Address of Lender                 Commitment                      Commitment                 Commitment
-------------------------------------------------------  -----------------------  -------------------------  -----------------------
<S>                                                       <C>                     <C>                        <C>
Eurodollar Lending Office:
     Bank of America, N.A.
     901 Main Street, 6th Floor
     Dallas, Texas 75202
     Attention:  Karen Lackey
     Telephone:  214-209-0424
     Fax  214-209-0477

Address for Notices:
     Bank of America, N.A.
     901 Main Street, 6th Floor
     Dallas, Texas 75202
     Attention:  Lawrence Cannariato
     Telephone:  214-209-0434
     Fax  214-209-3501

DEUTSCHE FINANCIAL SERVICES CORPORATION                   $20,000,000.00              $972,222.23                      0

Domestic Lending Office:
     Deutsche Financial Services Corporation
     1630 Des Peres Road
     Suite 305
     St. Louis, MO  63131
     Attention:  Regional Vice President
     Telephone:  314-822-7555
     Fax:  314-909-0307

Eurodollar Lending Office:
     Deutsche Financial Services Corporation
     1630 Des Peres Road
     Suite 305
     St. Louis, MO  63131
     Attention:  Regional Vice President
     Telephone:  314-822-7555
     Fax:  314-909-0307

Address for Notices:
     Deutsche Financial Services Corporation
     1630 Des Peres Road
     Suite 305
     St. Louis, MO  63131
     Attention:  Regional Vice President
     Telephone:  314-822-7555
     Fax:  314-909-0307
</TABLE>
<PAGE>   14
<TABLE>
<CAPTION>
                                                         Revolving Credit            Original Term Loan        Additional Term Loan
              Name and Address of Lender                 Commitment                      Commitment                 Commitment
-------------------------------------------------------  -----------------------  -------------------------  -----------------------
<S>                                                      <C>                      <C>                        <C>
SUMMIT BUSINESS CAPITAL CORP.                             $20,000,000.00                     0                         0

Domestic Lending Office:
     Summit Business Capital Corp.
     99 Park Avenue, 19th Floor
     New York, NY  10016
     Attention:
     Telephone:  646-658-9100
     Fax:  917-368-0343

Eurodollar Lending Office:
     Summit Business Capital Corp.
     99 Park Avenue, 19th Floor
     New York, NY  10016
     Attention:
     Telephone:  646-658-9100
     Fax:  917-368-0343

Address for Notices:
     Summit Business Capital Corp.
     99 Park Avenue, 19th Floor
     New York, NY  10016
     Attention:
     Telephone:  646-658-9100
     Fax:  917-368-0343

BANK ONE, ARIZONA, NA                                   $23,679,047.64                $972,222.23             $1,308,730.16

Domestic Lending Office:
     Bank One Arizona, NA
     201 North Central Avenue
     21st Floor
     Phoenix, Arizona 85004
     Attention:  Steven Reinhart
     Telephone:  602-221-1947
     Fax:  602-221-1259

Eurodollar Lending Office:
     Bank One Arizona, NA
     201 North Central Avenue
     21st Floor
     Phoenix, Arizona 85004
     Attention:  Steven Reinhart
     Telephone:  602-221-1947
     Fax:  602-221-1259
</TABLE>
<PAGE>   15
<TABLE>
<CAPTION>
                                                         Revolving Credit            Original Term Loan        Additional Term Loan
              Name and Address of Lender                 Commitment                      Commitment                 Commitment
-------------------------------------------------------  -----------------------  -------------------------  -----------------------
<S>                                                       <C>                     <C>                        <C>
Address for Notices:
     Bank One Arizona, NA
     201 North Central Avenue
     21st Floor
     Phoenix, Arizona 85004
     Attention:  Steven Reinhart
     Telephone:  602-221-1947
     Fax:  602-221-1259

LASALLE BUSINESS CREDIT, INC.                             $23,679,047.64              $972,222.23             $1,308,730.16

Domestic Lending Office:
     LaSalle Business Credit, Inc.
     135 South LaSalle Street
     Chicago, Illinois  60603
     Attention:  Christopher Clifford
     Telephone:  (312) 904-8415
     Fax:  (312) 904-6450

Eurodollar Lending Office:
     LaSalle Business Credit, Inc.
     135 South LaSalle Street
     Chicago, Illinois  60603
     Attention:  Christopher Clifford
     Telephone:  (312) 904-8415
     Fax:  (312) 904-6450

Address for Notices:
     LaSalle Business Credit, Inc.
     135 South LaSalle Street
     Chicago, Illinois  60603
     Attention:  Christopher Clifford
     Telephone:  (312) 904-8415
     Fax:  (312) 904-6450

FIRST UNION NATIONAL BANK                                 $22,852,380.94                     0                $2,147,619.06

Domestic Lending Office
     First Union National Bank
     201 South College Street
     CP-6
     Charlotte, North Carolina 28288-0479
     Attention:  Steve Haas
     Telephone:  (704) 715-1966
     Fax:  (704) 374-2703
</TABLE>
<PAGE>   16
<TABLE>
<CAPTION>
                                                         Revolving Credit            Original Term Loan        Additional Term Loan
              Name and Address of Lender                 Commitment                      Commitment                 Commitment
-------------------------------------------------------  -----------------------  -------------------------  -----------------------
<S>                                                       <C>                     <C>                        <C>
Eurodollar Lending Office:
     First Union National Bank
     201 South College Street
     CP-6
     Charlotte, North Carolina 28288-0479
     Attention:  Steve Haas
     Telephone:  (704) 715-1966
     Fax:  (704) 374-2703

Address for Notices:
     First Union National Bank
     201 South College Street
     CP-6
     Charlotte, North Carolina 28288-0479
     Attention:  Steve Haas
     Telephone:  (704) 715-1966
     Fax:  (704) 374-2703

BANK LEUMI USA                                             $5,000,000.00                     0                         0

Domestic Lending Office:
     Bank Leumi USA
     8383 Wilshire Blvd.
     Beverly Hills, CA 90211
     Attention:  Jacques Delvoye
     Telephone:  (323) 966-4727
     Fax:  (323) 966-4252

Eurodollar Lending Office:
     Bank Leumi USA
     8383 Wilshire Blvd.
     Beverly Hills, CA 90211
     Attention:  Jacques Delvoye
     Telephone:  (323) 966-4727
     Fax:  (323) 966-4252

Address for Notices:
     Bank Leumi USA
     8383 Wilshire Blvd.
     Beverly Hills, CA 90211
     Attention:  Jacques Delvoye
     Telephone:  (323) 966-4727
     Fax:  (323) 966-4250
</TABLE><PAGE>   1

EXHIBIT 10.33

                         AMENDMENT NUMBER FIVE TO SECOND
                AMENDED AND RESTATED LOAN AND SECURITY AGREEMENT

         This Amendment Number Five To Second Amended and Restated Loan and
Security Agreement ("Amendment") is entered into as of June 30, 2000, by and
between CONGRESS FINANCIAL CORPORATION (WESTERN), a California corporation
("Congress"), on the one hand, and SENSORY SCIENCE CORPORATION, a Delaware
corporation (fka Go-Video, Inc.) ("Sensory"), and CALIFORNIA AUDIO LABS, LLC, a
California limited liability company ("Cal-Audio", together with Sensory, each a
"Borrower" and collectively the, "Borrowers") on the other hand, in light of the
following:

         FACT ONE: Borrowers and Congress have previously entered into that
certain Second Amended and Restated Loan and Security Agreement, dated as of
August 19, 1998, (as amended from time to time, the "Agreement").

         FACT TWO: Borrowers and Congress desire to further amend the Agreement
as provided for and on the conditions herein.

         NOW, THEREFORE, Borrowers and Congress hereby amend and supplement the
Agreement as follows:

         1. DEFINITIONS. All initially capitalized terms used in this Amendment
shall have the meanings given to them in the Agreement unless specifically
defined herein.

         2. AMENDMENTS.

                  2.1 Section 1 of the Agreement is amended by adding the
following additional definitions:

              (a) "Collateral Access Agreement" means a landlord waiver,
              mortgagee waiver, bailee letter, or acknowledgment agreement of
              any Customs Broker, warehouseman, processor, lessor, consignee, or
              other Person in possession of, having a lien upon, or having
              rights or interest in the Equipment or Inventory, permitting
              Lender access to, and the right to remain on, the premises where
              any Equipment or Inventory is located, in order to exercise its
              rights and remedies and otherwise deal with the Collateral, in
              each case in form and substance satisfactory to Lender.

              (b) "Customs Broker" shall mean such persons as may be selected by
              Borrowers after the date hereof and after written notice by
              Borrowers to Lender who are reasonably acceptable to Lender to
              perform port of entry services to process Inventory imported by
              Borrowers from outside the United States of America and to supply
              facilities, labor and materials to a Borrower in connection
              therewith, provided, that, as to each such person, (a) Lender
              shall have received a Collateral Access Agreement duly authorized,
              executed and delivered by such person, (b) such agreement is in
              full force and effect and (c) such person shall be in compliance
              in all material respects with the terms thereof.

              (c) "Eligible In-Transit Inventory" shall mean Inventory outside
              the United States of America that is in transit to any of the
              premises of a Customs Broker in the United States, or one of
              Borrowers' facilities in the United States; provided, that, (a)
              Lender has a first priority perfected security interest in and
              control and

                                       1
<PAGE>   2

              possession of originals of all documents of title with respect to
              such Inventory, (b) Lender has received (1) a Collateral Access
              Agreement, duly authorized, executed and delivered by the Customs
              Broker handling the shipping and delivery of such Inventory, by
              the owner and lessor of leased premises or by any party that will
              hold, store, process or modify any such Inventory, as the case may
              be, (2) a copy of the certificate of marine cargo insurance in
              connection therewith in which Lender has been named as an
              additional insured and loss payee in a manner acceptable to
              Lender, and (3) a copy of the invoice and shipping manifest with
              respect thereto, (c) such Inventory is not subject to any Letter
              of Credit Accommodation, and, (d) bills of lading or other
              documents of title with respect to such Inventory name Lender or
              other financial institution or person as Lender may specify as
              consignee pursuant to Section 7.8 herein."

                  2.2 The definition of "Eligible Inventory" in Section 1 of the
Agreement is amended by replacing the language in (f) following "provided,
however" to read as follows:

              "Eligible Inventory which otherwise satisfies the criteria set
              forth herein shall include (i) Inventory at premises of any
              Customs Broker if Lender has received a Collateral Access
              Agreement from the Customs Broker duly authorized, executed and
              delivered by such Customs Broker, and (ii) Eligible In-Transit
              Inventory;"

                  2.3 The Agreement is amended to include Section 7.8 which
shall read as follows:

              "7.8 Bills of Lading and Other Documents of Title. Borrowers shall
              cause all bills of lading and other documents of title relating to
              Eligible Inventory being purchased by Borrowers which are outside
              the United States and in transit to the premises of Borrowers as
              consignee, unless and until Lender may direct otherwise. At such
              time and from time to time as Lender may direct, Borrowers shall
              cause Lender or such other financial institution or other person
              as Lender may specify to be named as consignee. Without limiting
              any other rights of Lender hereunder, at any time on or after an
              Event of Default, or act, condition or event which with notice or
              passage of time or both would constitute an Event of Default,
              Lender shall have the right to endorse and negotiate on behalf of,
              and as attorney-in-fact for, Borrowers any bill of lading or other
              document of title with respect to such goods naming a Borrower as
              consignee to Lender. There shall be three (3) originals of each of
              such bill of lading or other document of title which unless and
              until Lender shall direct otherwise shall be delivered as follows:
              (a) one (1) original to such Customs Broker as Borrowers may
              specify (so long as Lender has received a Collateral Access
              Agreement duly authorized, executed and delivered by such Customs
              Broker), and (b) two (2) originals to Lender or to such other
              person as Lender may designate for such purpose. Borrowers shall
              obtain a copy (but not the originals) of such bill of lading or
              other documents from the Customs Broker. Borrowers shall cause all
              bills of lading or other documents of title relating to goods
              purchased by Borrowers of the premises of a Customs Broker in the
              United States to be issued in a form so as to constitute
              negotiable documents as such term is defined in the Uniform
              Commercial Code."

                  3. REPRESENTATIONS AND WARRANTIES. Borrowers hereby affirm to
Congress that all of Borrowers' representations and warranties set forth in the
Agreement are true, complete and accurate in all respects as of the date hereof.

                                       2
<PAGE>   3

                  4. NO DEFAULTS. Borrowers hereby affirm to Congress that no
Event of Default has occurred and is continuing as of the date hereof.

                  5. CONDITION PRECEDENT. The effectiveness of this Amendment is
expressly conditioned upon receipt by Congress of an executed copy of this
Amendment.

                  6. COSTS AND EXPENSES. Borrowers shall pay to Congress all of
Congress's out-of-pocket costs and expenses (including, without limitation, the
fees and expenses of its counsel, which counsel may include any local counsel
deemed necessary, search fees, filing and recording fees, documentation fees,
appraisal fees, travel expenses, and other fees) arising in connection with the
preparation, execution, and delivery of this Amendment and all related
documents.

                  7. LIMITED EFFECT. In the event of a conflict between the
terms and provisions of this Amendment and the terms and provisions of the
Agreement, the terms and provisions of this Amendment shall govern. In all other
respects, the Agreement, as amended and supplemented hereby, shall remain in
full force and effect.

                  8. COUNTERPARTS; EFFECTIVENESS. This Amendment may be executed
in any number of counterparts and by different parties on separate counterparts,
each of which when so executed and delivered shall be deemed to be an original.
All such counterparts, taken together, shall constitute but one and the same
Amendment. This Amendment shall become effective upon the execution of a
counterpart of this Amendment by each of the parties hereto.

                  IN WITNESS WHEREOF, the parties hereto have executed this
Amendment as of the date first set forth above.

                                      CONGRESS FINANCIAL CORPORATION (WESTERN),
                                      a California corporation

                                      By:  /s/ Bruce Laughton
                                           -----------------------------------
                                      Title:  Vice President

                                      SENSORY SCIENCE
                                      CORPORATION, a Delaware
                                      corporation (fka Go-Video, Inc.)

                                      By:  /s/ Thomas E. Linnen
                                           -----------------------------------
                                      Title:  Executive Vice President & CFO

                                      CALIFORNIA AUDIO LABS, LLC,
                                      a California limited liability company

                                      By:  /s/ Thomas E. Linnen
                                           -----------------------------------
                                      Title:  Executive Vice President & CFO

                                       3
<PAGE>   4

                           REAFFIRMATION OF GUARANTEE

         Each of the undersigned has executed the Guarantee, dated August 19,
1998 (the "Guarantee") in favor of Congress Financial Corporation (Western), a
California corporation ("Congress") respecting the obligations of Sensory
Science Corporation, a Delaware corporation (fka Go-Video, Inc.) ("Sensory"),
and California Audio Labs, LLC, a California limited liability company ("Cal
Audio" together with Sensory, collectively the "Borrowers") owing to Congress.
Each undersigned acknowledges the terms of Amendment Number Five to Second
Amended and Restated Loan and Security Agreement, dated June 30, 2000, and
reaffirms and agrees that (a) the Guarantee remains in full force and effect,
(b) nothing in such Guarantee obligates Congress to notify the undersigned of
any changes in the financial accommodations made available to Borrowers or to
seek reaffirmations of the Guarantee and (c) no requirement to so notify the
undersigned or to seek reaffirmations in the future shall be implied by the
execution of the reaffirmation.

                                       SENSORY SCIENCE CORPORATION,
                                       a Delaware corporation

                                       By:  /s/ Thomas E. Linnen
                                            -----------------------------------
                                       Name:  Thomas E. Linnen
                                       Title:  Executive Vice President & CFO

                                       CALIFORNIA AUDIO LABS, LLC,
                                       a California limited liability company

                                       By:  /s/ Thomas E. Linnen
                                            -----------------------------------
                                       Name:  Thomas E. Linnen
                                       Title:  Executive Vice President & CFO
Dated:  June 30, 2000

                                       4

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