Document:

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                                                                     EXHIBIT 4.9

                                                                         ANNEX C

                               GUARANTEE AGREEMENT

                  GUARANTEE AGREEMENT dated as of October 29, 2001 (the
"Guarantee") between AMPEX CORPORATION, a Delaware corporation ("the
Guarantor"), and SHERBORNE & COMPANY INCORPORATED, a Delaware corporation
("Lender").

                  Ampex Data Systems Corporation, a Delaware corporation (the
"Borrower"), and Lender are parties to a Loan Agreement dated as of even date
hereof (as modified and supplemented and in effect from time to time, the "Loan
Agreement"), providing, subject to the terms and conditions thereof, for loans
("Loans") to be made by Lender to the Borrower in the amount of up to
$2,500,000. The Borrower is a wholly-owned subsidiary of the Guarantor.

                  To induce Lender to enter into the Loan Agreement and to make
the Loans contemplated thereunder, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
Guarantor has agreed to guarantee the Guaranteed Obligations (as hereinafter
defined). Accordingly, the parties hereto agree as follows:

                  SECTION 1. Guaranteed Obligations. The Guarantor hereby
                             ----------------------
irrevocably and unconditionally guarantees to Lender and its successors and
assigns the prompt payment in full when due (whether at stated maturity, by
acceleration or otherwise) of all amounts owing to Lender under the Loan
Agreement or the Secured Promissory Note of even date herewith (the "Note")
evidencing the Loans, including, without limitation, principal of and interest
on the Loans from time to time made by the Lender to Borrower and all other
amounts from time to time owing to the Lender by the Borrower under the Loan
Agreement or under the Note, in each case strictly in accordance with the terms
thereof (such obligations being herein collectively called the "Guaranteed
Obligations"). This is a guarantee of payment and not of collection and the
Guarantor hereby further agrees that the Guarantor will promptly pay any amount
owed by Borrower under any of the Guaranteed Obligations when due.

                  SECTION 2. Obligations Unconditional. The obligations of the
                             -------------------------
Guarantor under this Guarantee hereof are absolute and unconditional,
irrespective of the value, genuineness, validity, regularity or enforceability
of the Loan Agreement, the Note or any other agreement or instrument referred to
herein or therein, or any substitution, release or exchange of any other
guarantee of or security for any of the Guaranteed Obligations, and, to the
fullest extent permitted by applicable law, irrespective of any other
circumstance whatsoever which might otherwise constitute a legal or equitable
discharge or defense of a surety or guarantor. Guarantor hereby

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waives any rights which it may have hereunder to setoff its obligations to
Lender hereunder against any other obligations of Lender from time to time owed
to Guarantor. Without limiting the generality of the foregoing, it is agreed
that the occurrence of any one or more of the following shall not affect the
liability of the Guarantor hereunder:

                (i)   at any time or from time to time, without notice to the
         Guarantor, the time for any performance of or compliance with any of
         the Guaranteed Obligations shall be extended, or such performance or
         compliance shall be waived;

                (ii)  any of the acts mentioned in any of the provisions of the
         Loan Agreement or the Note or any other agreement or instrument
         referred to herein or therein shall be done or omitted;

                (iii) the maturity of any of the Guaranteed Obligations shall be
         accelerated, or any of the Guaranteed Obligations shall be modified,
         supplemented or amended in any respect, or any right under the Loan
         Agreement or the Note or any other agreement or instrument referred to
         herein or therein shall be waived or any other guarantee of any of the
         Guaranteed Obligations or any security therefor shall be released or
         exchanged in whole or in part or otherwise dealt with; or

                (iv)  any lien or security interest granted to, or in favor of,
         the Lender as security for any of the Guaranteed Obligations shall fail
         to be perfected.

The Guarantor hereby expressly waives any requirement that the Lender exhaust
any right, power or remedy to proceed against the Borrower under the Loan
Agreement or the Note or any other agreement or instrument referred to herein or
therein, or against any other person under any other guarantee of, or security
for, any of the Guaranteed Obligations.

              SECTION 3. Reinstatement. The obligations of the Guarantor under
                         -------------
this Guarantee shall be automatically reinstated if and to the extent that for
any reason any payment by or on behalf of the Borrower in respect of the
Guaranteed Obligations is rescinded or must be otherwise restored by any holder
of any of the Guaranteed Obligations, whether as a result of any proceedings in
bankruptcy or reorganization or otherwise and the Guarantor agrees that it will
indemnify the Lender on demand for all reasonable costs and expenses (including,
without limitation, fees of counsel) incurred by the Lender in connection with
such rescission or restoration.

              SECTION 4. Subrogation. The Guarantor hereby agrees that it shall
                         -----------
not exercise any right or remedy arising by reason of any performance by it of
its guarantee herein, whether by subrogation or otherwise, against the Borrower.

              SECTION 5. Remedies. The Guarantor agrees that, as between the
                         --------
Guarantor and the Lender, the obligations of the Borrower under the Loan
Agreement and the Note may be declared to be forthwith due and payable as
provided in the Loan Agreement notwithstanding any stay, injunction or other
prohibition preventing such declaration (or such obligations from

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becoming automatically due and payable) as against the Borrower and that, in the
event of such declaration (or such obligations being deemed to have become
automatically due and payable), such obligations (whether or not due and payable
by the Borrower) shall forthwith become due and payable by the Guarantor.

           SECTION 6. Continuing Guarantee. This guarantee is a continuing
                      --------------------
guarantee, and shall apply to all Guaranteed Obligations whenever arising.

           SECTION 7. Representations and Warranties. Guarantor hereby
                      ------------------------------
represents and warrants to Lender that:

           (a) it is a corporation duly organized, validly existing and in good
standing under the laws of the State of Delaware, is duly qualified as a foreign
corporation and is in good standing in each jurisdiction as to which the
location of its assets or the nature of its business makes qualification
necessary or in which the failure to so qualify would have a material adverse
effect on its conditions or operations, financial or otherwise, and has all
corporate power and authority to conduct its business and to own or hold under
lease its assets and properties, and to execute, deliver and perform all of its
obligations under, this Guarantee and any other related documents to which it is
a party;

           (b) the execution, delivery and performance by Guarantor of this
Guarantee have been duly authorized by all necessary corporate action, do not
contravene its charter, by-laws or any applicable laws, rules, regulations,
orders writs, judgments, injunctions, decrees, determinations or awards, and do
not and will not result in a breach of, or constitute a default under, or
require any consent (other than consents which have been duly obtained and are
in effect, and consents with respect to which Guarantor's failure to obtain such
consents will not result in a material adverse effect on Guarantor or its
business) under, any indenture or other agreement or instrument to which it is a
party or by which it or its properties may be bound or affected;

           (c) no authorization or approval by, and no notice to or filing with,
any governmental authority or regulatory body is required to be obtained or made
in connection with the execution, delivery and performance by it of this
Guarantee;

           (d) this Guarantee constitutes the legal, valid and binding
obligations of Guarantor enforceable against it in accordance with its
respective terms, except as enforceability shall be subject to bankruptcy,
insolvency, moratorium and other similar laws affecting creditors' rights
generally and to general principles of equity; and

           (e) there is no pending or threatened action or proceeding affecting
it before any court, governmental agency or arbitrator which may materially
adversely affect its ability to perform its obligations under this Guarantee or
which purports to affect the legality, validity or enforceability of this
Guarantee.

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         SECTION 8. Lender Acknowledgment. Lender expressly acknowledges that
                    ---------------------
Guarantor is a party to a Collateral Security Agreement dated as of November 6,
2000 ("Collateral Security Agreement") with DDJ Capital Management, LLC, as
agent ("Agent") for the holders ("Holders") from time to time of Borrower's
outstanding Senior Discount Notes ("Discount Notes") referred to therein,
pursuant to which Guarantor has granted to the Agent, as secured party for the
benefit of the Holders of the Discount Notes, a first lien and security interest
in certain "Collateral," as more fully described in the Collateral Security
Agreement ("Collateral"). Lender agrees with Guarantor for the benefit of the
Holders that nothing contained herein is intended to or shall conflict with, and
upon an "Event of Default" under the Discount Notes the rights of Lender
hereunder shall be subject and subordinate to, the rights and remedies of the
Agent, as secured party, and the Holders of the Discount Notes under the
Collateral Security Agreement, in the Collateral or any proceeds thereof.

         SECTION 9. Miscellaneous.
                    -------------

         (a) Notices. All notices, requests, demands and other communications
             -------
provided for or permitted hereunder shall, unless otherwise stated herein, be in
writing and shall be sent by certified mail, postage prepaid and return receipt
requested, by telex, telegram or facsimile; by nationally recognized overnight
courier service; or by hand delivery to a party, in each case to such party at
its address set forth below, or at such other address as such party may
designate by written notice to the other in accordance with this provision, and
shall be deemed to have been given or made: if by certified mail, return receipt
requested, five (5) days after mailing; if by telex, telegram or facsimile,
immediately upon sending and upon confirmation of receipt; if by nationally
recognized overnight courier service with instructions to deliver the next
business day, one (1) business day after sending; and if by hand, immediately
upon personal delivery.

         (b) Amendments; Waivers. No amendment or waiver of any provision of
             -------------------
this Guarantee, nor consent to any departure by either party herefrom, shall in
any event be effective unless the same shall be in writing and signed by such
party, and then such waiver or consent shall be effective only in the specific
instance and for the specific purpose for which given.

         (c) Successors and Assigns. This Guarantee, and the terms, covenants
             ----------------------
and conditions hereof, shall be binding upon and inure to the benefit of the
parties hereto and their respective successors and assigns.

         (d) Severability. In case any provision of this Guarantee shall be
             ------------
invalid, illegal or unenforceable in any jurisdiction, the validity, legality
and enforceability of the remaining provisions shall not in any way be affected
or impaired thereby.

         (e) Waiver of Right to Trial by Jury. GUARANTOR AND LENDER HEREBY
             --------------------------------
IRREVOCABLY AND UNCONDITIONALLY WAIVE ANY AND ALL RIGHTS TO TRIAL BY JURY IN ANY
ACTION, SUIT, CLAIM, DEMAND OR CAUSE OF ACTION BY THE OTHER PARTY HERETO ARISING
UNDER, IN CONNECTION WITH OR OTHERWISE RELATING TO THIS GUARANTEE OR ANY OTHER
AGREEMENT, INSTRUMENT OR DOCUMENT EXECUTED OR DELIVERED IN CONNECTION HEREWITH,
WHETHER

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NOW EXISTING OR HEREAFTER ARISING, AND WHETHER SOUNDING IN CONTRACT OR TORT OR
OTHERWISE. GUARANTOR AND LENDER HEREBY AGREE AND CONSENT THAT ANY PARTY MAY FILE
AN ORIGINAL COUTERPART OR A COPY OF THIS GUARANTEE WITH ANY COURT AS WRITTEN
EVIDENCE OF THIS CONSENT BY BORROWER AND LENDER TO THE WAIVER OF THEIR
RESPECTIVE RIGHT TO TRIAL BY JURY.

               (f) Consent to Jurisdiction. Each of Guarantor and Lender hereby
                   -----------------------
irrevocably submits to the jurisdiction of any New York State or Federal court
sitting in the Borough of Manhattan, The City of New York, in any action or
proceeding arising out of or relating to this Guarantee, and hereby irrevocably
agrees that all claims in respect of such action or proceeding may be heard and
determined in such New York State or Federal court. Each of Guarantor and Lender
hereby irrevocably waives, to the fullest extent it may effectively do so, the
defense of an inconvenient forum to the maintenance of such action or
proceeding. Each of Guarantor and Lender also irrevocably consents to the
service of copies of the summons and complaint and any other process which may
be served in any such action or proceeding by the mailing or delivery of a copy
of such process to such party at its address for notice specified herein by
certified mail, return receipt requested. Nothing contained in this paragraph
shall affect the right of Guarantor or Lender to serve legal process in any
other manner permitted by law or to bring any action or proceeding against the
other party or its property in the courts of any other jurisdictions.

               (g) Governing Law. The validity, interpretation and enforcement
                   -------------
of this Guarantee shall be governed by the internal laws of the State of New
York (without giving effect to principles of conflicts of law).

               (h) Counterparts. This Guarantee may be executed in any number of
                   ------------
counterparts, all of which together shall constitute one and the same
instrument. Any of the parties hereto may execute this Guarantee by signing any
such counterpart.

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         IN WITNESS WHEREOF, the parties hereto have caused this Guarantee
Agreement to be duly executed as of the day and year first above written.

                                            GUARANTOR:

                                            AMPEX CORPORATION

                                            By: /s/Craig L. McKibben
                                                --------------------------------
                                                Craig L. McKibben
                                                Vice President

                                            Address:
                                            -------
                                            135 East 57th Street
                                            New York, NY 10022

                                            LENDER:

                                            SHERBORNE & COMPANY INCORPORATED

                                            By: /s/Edward J. Bramson
                                                --------------------------------
                                                Edward J. Bramson
                                                President

                                            Address:
                                            -------
                                            135 East 57th Street
                                            New York, NY 10022

                                       6<PAGE>

                                AMPEX CORPORATION
                                  500 Broadway
                             Redwood City, CA 94063

                                                                    EXHIBIT 4.10

                                                  As of October 29, 2001

Sherborne & Company Incorporated
135 East 57/th/ Street
New York, New York 10022
Attention: Mr. Edward J. Bramson

Dear Mr. Bramson:

         We refer to the Loan Agreement dated as of October 29, 2001 (the "Loan
Agreement"), between Sherborne & Company Incorporated, a Delaware corporation
("Lender") and Ampex Data Systems Corporation ("Borrower"), pursuant to which
Lender shall make secured loans to Borrower on a revolving credit basis for
working capital purposes (the "Loans") up to an aggregate amount at any one time
outstanding not in excess of $2,500,000, as set forth in the Loan Agreement.

         As a condition precedent to the making of the initial Loan under the
Loan Agreement, among other things, Ampex Corporation (the "Company") is
required to enter into an agreement with Lender providing for the issuance to
Lender or its designee of shares of the Company's Class A Common Stock, par
value $0.01 per share (the "Class A Stock").

         Accordingly, in consideration of the foregoing and for other good and
valuable consideration, the receipt and sufficiency of which are hereby mutually
acknowledged, Lender and the Company hereby agree as follows:

         1.  The Company shall issue to Lender or its designee, as promptly as
practicable following the effective date of the initial Loan made by Lender to
Borrower under the Loan Agreement (the

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Sherborne & Company Incorporated
As of October 29, 2001
Page 2

"Initial Loan Date"), One Million (1,000,000) shares of Class A Stock (the
"Shares"), shall prepare and file with the Securities and Exchange Commission
(the "SEC"), not later than December 31, 2001, a registration statement under
the Securities Act of 1933, as amended (the "Act"), covering the Shares, and
shall take all reasonable steps to cause such registration statement to become
effective with the SEC as promptly thereafter as practicable; provided, however,
                                                              --------  -------
that the Company's issuance of the Shares shall be subject to the following
conditions: (a) Lender shall have advanced to Borrower at least One Million
Dollars ($1,000,000) of Loans under the Loan Agreement; and (b) the Shares shall
have been approved for listing on the American Stock Exchange.

         2. The Company and the Lender agree that the amount of consideration
allocated to the Shares shall be deemed to be the fair market value of the
Shares on the Initial Loan Date. The fair market value of the Shares on the
Initial Loan Date shall be deemed to be equal to the closing price per share of
the Company's Class A Stock on the American Stock Exchange on the last trading
day immediately preceding the Initial Loan Date.

         3. Lender hereby represents and warrants to the Company as follows: (i)
it is acquiring the Shares for its own account and not with a view to, or
present intention of, distributing the Shares in violation of the Act or any
applicable state securities laws and will not sell or otherwise dispose of the
Shares except in compliance with the Act and such state laws, (ii) it is able to
bear the economic risks of its investment in the Shares for an indefinite period
of time, (iii) it is familiar with the business, financial and other conditions,
assets, liabilities, properties, operations, management and prospects of the
Company, (iv) it has had full access to such information concerning the Company
as it has requested and is satisfied that there is no material information
concerning the Company of which it is unaware, and (v) it has such knowledge,
skill and experience in business, financial and investment matters as to enable
it to understand and evaluate the merits and risks of an investment in the
Shares and form an investment decision with respect thereto.

         4. Unless registered under the Act, each certificate representing the
Shares shall bear the following legend:

                  "THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES
         ACT OF 1933, AS AMENDED, AND, ACCORDINGLY, MAY NOT BE OFFERED, SOLD OR
         OTHERWISE DISPOSED OF IN THE ABSENCE OF AN EFFECTIVE REGISTRATION
         STATEMENT UNDER SUCH ACT EXCEPT PURSUANT TO AN EXEMPTION FROM
         REGISTRATION UNDER SUCH ACT."

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Sherborne & Company Incorporated
As of October 29, 2001
Page 3

         5. The validity, interpretation and enforcement of this letter
agreement shall be governed by the internal laws of the State of New York
(without giving effect to principles of conflicts of law).

         6. This letter agreement may be executed in any number of counterparts,
all of which together shall constitute one and the same instrument. Any of the
parties hereto may execute this letter agreement by signing any such
counterpart.

                       [THIS PAGE INTENTIONALLY ENDS HERE]

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Sherborne & Company Incorporated
As of October 29, 2001
Page 4

         If the foregoing is acceptable to you, please so indicate by executing
this letter agreement in the space provided below and returning it to the
Company.

                                        Very truly yours,

                                        AMPEX CORPORATION

                                        By /s/Craig L. McKibben
                                           --------------------------
                                           Name:  Craig L. McKibben
                                           Title: Vice President

Agreed to and accepted
as of October 29, 2001

SHERBORNE & COMPANY INCORPORATED

By /s/Edward J. Bramson
   -----------------------------
   Name:  Edward J. Bramson
   Title: President

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