Document:

<PAGE>

                                                                 Exhibit 10.9

                      SECOND AMENDMENT TO CREDIT AGREEMENTS

                  THIS SECOND AMENDMENT TO CREDIT AGREEMENTS, dated as of April
3, 2002 (this "Amendment"), is by and among BLACK BOX CORPORATION OF
PENNSYLVANIA, a Delaware corporation (the "Borrower"), BLACK BOX CORPORATION, a
Delaware corporation (the "Parent"), the other guarantors to the Credit
Agreement and Short Term Credit Agreement (together with the Parent, the
"Guarantors"), the lenders, parties to the Credit Agreement and Short Term
Credit Agreement (the "Lenders") and MELLON BANK, N.A., a national banking
association, as agent for the Lenders (the "Agent").

                              W I T N E S S E T H:

                  WHEREAS, the Borrower, the Guarantors, the Lenders and the
Agent are parties to a Credit Agreement, dated as of April 4, 2000, and amended
by that certain First Amendment to Credit Agreements, dated as of March 30, 2001
(as amended, the "Credit Agreement"), pursuant to which the Lenders have agreed,
on the terms and subject to the conditions described therein, to make Loans to
the Borrower; and

                  WHEREAS, the Borrower, the Guarantors, the Lenders and the
Agent are parties to a Short Term Credit Agreement, dated as of April 4, 2000
and amended by that certain First Amendment to Credit Agreements, dated as of
March 30, 2001 (as amended, the "Short Term Credit Agreement" and together with
the Credit Agreement, the "Credit Agreements"), pursuant to which the Lenders
have agreed, on the terms and subject to the conditions described therein, to
make Loans to the Borrower; and

                  WHEREAS, the Borrower has requested the Lenders and the Agent
to make certain changes to the Credit Agreements and add additional Lenders (the
"New Lenders"); and

                  WHEREAS, the Lenders and the Agent are willing to amend the
Credit Agreements as set forth below; and

                  WHEREAS, capitalized terms used herein and not otherwise
defined shall have the meanings assigned to them in the Credit Agreement or the
Short Term Credit Agreement as applicable;

                  NOW, THEREFORE, in consideration of the premises and of the
mutual covenants herein contained, and intending to be legally bound hereby, the
parties hereto agree as follows:

                  SECTION 1.  Amendments to Credit Agreement. The Credit
Agreement is hereby amended as follows:

                  1.1. The definition of the term "Consolidated Fixed Charge
Coverage Ratio" appearing in Section 1.01 of the Credit Agreement is hereby
amended by deleting the words "the current maturities of long term Indebtedness
of the Parent and its Subsidiaries plus" in clause (b) of the first sentence
thereof.

                  1.2. The definition of the term "Revolving Credit Maturity
Date" appearing in Section 1.01 of the Credit Agreement is hereby amended to
read as follows:

                     "Revolving Credit Maturity Date" shall mean April 4, 2005.
<PAGE>

                  1.3. Section 2.04(a) of the Credit Agreement is amended by
deleting the third sentence in its entirety and inserting the following sentence
in lieu thereof:

                           "The aggregate number of Funding Segments applicable
         to the Euro-Rate Portion of the Loans at any time shall not exceed ten
         (10)."

                  1.4. Section 2.01(c) of the Credit Agreement is amended by
inserting the words "the date any Lender joins the Credit Agreement, or the date
on which a Lender receives a replacement Revolving Credit Note" immediately
following the clause "dated the Closing Date,".

                  1.5. Section 2.04(a)(ii) of the Credit Agreement is amended by
deleting the words "except that the Euro-Rate with respect to a two-week
Euro-Rate Funding Period shall be determined on the basis of deposits having a
maturity of one month and not two weeks" and inserting in lieu thereof the words
"except that the Euro-Rate with respect to a two-week Euro-Rate Funding Period
shall be offered only as available".

                  1.6. Section 2.04(c) of the Credit Agreement is amended by (i)
inserting the words "(as available)" in the first sentence immediately after the
words "two weeks" and (ii) inserting the words "or one year (as available)" in
the first sentence immediately after the words "or six months".

                  1.7. The Credit Agreement is amended to add Citizens Bank of
Pennsylvania and Fifth Third Bank as Lenders.

                  1.8. Annex B to the Credit Agreement is hereby replaced by
Annex B to the Credit Agreement attached hereto as Exhibit 1.

                  SECTION 2. Amendments to Short Term Credit Agreement. The
Short Term Credit Agreement is hereby amended as follows:

                  2.1. The definition of the term "Consolidated Fixed Charge
Coverage Ratio" appearing in Section 1.01 of the Short Term Credit Agreement is
hereby amended by deleting the words "the current maturities of long term
Indebtedness of the Parent and its Subsidiaries plus" in clause (b) of the first
sentence thereof.

                  2.2. The definition of the term "Revolving Credit Maturity
Date" appearing in Section 1.01 of the Short Term Credit Agreement is hereby
amended to read as follows:

                    "Revolving Credit Maturity Date" shall mean April 2, 2003.

                  2.3. Section 2.01(c) of the Short Term Credit Agreement is
amended by inserting the words "the date any Lender joins the Credit Agreement,
or the date on which a Lender receives a replacement Revolving Credit Note"
immediately following the clause "dated the Closing Date,".

                  2.4. Section 2.04(a) of the Short Term Credit Agreement is
amended by deleting the third sentence in its entirety and inserting the
following sentence in lieu thereof:

                           "The aggregate number of Funding Segments applicable
         to the Euro-Rate Portion of the Loans at any time shall not exceed ten
         (10)."
<PAGE>

                  2.5. Section 2.04(a)(ii) of the Short Term Credit Agreement is
amended by deleting the words "except that the Euro-Rate with respect to a
two-week Euro-Rate Funding Period shall be determined on the basis of deposits
having a maturity of one month and not two weeks" and inserting in lieu thereof
the words "except that the Euro-Rate with respect to a two-week Euro-Rate
Funding Period shall be offered only as available".

                  2.6. Section 2.04(c) of the Short Term Credit Agreement is
amended by inserting the words "(as available)" in the first sentence
immediately after the words "two weeks".

                  2.7. Section 2.13 of the Short Term Credit Agreement is
amended by deleting the text of such section in its entirety.

                  2.8. The Short Term Credit Agreement is amended to add
Citizens Bank of Pennsylvania and Fifth Third Bank as Lenders.

                  2.9. Annex B to the Short Term Credit Agreement is hereby
replaced by Annex B to the Credit Agreement attached hereto as Exhibit 2.

                  SECTION 3. Miscellaneous.

                  3.1. Effect of Amendment. This Amendment shall become
effective upon (a) the execution by the Borrower and the Guarantors and delivery
to the Agent of the Amendment (b) the execution by the Borrower and delivery to
the Agent of each of the Notes, dated the date of this Amendment, in the form
attached hereto as Exhibit 3, which includes substitute Notes to the Credit
Agreement and Short Term Credit Agreement for existing Lenders and new Notes to
the Credit Agreement and Short Term Credit Agreement for New Lenders, (c)
receipt by the Agent of a letter addressed to the Agent and each of the New
Lenders from counsel to each of the Loan Parties which permits each of the New
Lenders to rely on the opinions delivered on the Closing Date and (d) the
payment by the Borrower of an amendment fee equal to 0.25% multiplied by the
Commitment in the Credit Agreement of each Lender (including the New Lenders)
who approves this Amendment. Each of the Credit Agreement and the Short Term
Credit Agreement, as amended by this Amendment, is in all respects ratified,
approved and confirmed and shall, as so amended, remain in full force and
effect.

                  3.2. Surrender and Cancellation of Existing Notes. Each of
the existing Lenders shall surrender their exiting Notes and return them to the
Agent for cancellation.

                  3.3. Confirmation of Guaranty. Each of the Guarantors
reaffirms the terms and conditions of the Loan Documents executed by it and
acknowledges and agrees that such Loan Documents remain in full force and effect
and are hereby ratified, reaffirmed and confirmed.

                  3.4. Governing Law. This Amendment shall be governed by and
construed in accordance with the laws of the Commonwealth of Pennsylvania
without giving effect to the conflict of law principles thereof.

                  3.5. Counterparts. This Amendment may be executed in any
number of counterparts and by the different parties hereto on separate
counterparts, each of which, when so executed, shall be deemed an original, but
all such counterparts shall constitute but one and the same instrument.

                         [SIGNATURES BEGIN ON NEXT PAGE]
<PAGE>

                       SIGNATURE PAGE 1 OF 10 TO AMENDMENT

                  IN WITNESS WHEREOF, the parties hereto, by their officers
thereunto duly authorized, have executed and delivered this Amendment as of the
date first above written.

                                           BORROWER:

                                           BLACK BOX CORPORATION OF
                                           PENNSYLVANIA

                                           By:
                                           -------------------------------

                                           Name:
                                           -------------------------------

                                           Title:
                                           -------------------------------

                                           GUARANTORS:

                                           BLACK BOX CORPORATION and each of
                                           the DOMESTIC SUBSIDIARIES listed on
                                           Annex C attached hereto and made a
                                           part hereof

                                           By:
                                           --------------------------------

                                           Name:
                                           --------------------------------

                                           Title:
                                           --------------------------------

                                           of Black Box Corporation and of each
                                           of the Domestic Subsidiaries listed
                                           on Annex C hereto

<PAGE>

                       SIGNATURE PAGE 2 OF 10 TO AMENDMENT

                                            AGENT:

                                            MELLON BANK, N.A.

                                            By:
                                              -------------------------------

                                            Name:
                                              -------------------------------

                                            Title:
                                              -------------------------------

                                             BANKS:

                                             MELLON BANK, N.A.

                                             By:
                                              -------------------------------

                                             Name:
                                              -------------------------------

                                             Title:
                                              -------------------------------

<PAGE>

                       SIGNATURE PAGE 3 OF 10 TO AMENDMENT

                                             FIRST UNION NATIONAL BANK

                                             By:
                                              -------------------------------

                                             Name:
                                              -------------------------------

                                             Title:
                                              -------------------------------

<PAGE>

                       SIGNATURE PAGE 4 OF 10 TO AMENDMENT

                                             FLEET NATIONAL BANK

                                             By:
                                              -------------------------------

                                             Name:
                                              -------------------------------

                                             Title:
                                              -------------------------------

<PAGE>

                       SIGNATURE PAGE 5 OF 10 TO AMENDMENT

                                             NATIONAL CITY BANK OF PENNSYLVANIA

                                             By:
                                              -------------------------------

                                             Name:
                                              -------------------------------

                                             Title:
                                              -------------------------------

<PAGE>

                       SIGNATURE PAGE 6 OF 10 TO AMENDMENT

                                             COMERICA BANK

                                             By:
                                              -------------------------------

                                             Name:
                                              -------------------------------

                                             Title:
                                              -------------------------------

<PAGE>

                       SIGNATURE PAGE 7 OF 10 TO AMENDMENT

                                             FIRSTAR BANK, N.A.

                                             By:
                                              -------------------------------

                                             Name:
                                              -------------------------------

                                             Title:
                                              -------------------------------

<PAGE>

                       SIGNATURE PAGE 8 OF 10 TO AMENDMENT

                                             KEYBANK NATIONAL ASSOCIATION

                                             By:
                                              -------------------------------

                                             Name:
                                              -------------------------------

                                             Title:
                                              -------------------------------

<PAGE>

                       SIGNATURE PAGE 9 OF 10 TO AMENDMENT

                                             CITIZENS BANK OF PENNSYLVANIA

                                             By:
                                              -------------------------------

                                             Name:
                                              -------------------------------

                                             Title:
                                              -------------------------------

<PAGE>

                      SIGNATURE PAGE 10 OF 10 TO AMENDMENT

                                             FIFTH THIRD BANK

                                             By:
                                              -------------------------------

                                             Name:
                                              -------------------------------

                                             Title:
                                              -------------------------------

<PAGE>

                                    EXHIBIT 1

                           ANNEX B To Credit Agreement

                               COMMITMENT SCHEDULE

-------------------------------------------------------------------------------
BANK                                                COMMITMENT
-------------------------------------------------------------------------------
Mellon Bank, N.A.                                   $18,000,000.00
-------------------------------------------------------------------------------
First Union National Bank                           $16,000,000.00
-------------------------------------------------------------------------------
Fleet National Bank                                 $16,000,000.00
-------------------------------------------------------------------------------
National City Bank of Pennsylvania                  $16,000,000.00
-------------------------------------------------------------------------------
Comerica Bank                                       $12,000,000.00
-------------------------------------------------------------------------------
Firstar Bank, N.A.                                  $12,000,000.00
-------------------------------------------------------------------------------
KeyBank National Association                        $10,000,000.00
-------------------------------------------------------------------------------
Citizens Bank of Pennsylvania                       $10,000,000.00
-------------------------------------------------------------------------------
Fifth Third Bank                                    $10,000,000.00
-------------------------------------------------------------------------------

<PAGE>

                                    EXHIBIT 2

                           ANNEX B To Credit Agreement

                               COMMITMENT SCHEDULE

                          [Short Term Credit Agreement]

-------------------------------------------------------------------------------
BANK                                                COMMITMENT
-------------------------------------------------------------------------------
Mellon Bank, N.A.                                   $9,000,000.00
-------------------------------------------------------------------------------
First Union National Bank                           $8,000,000.00
-------------------------------------------------------------------------------
Fleet National Bank                                 $8,000,000.00
-------------------------------------------------------------------------------
National City Bank of Pennsylvania                  $8,000,000.00
-------------------------------------------------------------------------------
Comerica Bank                                       $6,000,000.00
-------------------------------------------------------------------------------
Firstar Bank, N.A.                                  $6,000,000.00
-------------------------------------------------------------------------------
KeyBank National Association                        $5,000,000.00
-------------------------------------------------------------------------------
Citizens Bank of Pennsylvania                       $5,000,000.00
-------------------------------------------------------------------------------
Fifth Third Bank                                    $5,000,000.00
-------------------------------------------------------------------------------<PAGE>

EXHIBIT 10.65

                       FIFTH AMENDMENT TO CREDIT AGREEMENT

         FIFTH AMENDMENT TO CREDIT AGREEMENT, dated as of May 3, 2002 (the
"Amendment"), among EAGLE-PICHER INDUSTRIES, INC., a Delaware corporation and
successor by merger to E-P ACQUISITION, INC., a Delaware corporation (together
herein collectively referred to as the "Borrower"), the lenders party hereto
(each a "Lender" and collectively, the "Lenders"), ABN AMRO BANK N.V., as Agent
(in such capacity, the "Agent") and PNC BANK, NATIONAL ASSOCIATION, as
Documentation Agent (in such capacity, the "Documentation Agent").

                              W I T N E S S E T H:

         WHEREAS, the Borrower, the Lenders, the Agent, and the Documentation
Agent are parties to that certain Credit Agreement, dated as of February 19,
1998, as modified by (i) that certain Eagle-Picher Industries, Inc. Credit
Agreement Consent and Waiver among the Borrower, the Agent and the Lenders party
thereto, dated as of November 18, 1998, (ii) that certain Eagle-Picher
Industries, Inc. Credit Agreement Amendment and Consent among the Borrower, the
Agent and the Lenders party thereto, dated as of December 14, 1998, (iii) that
certain Amendment to Credit Agreement and Consent among the Borrower, the Agent
and the Lenders party thereto, dated as of May 18, 1999, (iv) that certain
Credit Agreement Consent among the Borrower, the Agent and the Lenders party
thereto, dated as of May 26, 2000, (v) that certain Amendment to Credit
Agreement and Consent among the Borrower, the Agent and the Lenders party
thereto, dated as of August 1, 2000 and (vi) that certain Fourth Amendment to
Credit Agreement and Consent among the Borrower, the Agent and the Lenders party
thereto, dated as of May 31, 2001 (together, the "Credit Agreement"); and

         WHEREAS, the Borrower has requested that the Leverage Ratio as set
forth in the Credit Agreement be further amended in certain respects; and

         WHEREAS, the Lenders and the Agents party hereto, are willing to so
further amend the Credit Agreement, subject to the terms and conditions
hereinafter set forth;

         NOW, THEREFORE, the parties hereto, in consideration of their mutual
covenants and agreements hereinafter set forth and intending to be legally bound
thereby, covenant and agree as follows:

         1. General. All terms used herein which are not otherwise specifically
defined herein shall have the same meaning herein as defined in the Credit
Agreement as further amended hereby.

<PAGE>

         2. Leverage Ratio. Section 8.09 of the Credit Agreement shall be and is
hereby amended by deleting the table set forth therein and inserting the
following table in its place:

                            "PERIOD                         RATIO
                     May 31, 2001                         5.00:1.00
                     August 31, 2001                      5.25:1.00
                     November 30, 2001                    5.25:1.00
                     February 28, 2002                    5.25:1.00
                     May 31, 2002                         5.25:1.00
                     August 31, 2002                      5.00:1.00
                     November 30, 2002                    4.75:1.00
                     February 28, 2003                    4.75:1.00
                     May 31, 2003                         4.50:1.00
                     Thereafter                           4.25:1.00"

          3. Effectiveness. This Amendment shall become effective as of the date
hereof on the condition that the Borrower and the Required Lenders shall have
signed a counterpart hereof and shall have delivered the same to the Agent (the
"Effective Condition"). Upon the satisfaction of the Effective Condition, the
Borrower agrees to pay to each Lender who executes this Amendment on or before
the date hereof an amendment fee equal to 0.125% of such Lender's respective
Commitment as of the date hereof, and such Lenders agree that such fee shall not
be included in Consolidated Interest Expense. This Amendment may be executed in
any number of counterparts and by the different parties hereto on separate
counterparts, each of which when so executed and delivered shall be an original,
but all of which shall together constitute one and the same instrument. A set of
counterparts executed by all the parties hereto shall be lodged with the
Borrower and the Agent. This Amendment and the rights and obligations of the
parties hereunder shall be construed in accordance with and be governed by the
law of the State of New York. Except as herein specifically amended, the Credit
Agreement shall be and remain in full force and effect and wherever reference is
made in any note, document, letter or other communication to the Credit
Agreement, such reference shall, without more, be deemed to refer to the Credit
Agreement as amended hereby. The amendment provided for herein shall be limited
specifically as provided for herein and this Amendment shall not constitute a
waiver or modification of any other term, provision or condition of the Credit
Agreement except as expressly set forth herein and shall not prejudice or be
deemed to prejudice any right that the Agent or the Lenders may now have or may
have in the future under the Credit Agreement.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                      - 2 -
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused their duly
authorized officers to execute and deliver this Amendment as of the date first
above written.

                                  EAGLE-PICHER INDUSTRIES, INC.

                                  By __________________________________________
                                     Name:_____________________________________
                                     Title:____________________________________

                                  ABN AMRO BANK N.V., individually and as Agent

                                  By __________________________________________
                                     Name:_____________________________________
                                     Title:____________________________________

                                  By __________________________________________
                                     Name:_____________________________________
                                     Title:____________________________________

                                  PNC BANK, NATIONAL ASSOCIATION

                                  By __________________________________________
                                     Name:_____________________________________
                                     Title:____________________________________

                                  FIRSTAR BANK, N.A.

                                  By __________________________________________
                                     Name:_____________________________________
                                     Title:____________________________________

                                  ARAB BANKING CORPORATION

                                  By __________________________________________
                                     Name:_____________________________________
                                     Title:____________________________________

                                     - 3 -
<PAGE>

                                  THE BANK OF NOVA SCOTIA

                                  By __________________________________________
                                     Name:_____________________________________
                                     Title:____________________________________

                                  BANK OF TOKYO-MITSUBISHI TRUST COMPANY

                                  By __________________________________________
                                     Name:_____________________________________
                                     Title:____________________________________

                                  CREDIT AGRICOLE INDOSUEZ

                                  By __________________________________________
                                     Name:_____________________________________
                                     Title:____________________________________

                                  BANK ONE, INDIANA, N.A., formerly known as
                                  NBD Bank, N.A.

                                  By __________________________________________
                                     Name:_____________________________________
                                     Title:____________________________________

                                  CREDITANSTALT CORPORATE FINANCE

                                  By __________________________________________
                                     Name:_____________________________________
                                     Title:____________________________________

                                  By __________________________________________
                                     Name:_____________________________________
                                     Title:____________________________________

                                     - 4 -
<PAGE>

                                  PROVIDENT BANK

                                  By ________________________________________
                                     Name:___________________________________
                                     Title:__________________________________

                                  FIFTH THIRD BANK

                                  By ________________________________________
                                     Name:___________________________________
                                     Title:__________________________________

                                  THE BANK OF NEW YORK

                                  By _______________________________________
                                     Name:__________________________________
                                     Title:_________________________________

                                  CREDIT INDUSTRIAL ET COMMERCIAL,
                                    formerly known as Compagnie Financiere de
                                    CIC et de l'Union Europeenne

                                  By _______________________________________
                                     Name:__________________________________
                                     Title:_________________________________

                                  COMERICA BANK

                                  By _______________________________________
                                     Name:__________________________________
                                     Title:_________________________________

                                  IMPERIAL BANK

                                  By _______________________________________
                                     Name:__________________________________
                                     Title:_________________________________

                                     - 5 -
<PAGE>

                                  THE MITSUBISHI TRUST AND BANKING
                                     CORPORATION

                                  By _________________________________________
                                     Name:____________________________________
                                     Title:___________________________________

                                  HARRIS TRUST AND SAVINGS BANK

                                  By _________________________________________
                                     Name:____________________________________
                                     Title:___________________________________

                                  CREDIT SUISSE FIRST BOSTON

                                  By _________________________________________
                                     Name:____________________________________
                                     Title:___________________________________

                                  By _________________________________________
                                     Name:____________________________________
                                     Title:___________________________________

                                  TRANSAMERICA BUSINESS CAPITAL
                                     CORPORATION (as successor in interest to
                                     Transamerica Business Credit Corporation)

                                  By _________________________________________
                                     Name:____________________________________
                                     Title:___________________________________

                                  By _________________________________________
                                     Name:____________________________________
                                     Title:___________________________________

                                  MIZUHO CORPORATE BANKING, LTD., formerly
                                     known as The Fuji Bank, Limited

                                  By _________________________________________
                                     Name:____________________________________
                                     Title:___________________________________

                                     - 6 -

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