Document:

<PAGE>

                                                                 EXHIBIT 10.(OO)

      SECOND AMENDMENT AND WAIVER TO AMENDED AND RESTATED CREDIT AGREEMENT

            THIS SECOND AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT (this
"AMENDMENT") made and entered into as of May 29, 2004 (the "EFFECTIVE DATE"), by
and among LYNCH SYSTEMS, INC., a South Dakota corporation (the "BORROWER"), and
SUNTRUST BANK, a Georgia banking corporation (the "LENDER").

                              W I T N E S S E T H:

      WHEREAS, the Borrower and the Lender are parties to a certain Amended and
Restated Credit Agreement, dated as of June 10, 2002, as amended by that certain
First Amendment to Amended and Restated Credit Agreement, dated as of May 30,
2003 (as the same may be further amended from time to time, the "CREDIT
AGREEMENT"; capitalized terms used herein and not otherwise defined herein shall
have the meanings given such terms in the Credit Agreement as amended by this
Amendment), whereby the Lender has agreed to make certain loans to the Borrower,
subject to the terms, covenants and conditions contained in the Credit
Agreement; and

      WHEREAS, the Borrower has requested that the Lender amend the Credit
Agreement as set forth in this Amendment, and the Lender is willing to agree to
such modifications subject to the terms and conditions of this Amendment.

      NOW THEREFORE, in consideration of the premises and mutual covenants
contained herein, and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

      1. RESERVED.

      2. AMENDMENTS TO CREDIT AGREEMENT. Subject to the terms and conditions of
this Amendment, the Credit Agreement is hereby amended as follows:

      (a) by deleting the definition of the term "Maturity Date" from Section
1.01 thereof, and by substituting, in lieu thereof, the following new definition
of such term:

            "Maturity Date" shall mean May 31, 2005, as such date may be
            extended, accelerated or amended from time to time pursuant to this
            Agreement.

      (b) by deleting the language "Two Million Dollars ($2,000,000)" from
      Section 2.01(a)(i) thereof, and by substituting, in lieu thereof, the
      following new language: "Four Million Dollars ($4,000,000)."

      3. NO OTHER WAIVERS OR AMENDMENTS; CONDITIONS SUBSEQUENT. Except for the
amendment expressly set forth and referred to in Section 2 above, the Credit
Agreement shall remain unchanged and in full force and effect. Nothing in this
Amendment is intended, or shall be construed, to constitute a novation or an
accord and satisfaction of any of the Borrower's Obligations under or in
connection with the Credit Agreement or to modify, affect or impair the

                                       1
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perfection or continuity of Lender's security interests in, security titles to
or other liens on any Collateral for the Obligations.

      4. CONDITIONS TO EFFECTIVENESS. This Amendment shall become effective,
upon the Effective Date, subject to the satisfaction of the following conditions
on or prior to such date:

                  (1) the receipt by the Lender of this Amendment, duly
            executed, completed and delivered by the Lender and the Borrower;

                  (2) the receipt by the Lender of the fully-executed promissory
            note, in the form of Exhibit A attached hereto (the "NEW NOTE"), to
            replace the promissory note previously delivered under the Credit
            Agreement;

                  (3) the receipt by Lender of a non-refundable extension fee in
            the amount of $8,750 (representing 0.125% of the Non-Guaranteed Loan
            Maximum Availability), which extension fee shall be deemed fully
            earned upon the parties' execution and delivery of this Amendment;
            and

                  (4) the receipt by the Lender of such other documents,
            certificates, lien searches and instruments as the Lender may
            reasonably request.

      5. REPRESENTATIONS AND WARRANTIES. The Borrower hereby represents and
warrants to the Lender that (a) this Amendment and the New Note have been duly
authorized, executed and delivered by it, (b) no Default or Event of Default has
occurred and is continuing as of this date after giving effect to the waiver
granted in Section 1 hereof, and (c) all of the representations and warranties
made by it in the Credit Agreement are true and correct in all material respects
on and as of the date of this Amendment (except to the extent that any such
representations or warranties expressly referred to a specific prior date). Any
breach the Borrower of its representations and warranties contained in this
Section 5 shall be an Event of Default for all purposes of the Credit Agreement.

      6. RATIFICATION. The Borrower hereby ratifies and reaffirms each and every
term, covenant and condition set forth in the Credit Agreement and all other
documents delivered by the Borrower in connection therewith (including without
limitation the other Credit Documents to which the Borrower is a party),
effective as of the date hereof.

      7. ESTOPPEL. To induce the Lender to enter into this Amendment, the
Borrower hereby acknowledges and agrees that, as of the date hereof, there
exists no right of offset, defense or counterclaim in favor of the Borrower as
against the Lender with respect to the obligations of the Borrower to the Lender
under the Credit Agreement or the other Credit Documents, either with or without
giving effect to this Amendment.

      8. REIMBURSEMENT OF EXPENSES. The Borrower hereby agrees that it shall
reimburse the Lender on demand for all costs and expenses (including without
limitation reasonable attorney's fees) actually incurred by such parties in
connection with the negotiation, documentation and consummation of this
Amendment and the other documents executed in connection herewith and therewith
and the transactions contemplated hereby and thereby.

                                       2
<PAGE>

      9. GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF GEORGIA FOR CONTRACTS TO BE PERFORMED
ENTIRELY WITHIN SAID STATE.

      10. SEVERABILITY OF PROVISIONS. Any provision of this Amendment which is
prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction,
be ineffective to the extent of such prohibition or unenforceability without
invalidating the remaining provisions hereof or affecting the validity or
enforceability of such provision in any other jurisdiction. To the extent
permitted by applicable law, the Borrower hereby waives any provision of law
that renders any provision hereof prohibited or unenforceable in any respect.

      11. COUNTERPARTS. This Amendment may be executed in any number of
counterparts, all of which shall be deemed to constitute but one original and
shall be binding upon all parties, their successors and permitted assigns.

      12. ENTIRE AGREEMENT. The Credit Agreement as amended by this Agreement
embodies the entire agreement between the parties hereto relating to the subject
matter hereof and supersedes all prior agreements, representations and
understandings, if any, relating to the subject matter hereof.

                  [remainder of page intentionally left blank]

                                       3
<PAGE>

            IN WITNESS WHEREOF, the parties hereto have caused this Amendment to
be duly executed and delivered on their behalf and the Borrower has caused its
corporate seal to be hereunto affixed, all as of the date first above stated.

                                             BORROWER:
(CORPORATE SEAL)
                                             LYNCH SYSTEMS, INC.
Attest:
                                             By: /s/ A. BOWLING
                                                 -------------------------------
/s/ JANET T. GRIMSLEY                         Title: President
-----------------------------------
Title: Secretary

                                             LENDER:

                                             SUNTRUST BANK

                                             By:/S/ CATHERINE M. MATHIS
                                                --------------------------------
                                              Title: Group Vice President

                                       4
<PAGE>

                  PARENT GUARANTOR ACKNOWLEDGMENT AND CONSENT

      The undersigned hereby acknowledges and consents to, and agree to the
terms of, the foregoing Second Amendment to Amended and Restated Credit
Agreement, and ratifies and confirms its obligations under the Parent Guaranty
(as defined in the Amended and Restated Credit Agreement).

      This 29th day of May, 2004.

LYNCH CORPORATION

By: /s/ Raymond H. Keller
    ------------------------------------
Name: Raymond H. Keller
Title: VP/CFO

                                       5
<PAGE>

                                   EXHIBIT A

                            FORM OF PROMISSORY NOTE

                                PROMISSORY NOTE

U.S. $7,000,000                                                     MAY 29, 2004

FOR VALUE RECEIVED, the undersigned LYNCH SYSTEMS, INC., a South Dakota
corporation (the "Borrower"), hereby promises to pay to the order of SUNTRUST
BANK (herein, together with any subsequent holder hereof, called the "Lender"),
the lesser of SEVEN MILLION AND NO/100 U.S. DOLLARS (U.S. $7,000,000.00) or the
aggregate outstanding principal amount of the Loans made to the Borrower by
Lender pursuant to the terms of the Credit Agreement referred to below, which
principal sum shall be payable on the earlier of (i) the Maturity Date specified
in the Credit Agreement or (ii) the date on which all amounts outstanding under
this Promissory Note (this "Note") have become due and payable pursuant to the
provisions of Article IX of the Credit Agreement (as defined below). The
Borrower likewise promises to pay interest on the outstanding principal balance
of each Loan made by the Lender to the Borrower, at such interest rates, payable
at such times, and computed in such manner, as are specified in the Credit
Agreement in strict accordance with the terms thereof.

            This Note is issued pursuant to, and is the "Note" referred to in,
the Amended and Restated Credit Agreement dated as of June 10, 2002, between
Borrower and Lender, as amended by that certain First Amendment to Amended and
Restated Credit Agreement dated as of May 30, 2003, and as amended by that
certain Second Amendment to Amended and Restated Credit Agreement dated as the
date hereof (as the same may be further amended, modified or replaced from time
to time, the "Credit Agreement"), and the Lender is and shall be entitled to all
benefits thereof and of all the Credit Documents executed and delivered to the
Lender in connection therewith. Terms defined in the Credit Agreement are used
herein with the same meaning. The Credit Agreement, among other things, contains
provisions for acceleration of the maturity hereof upon the happening of certain
Events of Default, provisions relating to prepayments on account of principal
hereof prior to the maturity hereof, and provisions for post-default interest
rates.

            This Note is issued in replacement of and substitution for that
certain Promissory Note, dated as of May 30, 2003, issued by the Borrower in
favor of the Lender (the "PRIOR NOTE"). This Note is not intended nor shall it
be construed as a novation or an accord and satisfaction of the indebtedness
evidenced by the Prior Note.

            The Borrower agrees to make payments of principal and interest
hereon on the dates and in the amounts specified in the Credit Agreement in
strict accordance with the terms thereof.

            In case an Event of Default shall occur and be continuing, the
principal and all accrued interest of this Note may automatically become, or may
be declared, immediately due

                                       6
<PAGE>

and payable in the manner and with the effect provided in the Credit Agreement.
The Borrower agrees to pay, and save the Lender harmless against any liability
for the payment of, all costs and expenses, including reasonable attorneys'
fees, in connection with the enforcement by the Lender of any of its rights or
remedies under this Note or the Credit Agreement.

            This Note has been delivered in Atlanta, Georgia, and the rights and
obligations of the Lender and the Borrower hereunder shall be construed in
accordance with and governed by the laws of the State of Georgia (without giving
effect to its conflicts of law rules).

            The Borrower expressly waives any presentment, demand, protest or
notice in connection with this Note, whether now or hereafter required by
applicable law. This Note is intended to be an instrument under seal.

            IN WITNESS WHEREOF, the Borrower has caused this Note to be
executed, sealed and delivered by its duly authorized officers as of the date
first above written.

(CORPORATE SEAL)                             LYNCH SYSTEMS, INC.

                                             By: /s/ A. Bowling
                                                 -------------------------------
                                             Title: President

Attest:

/s/ JANET T. GRIMSLEY
------------------------------------
Secretary

                                       7<PAGE>
                                                                               .
                                                                               .
                                                                               .

                                                                EXHIBIT 10. (pp)

[FIRST NATIONAL BANK LOGO]

<TABLE>
<CAPTION>
<S>                <C>                          <C>                <C>                  <C>
  LOAN NUMBER          LOAN NAME                ACCT, NUMBER         NOTE DATE            INITIALS
 2000001751/6       M-Tron Industries, Inc.
 Renewal Plus        INDEX (w/Margin)                                06/14/04               JRK
  NOTE AMOUNT      FNBO National                    RATE           MATURITY DATE        LOAN PURPOSE
$1, 200,000, 00    Base Rate plus 0.500%            4.5%             04/30/07            Commercial

                                          Creditor Use Only
</TABLE>

                                 PROMISSORY NOTE
                        (Commercial-Draw-Variable Rate)

DATE AND PARTIES. The date of this Promissory Note (Note) is May 14, 2004. The
parties and their addresses are:

    LENDER:
        FIRST NATIONAL BANK OF OMAHA
        STOP CODE 1030
        1620 Dodge St
        Omaha, Nebraska 68197
        Telephone: (402) 633-3555

    BORROWER:
        M-TRON INDUSTRIES, INC.
        a Delaware Corporation
        100 Douglas Avenue
        Yankton, South Dakota 57078

1.    DEFINITIONS. As used in this Note, the terms have the following meanings;

      A. PRONOUNS. The pronouns "I," "me," and "my" refer to each Borrower
      signing this Note, individually end together with their heirs, successors
      and assigns, and each other person of legal entity (including guarantors,
      endorsers, end sureties) who agrees to pay this Note. "You" and "Your"
      refer to the Lender, with its participants or syndicators, successors and
      assigns, or any person or company that acquires an interest in the Loan.

      B. NOTE. Note refers to this document, and any extensions, renewals,
      modifications and substitutions of this Note.

      C. LOAN. Loan refers to this transaction generally, including obligations
      and duties arising from the terms of all documents prepared or submitted
      for this transaction such as applications, security agreements,
      disclosures or notes, and this Note.

      D. PROPERTY. Property is any property, real, personal or intangible, that
      secures my performance of the obligations of this Loan,

      E. PERCENT. Rates and rate change limitations are expressed as annualized
      percentages.

2. PROMISE TO PAY. For value received I promise to pay you or your order, at
your address, or at such other location as you may designate, amount advanced
from time to time under the terms of this Note up to the maximum total principal
balance of $1,200,000.00 [Principal]. plus interest from the data of
disbursement, on the unpaid outstanding Principal balance until this Note
matures or this obligation is accelerated.

3.    ADVANCES. Advances under this Note are made according to the following
      terms and conditions.

      A. REQUESTS FOR ADVANCES. My requests are a warranty that I am in
      compliance with all the Loan documents. When required by you for a
      particular method of advance, my requests for an advance must specify the
      requested amount and the date and be accompanied with any agreements,
      documents, and instruments that you require for the Loan. Any payment by
      you of any check, share draft or other charge may, at your option,
      constitute an advance on the Loan to me. All advances will be made in
      United States dollars. I will indemnity you and hold you harmless for your
      reliance on any request for advances that you reasonably believe to be
      genuine. To the extent permitted by law, I will indemnify you and hold you
      harmless when the person making any request represents that I authorized
      this person to request an advance even when this person is unauthorized or
      this person's signature is not genuine.

      I or anyone I authorize to act on my behalf may request advances by the
      following methods.

            (1) I make a request in person.

            (2) I make a request by phone.

            (3) I make a request by mail.

            (4) I write a check or share draft.

      B. ADVANCE LIMITATIONS. In addition to any other Loan conditions, requests
      for, and access to, advances are subject to the following limitations.

            (1) OBLIGATORY ADVANCES. You will make all Loan advances subject to
            this Agreement's terms and conditions. :

            (2) ADVANCE AMOUNT. Subject to the terms and conditions contained in
            this Note, advances will be made in exactly the amount I request.

            (3) DISBURSEMENT OF ADVANCES. On my fulfilment of this Note's terms
            and conditions, you will disburse the advance in any manner as you
            and I agree.

            (4) CREDIT LIMIT. I understand that you will not ordinarily grant a
            request for an advance that would cause the unpaid principal of my
            Loan to be greater than the Principal limit. You may, at your
            option, grant such a request without obligating yourselves to do so
            in the future.

            (5) RECORDS. Your records will be conclusive evidence as to the
            amount of advances, the Loan's unpaid principal balances and the
            accrued interest.

4. INTEREST. interest will accrue on the unpaid Principal balance of this Note
at the rate of 4.5 percent (Interest Rate) until May 15, 2004. after which time
it may change as described in the Variable Rate subsection.

      A. INTEREST AFTER DEFAULT. If you declare a default under the terms of
      this Loan, including for failure to pay in full at maturity, you may
      increase the Interest Rate payable on the outstanding Principal balance of
      this Note. In such event, interest win accrue on the outstanding Principal
      balance at the variable Interest Rate in effect from time to time, plus an
      additional 6.000 percent, until paid in full.

      B. MAXIMUM INTEREST AMOUNT. Any amount assessed or collected as interest
      under the terms of this Note or obligation will be limited to the Maximum
      Lawful Amount of interest allowed by state or federal law. Amounts
      collected in excess of the Maximum Lawful Amount will be applied first to
      the unpaid Principal balance. Any remainder will be refunded to me,

<TABLE>
<S>                                   <C>                                                          <C>
M-Tron Industries, Inc.
Nebraska Promissory Note                                                                   Initials______
NE/4XX27073500725200004364003051404N  (c)(1996) Bankers Systems, Inc., St. Cloud, MN [ILLEGIBLE]   Page 1
</TABLE>
<PAGE>

      C. STATUTORY AUTHORITY. The amount assessed or collected on this Note is
      authorized by the Nebraska usury laws under Neb, Rev. Stot. ! 45.101.03.

      D. ACCRUAL. During the scheduled term of this Loan Interest accrues using
      an Actual/360 days counting method.

      E. VARIABLE RATE. The Interest Rate may change during the term of this
      transaction.

            (1) INDEX. Beginning with the first Change Date, the Interest Rate
            will be based on the following index: the base rate in effect from
            time to time and designated by First National Bank of Omaha
            [ILLEGIBLE] its National Base Rate.

            The Current Index is the most recent index figure available on each
            Change Date. You do not guaranty by selecting this Index, or the
            margin, that the Interest Rate on this Note will be the same rate
            you charge on any other loans or class of loans you make to me or
            other borrowers. If this Index is no longer available, you will
            substitute a similar index. Yog will give me notice of your choice.

            (2) CHANGE DATE. Each date on which the Interest Rate may change is
            called a Change Date. The Interest Rate may change May 15, 2004 and
            daily thereafter.

            (3) CALCULATION OF CHANGE. On each Change Date, you will calculate
            the Interest Rate, which will be the Current Index plus 0.500
            percent. The result of this calculation will be rounded to the
            nearest .001 percent. Subject to any limitations, this will be the
            Interest Rate until the next Change Date. The new Interest Rate will
            become effective on each Change Date. The Interest Rate and other
            charges on this Note will never exceed the highest rate or charge
            allowed by law for this Note.

            (4) LIMITATIONS. The Interest Rate change* era subject to the
            following limitations.

            (a) LIFETIME. The Interest Rate will never be less than 4.500
            percent.

            5. EFFECT OF VARIABLE RATE. A change in the Interest Rate will have
            the following effect on the payments: The amount of the final
            payment will change.

5. PAYMENT. I agree to pay this Note as follows: I agree to pay this Note in 36
payments. This Note is amortized over 60 payments. A payment of 422,369.76 will
be due May 31, 2004, and on the last day of each month thereafter. A final
payment of the entire unpaid balance of Principal and interest will be due April
30, 2007. Any changes in the Interest Rate will affect the amount of this
payment.

Payment will be rounded to the nearest 4.01. With the final payment I
also agree to pay any additional fees or charges owing and the amount of any
advances you have made to others on my behalf. Payments scheduled to be paid on
the 29th, 30th or 3lst day of a month that contains no such day will, instead,
be made on the last day of such month.

Each payment I make on this Note will be applied first to interest that is due
then to principal that is due, and finally to any charges that I owe other than
principal and interest. If you and I agree to a different application of
payments, we will describe our agreement on this Note. The actual amount of my
final payment will depend on my payment record,

6. PREPAYMENT. I may prepay this Loan in full or in part at any time. Any
partial prepayment will not excuse any later scheduled payments until I pay in
full.

7. LOAN PURPOSE. The purpose of this Loan is to fund the purchase of new and
used equipment.

8. SECURITY. This Loan is secured by the following, previously executed,
security instruments or agreements: Restated Loan/Security Agreement dated
August 31, 2001. Letter of Credit IRS1351047 issued by Fleet National Bank on
behalf of Lynch Corporation in the amount of $ 1,000,000.00 dated September 9,
2002.

9. DEFAULT. I will be in default if any of the following occur:

      A. PAYMENT. I fail to make a payment in full when due.

      B. INSOLVENCY OR BANKRUPTCY. I make an assignment for the benefit of
      creditors or become insolvent, either because my liabilities exceed my
      assets or I am unable to pay my debts as they become due; or I petition
      for protection under federal, state or local bankruptcy, insolvency or
      debtor relief laws, or am the subject of a petition or action under such
      laws and fail to have the petition or action dismissed within a reasonable
      period of time not to exceed 60 days.

      C. BUSINESS TERMINATION. I merge, dissolve, reorganize, end my business or
      existence, or a partner or majority owner dies or is declared legally
      incompetent.

      D. FAILURE TO PERFORM. I fail to perform any condition or to keep any
      promise or covenant of this Note.

      E. OTHER DOCUMENTS. A default occurs under the terms of any other
      transaction document.

      F. OTHER AGREEMENTS. I am in default on any other debt or agreement I have
      with you.

      G. MISREPRESENTATION. I make any verbal or written statement or provide
      any financial information that is untrue, inaccurate, or conceals a
      material fact at the time it is made or provided.

      H. JUDGMENT. I fail to satisfy or appeal any judgment against me.

      I. [ILLEGIBLE] The Property is used in a manner or for a purpose that
      threatens confiscation by a legal authority.

      J. NAME CHANGE. I change my name or assume an additional name without
      notifying you before making such a change.

      K. PROPERTY TRANSFER. I transfer all or a substantial part of my money or
      property.

      L. PROPERTY VALUE. The value of the Property declines or is impaired.

      M. MATERIAL CHANGE. Without first notifying you, there is a material
      change in my business, including ownership, management, and financial
      conditions.

      N. INSECURITY. You reasonably believe that you are insecure.

10. ASSUMPTIONS. Someone buying the Property cannot assume the obligation. You
may declare the entire balance of the Note to be immediately due and payable
upon the creation of, or contract for the creation of, any lien, encumbrance, or
transfer of the Property.

11. WAIVERS AND CONSENT. To the extent not prohibited by law, I waive protest,
presentment for payment, demand, notice of acceleration, notice of intent to
accelerate and notice of dishonor.

      A. Additional Waivers By Borrower. In addition, I, and any party to this
      Note and Loan, to the extent permitted by law. consent to certain actions
      you may take, and generally waive defenses that may be available based on
      these actions or based on the status of a party to this Note.

            (1) You may renew or extend payments on this Note, regardless of the
            number of such renewals or extensions.

            (2) You may release any Borrower, endorser, guarantor, surety,
            accommodation maker or any other co-signer.

            (3) You may release, substitute or impair any Property securing this
            Note.

            (4) You, or any institution participating in this Note, may invoke
            your right of set-off.

            (5) You may enter into any sales, repurchases or participations of
            this Note to any person in any amounts and I waive notice of such
            sales, repurchases or participations.

            (6) I agree that any of us signing this Note as a Borrower is
            authorized to modify the terms of this Note or any instrument
            securing, guarantying or relating to this Note.

      B. NO WAIVER BY LENDER. Your course of dealing, or your forbearance from,
      or delay in, the exercise of any of your rights, remedies, prevelages or
      right to insist upon my strict performance of any provisions contained in
      this Note, or other Loan documents, shall not be construed as a waiver by
      you, unless any such waiver is in writing and is signed by you.

12. REMEDIES. After I default, and after you give any legally required notice
and opportunity to cure the default, you may at your option do any one or more
of the following.

      A. Acceleration. You may make all or any part of the amount owing by the
      terms of this Note immediately due.

      B. Sources. You may use any and all remedies you have under state or
      federal law or in any instrument securing this Note.

<TABLE>
<S>                                   <C>                                                         <C>
M-Tron Industries, Inc.
Nebraska Promissory Note                                                                    Initials___
NE/4XX27073500725200004364003051404N  (c)1996, Bankers Systems, Inc., St. Cloud, MN [ILLEGIBLE]   Page 2
</TABLE>

<PAGE>

      C. INSURANCE BENEFITS. You may make a claim for any and all insurance
      benefits or refunds that may be available on my default.

      D. PAYMENTS MADE ON MY BEHALF. Amounts advanced on my behalf will be
      immediately due and may be added to the balance owing under the terms of
      this Note, and accrue interest at the highest post-maturity interest rate.

      E. TERMINATION. You may terminate my right to obtain advances and may
      refuse to make any further extensions of credit.

      F. SET-OFF. You may use the right of set-off. This means you may set-off
      any amount due and payable under the terms of this Note against any right
      I have to receive money from you.

      My right receive money from you includes any deposit or share account
      balance I have with you; any money owed to me on an item presented to you
      or in your possession for collection or exchange; and any repurchase
      agreement or other non-deposit obligation. "Any amount due and payable
      under the terms of this Note" means the total amount to which you are
      entitled to demand payment under the terms of this Note at the time you
      set-off.

      Subject to any other written contract, if my right to receive money from
      you is also owned by someone who has not agreed to pay this Note, your
      right of set-off will apply to my interest in the obligation and to any
      other amounts I could withdraw on my sole request or endorsement.

      Your right of set-off does not apply to an account or other obligation
      where my rights arise only in a representative capacity. It also does not
      apply to any individual Retirement Account or other tax-deferred
      retirement account.

      You will not be liable for the dishonor of any check when the dishonor
      occurs because you set-off against any of my account. I agree to hold you
      harmless from any such claims arising as a result of your exercise of your
      right of set-off.

      G. WAIVER. Except as otherwise required by law, by choosing any one or
      more of these remedies you do not give up your right to use any other
      remedy. You do not waive a default if you choose not to use a remedy. By
      electing not to use any remedy, you do not waive your right to later
      consider the event a default and to use any remedies if the default
      continues or occurs again.

13. COLLECTION EXPENSES AND ATTORNEYS' FEES. On or after Default, to the extent
permitted by law, I agree to pay all expenses of collection, enforcement or
protection of your rights and remedies under this Note. Expenses include, but
are not limited to, attorneys' fees, court costs and other legal expenses. These
expenses are due and payable immediately. If not paid immediately, these
expenses will bear interest from the date of payment until paid in full at the
highest interest rate in effect as provided for in the terms of this Note. All
fees and expenses will be secured by the Property I have granted to you, if any.
To the extent permitted by the United States Bankruptcy Code. I agree to pay the
reasonable attorneys' fees you incur to collect this Debt as awarded by any
court exercising jurisdiction under the Bankruptcy Code.

14. WARRANTIES AND REPRESENTATIONS. I make to you the following warranties and
representations which will continue as long as this Note is in effect:

      A. POWER. I am duly organised, and validly existing and in good standing
      in all jurisdictions in which I operate. I have the power and authority to
      enter into this transaction and to carry on my business or activity as it
      is now being conducted and, as applicable, am qualified to do so in each
      jurisdiction in which I operate.

      B. AUTHORITY. The execution, delivery and performance of this Note and the
      obligation evidenced by this Note are within my powers, have been duly
      authorized, have received all necessary governmental approval, will not
      violate any provision of law, or order of court or governmental agency,
      end will not violate any agreement to which I am a party or to which I am
      or any of my Property is subject.

      C. NAME AND PLACE OF BUSINESS. Other than previously disclosed in writing
      to you I have not changed my name or principal place of business within
      the last 10 years and have not used any other trade or fictitious name.
      Without your prior written consent, I do not and will not use any other
      name and will preserve my existing name, trade names and franchises.

15. APPLICABLE LAW. This Note is governed by the laws of Nebraska, the United
States of America and to the extent required, by the laws of the jurisdiction
where the Property is located. In the event of a dispute, the exclusive forum,
venue and place of jurisdiction will be in Nabraska, unless otherwise required
by law.

16. JOINT AND INDIVIDUAL LIABILITY AND SUCCESSORS. My obligation to pay this
Loan is independent of the obligation of any other person who has also agreed to
pay it. You may sue me alone, or anyone else who is obligated on this Loan, or
any number of us together, to collect this Loan. Extending this Loan or new
obligations under this Loan, will not affect my duty under this Loan and I will
still be obligated to pay this Loan. The duties and benefits of this Loan will
bind and benefit the Successors and assigns of you and me.

17. AMENDMENT, INTEGRATION AND SEVERABILITY. This Note may not be amended or
modified by oral agreement. No amendment or modification of this Note is
effective unless made in writing and executed by you and me. This Note is the
complete and final expression of the agreement. If any provision of this Note is
unenforceable, then the unenforceable provision will be severed and the
remaining provisions will still be enforceable.

18. INTERPRETATION. Whenever used, the singular includes the plural and the
plural includes the singular. The section headings are for convenience only and
are not to be used to interpret or define the terms of this Note.

19. NOTICE, FINANCIAL REPORTS AND ADDITIONAL DOCUMENTS. Unless otherwise
required by law, any notice will be given by delivering it or mailing it by
first class mail to the appropriate party's address listed in the DATE AND
PARTIES section, or to any other address designated in writing. Notice to one
party will be deemed to be notice to all parties. I will inform you in writing
of any change in my name, address or other application information. I will
provide you any financial statement or information you request. All financial
statements and information I give You will be correct and complete. I agree to
sign, deliver, and file any additional documents or certifications that you may
consider necessary to perfect, continue, and preserve my obligations under this
Loan and to confirm your lien status on any Property. Time is of the essence.

20. CREDIT INFORMATION. I agree to supply you with whatever information you
reasonably request. You will make requests for this information without undue
frequency, and will give me reasonable time in which to supply the information.

21. ERRORS AND OMISSIONS. I agree, if requested by you, to fully cooperate in
the correction, if necessary, in the reasonable discretion of you of any and all
loan closing documents so that all documents accurately describe the loan
between you and me. I agree to assume all costs including by way of illustration
and not limitation, actual expenses, legal fees and marketing losses for failing
to reasonably comply with your requests within thirty (30) days.

<TABLE>
<S>                                   <C>                                                         <C>
M-Tron Industries, Inc.
Nebraska Promissory Note                                                                  Initials_____
NE/4XX27073500725200004364003051404N  (c)1996, Bankers Systems, Inc., St. Cloud, MN [ILLEGIBLE]   Page 3
</TABLE>

<PAGE>

A CREDIT AGREEMENT MUST BE IN WRITING TO BE ENFORCEABLE UNDER NEBRASKA LAW. TO
PROTECT YOU AND US FROM ANY MISUNDERSTANDINGS OR DISAPPOINTMENTS, ANY CONTRACT,
PROMISE, UNDERTAKING, OR OFFER TO FOREBEAR REPAYMENT OF MONEY OR TO MAKE ANY
OTHER FINANCIAL ACCOMMODATION IN CONNECTION WITH THIS LOAN OF MONEY OR GRANT OR
EXTENSION OF CREDIT, OR ANY AMENDMENT OF, CANCELLATION OF, WAIVER OF, OR
SUBSTITUTION FOR ANY OR ALL OF THE TERMS OR PROVISIONS OF ANY INSTRUMENT OR
DOCUMENT EXECUTED IN CONNECTION WITH THIS LOAN OF MONEY OR GRANT OR EXTENSION OF
CREDIT, MUST BE IN WRITING TO BE EFFECTIVE.

BORROWER:

  M-Tron Industries, Inc.

    By  DAVID L. REIN
       -------------------------
    Authorized Signer

22. SIGNATURES. By signing, I agree to the terms contained in this Note. I also
acknowledge receipt of a copy of this Note.

BORROWER:

  M-Tron Industries, Inc.

    By  DAVID L. REIN
       -------------------------
    Authorized Signer

LENDER:

  First National Bank of Omaha

    By: /s/ James R. Kamm
        -----------------------------
        James R. Kamm, Vice President

<TABLE>
<S>                                   <C>                                                          <C>
M-Tron Industries, Inc.
Nebraska Promissory Note                                                                   Initials______
NE/4XX27073500725200004364003051404N  (c)(1996) Bankers Systems, Inc., St. Cloud, MN [ILLEGIBLE]   Page 4
</TABLE>

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