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                                                                      EXHIBIT 10

                       SECOND AMENDMENT TO LOAN AGREEMENT
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         THIS SECOND AMENDMENT TO LOAN AGREEMENT (the "Second Amendment") is
made this 26th day of February, 1999, at Cleveland, Ohio, by and among THE
HUNTINGTON NATIONAL BANK ("Bank"), whose principal office is located at 917
Euclid Avenue, Cleveland, Ohio 44115, HICKOK INCORPORATED, whose address is
10514 Dupont Avenue, Cleveland, Ohio 44108 ("Borrower"), and SUPREME ELECTRONICS
CORP., whose address is 10514 Dupont Avenue, Cleveland, Ohio 44108
("Guarantor").

                                    RECITALS
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         A. The Borrower and Bank entered into a Restated Loan Agreement dated
            as of February 28, 1997 (the "Loan Agreement") and a First Amendment
            to Loan Agreement dated as of February 18, 1998 (the "First
            Amendment"), pursuant to which Bank agreed to make available to the
            Borrower a loan of up to $5,000,000.00. Capitalized terms used
            herein and not otherwise defined shall have the meanings assigned to
            them in the Loan Agreement.

         B. The Borrower has requested certain amendments to the Loan Agreement.

         C. As a material inducement to Bank to make the amendments to the loan
            herein contemplated, Guarantor for good and valuable consideration
            is willing to deliver to Bank an acknowledgment of the Continuing
            Guaranty Unlimited.

         D. Bank is willing to make the amendments and modifications to the loan
            herein described, upon the terms, covenants and conditions herein
            set forth, and in reliance upon the representations and warranties
            of Borrower herein contained.

         NOW, THEREFORE, in consideration of the foregoing Recitals, the terms,
covenants and conditions hereinafter set forth, and other good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged, the
parties agree as follows:

1 AMENDMENTS. The third sentence of Section 2.1 is hereby further modified and
amended to extend the maturity date of the Loan and the Revolving Note to
February 29, 2000.

2 BORROWER'S REPRESENTATIONS. WARRANTIES AND EVENTS OF DEFAULT.

         2.1 REPRESENTATIONS AND WARRANTIES

            2.1.1. Except as amended hereby, the terms, provisions, conditions
         and agreements of the Loan Agreement and the First Amendment to Loan
         Agreement are hereby ratified and confirmed and shall remain in full
         force and effect. Borrower expressly acknowledges that this Second
         Amendment shall not constitute a novation or waiver. Each and every
         representation and warranty of the Borrower set forth in the Loan
         Agreement and the First Amendment to Loan Agreement is hereby confirmed
         and ratified in all material respects and such representations and
         warranties shall be deemed to have been made and undertaken as of the
         date of this Second Amendment as well as at the time they were made and
         undertaken.


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         2.1.2. The Borrower further represents and warrants that:

            2.1.2.1. No Event of Default now exists or will exist immediately
         following the execution hereof or after giving effect to the
         transactions contemplated hereby.

            2.1.2.2. All necessary corporate or shareholder actions on the part 
         of the Borrower to authorize the execution, delivery and performance of
         this Second Amendment, the Second Modification and Amendment to the
         Revolving Credit Note and all other documents or instruments required
         pursuant hereto or thereto have been taken; this Second Amendment, the
         Second Modification and Amendment to the Revolving Credit Note and each
         such other document or instrument have been duly and validly executed
         and delivered and are legally binding and binding upon the parties
         thereto and enforceable in accordance with their respective terms,
         except to the extent that the enforceability thereof may be limited by
         bankruptcy, insolvency or like laws or by general equitable principals.

            2.1.2.3. The execution, delivery and performance of this Second
         Amendment, the Second Modification and Amendment to the Revolving
         Credit Note and all other documents or instruments required pursuant
         hereto or thereto, and all actions and transactions contemplated hereby
         and thereby will not (A) violate, be in conflict with, result in a
         breach of or constitute (with due notice or lapse of time or both) a
         default under (1) any provision of the Articles of Incorporation, Code
         of Regulations or Bylaws of the Borrower, (2) any arbitration award or
         any order of any court or of any other governmental agency or
         authority, (3) any license, permit or authorization granted to the
         Borrower or under which the Borrower operates, or (4) any applicable
         law, rule, order or regulation, indenture, agreement or other
         instrument to which the Borrower is a party or by which the Borrower or
         any of its properties is bound and which has not been waived or
         consented to, or (B) result in the creation or imposition of any lien,
         charge or encumbrance of any nature whatsoever, except as expressly
         permitted in the Loan Agreement, upon any of the properties of the
         Borrower.

            2.1 .2.4. No consent, approval or authorization of, or filing,
         registration or qualification with, any governmental authority or any
         other person or entity is required to be obtained by the Borrower in
         connection with the execution, delivery or performance of this Second
         Amendment, the Second Modification and Amendment to the Revolving
         Credit Note or any document or instrument required in connection
         herewith or therewith which has not already been obtained or completed.

3 AFFIRMATION AND AGREEMENT OF THE BORROWERS AND THE GUARANTOR. The Borrower and
the Guarantor have executed this Second Amendment to consent to the amendments
to the Loan Agreement made pursuant hereto.

4 FEES AND EXPENSES. As required under the Loan Agreement, the Borrower shall
pay a facility fee of $5,000.00 upon execution hereof, and shall reimburse the
Bank upon demand for all out-of-pocket costs, charges and expenses of the Bank
(including reasonable fees and disbursements of legal counsel to Bank in
connection with the preparation, negotiation, execution and delivery of this
Second Amendment and the other agreements or documents relating hereto or
required hereby).


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5 REFERENCE TO LOAN AGREEMENT. Except as amended by the First Amendment to Loan
Agreement and hereby, the Loan Agreement shall remain in full force and effect
and is hereby ratified and confirmed in all respects. On and after the
effectiveness of the Second Amendment to the Loan Agreement accomplished hereby,
each reference in the Loan Agreement to "this Agreement," "hereunder," "hereof,"
"herein" or words of like import, and each reference to the Loan Agreement in
any Note or other Loan Document, or other agreement, document or instrument
executed and delivered pursuant to the Loan Agreement, shall be deemed a
reference to the Loan Agreement as previously amended and amended hereby.

6 COUN TERPARTS. This Second Amendment may be executed in as many counterparts
as may be convenient, each of which when so executed shall be deemed to be an
original for all purposes, and shall become binding when the Borrower, the
Guarantor, and Bank have executed at least one counterpart.

7 FURTHER ACTS. The parties agree to perform any further acts and to execute and
deliver any additional documents which may be reasonably necessary to carry out
the intent and provisions of this Second Amendment.

8 BINDING EFFECT. This Second Amendment shall be binding upon and shall inure to
the benefit of the Borrower, the Guarantor, Bank, and their respective heirs,
personal representatives, successors and assigns.

         IN WITNESS WHEREOF, the parties have signed this Second Amendment to
Loan Agreement, intending to be legally bound thereby as of the Effective Date.

                                           BORROWER
                                           HICKOK INCORPORATED

/s/ Eugene Nowakowski                      By: Robert L. Bauman
- --------------------------                     ----------------------
                                               Robert L. Bauman, President

/s/ Carmelita Gerome      
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Signed in the presence of:                 THE HUNTINGTON NATIONAL BANK
(as to all signatures)

                                           By: /s/ Herbert J. Werner
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/s/ Carmelita Gerome                           Herbert A. Werner
- --------------------------                     Vice President
/s/ Darlene Gray
- --------------------------




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