EXHIBIT 99.1
[LOGO OF SPARTON CORPORATION]                                       NEWS RELEASE


     SPARTON CORPORATION COMPLETES ACQUISITION OF ASTRO INSTRUMENTATION LLC

JACKSON, Mich.--(BUSINESS WIRE)--May 31, 2006--Electronics Design  and
Manufacturing (EMS) service provider,  Sparton Corporation  (NYSE:SPA) announced
that it signed a membership  purchase agreement and completed the acquisition of
Astro Instrumentation, LLC ("Astro") on May 31, 2006.

Astro is a privately owned company located in Strongsville, Ohio and has been in
business for approximately 5 years. Astro was formed in 2000 by Hal Waldman and
Doug Wood of Pittsburgh, Pennsylvania who owned the company through intervening
entities. Astro's audited sales volume for the year ended December 31, 2005, was
approximately $33 million.

The purchase price is approximately $26.15 million. Additional consideration may
be paid to the sellers over the four years following the closing based on a
percentage of earnings before interest and taxes. Under the terms of the
Purchase Agreement, Mr. Waldman and Mr. Wood entered into non-competition
agreements with the Company.

Astro designs, manufactures and sells a variety of specialized medical products,
generally involving high-quality medical laboratory test equipment. Astro
operates from a 40,000 square foot facility in an industrial park. A 20,000
square foot addition to the facility is now under construction.

Sparton's intent is to operate the business as a wholly-owned subsidiary at its
present location and with the current operating management and staff.

                          About Sparton Corporation

Sparton Corporation (NYSE:SPA), now in its 106th year, provides design
engineering and electronics contract manufacturing services, which, including
the Astro acquisition, utilizes eight manufacturing locations encompassing
nearly 915,000 sq. ft in North America and Vietnam. In addition to strong core
competencies including surface mount technology (SMT), plated through-hole
(PTH), printed circuit board assembly (PCBA) and complete assembly manufacturing
capabilities, Sparton offers a complete range of pre-manufacturing,
post-manufacturing and engineering services. Pre-manufacturing services include
product development, concurrent engineering, design for test (DFT), design for
manufacturing (DFM), design for assembly (DFA), printed circuit board design and
quick-turn prototyping. Post-manufacturing services include repair depot, direct
ship, distribution management to field support.

                    Safe Harbor and Fair Disclosure Statement

Safe Harbor statement under the Private Securities Litigation Reform Act of
1995: To the extent any statements made in this release contain information that
is not historical, these statements are essentially forward-looking and are
subject to risks and uncertainties, including the difficulty of predicting
future results, the regulatory environment, fluctuations in operating results
and other risks detailed from time to time in the Company's filings with the
Securities and Exchange Commission (SEC). The matters discussed in this press
release may also involve risks and



uncertainties concerning Sparton's services described in Sparton's filings with
the SEC. In particular, see the risk factors described in the Company's most
recent Form 10K and Form 10Q. Sparton assumes no obligation to update the
forward-looking information contained in this press release.


                                     # # #