Eitel-McCullough, Inc. - Specimen Stock Certificate
Inv# SE2618A Specimen Stock
Specimen Stock printed by American Bank Note Company. Green, Blue or Orange Available. Please specify color. Eimac is a trade mark of Eimac Products, part of the Microwave Power Products Division of Communications & Power Industries. It produces power vacuum tubes for radio frequency applications such as broadcast and radar transmitters. The company name is an initialism from the names of the founders, William Eitel and Jack McCullough.
The San Francisco Bay area was one of the early centers of amateur radio activity and experimentation, containing about 10% of the total operators in the US. Amateur radio enthusiasts sought vacuum tubes that would perform at higher power and on higher frequencies than those then available from RCA, Western Electric, General Electric, and Westinghouse. Additionally, they required tubes that would operate with the limited voltages available from typical amateur power supplies.
While employed by the small San Francisco, California manufacturing firm of Heintz & Kaufman which manufactured custom radio equipment, Bill Eitel (amateur radio call sign W6UF) and Jack McCullough (W6CHE) convinced company president Ralph Heintz (W6XBB) to allow them to develop a transmitting tube that could operate at lower voltages than those then available to the amateur radio market, such as the RCA UV-204A or the 852. Their effort was a success and resulted in production of the HK-354. Shortly after in 1934, Eitel and McCullough left H&K to form Eitel McCullough Corp. in San Bruno California. Read more at https://en.wikipedia.org/wiki/Eimac
Stock and Bond Specimens are made and usually retained by a printer as a record of the contract with a client, generally with manuscript contract notes such as the quantity printed. Specimens are sometimes produced for use by the printing company's sales team as examples of the firm’s products. These are usually marked "Specimen" and have no serial numbers.
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