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$20

$100

General Radio Company (GR / GenRad) precision lab instrument

Posted in Lebanon, PA

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Justin Santos

Justin Santos

Joined Aug 2023

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Description

Manufacturer: General Radio Co. (Cambridge, Mass., U.S.A.) ​Black Cased Unit: General Radio Type 815-B (12 mf). This is a precision potted filter capacitor/choke assembly used in early GR frequency standards and laboratory power supplies. ​Slotted Metal Structure & Mount: Early precision crystal oven / quartz crystal holder assembly. The circular cutout and long slot milled into the thick metal bar held a ground quartz crystal slice for ultrastable RF frequency generation. ​Vintage Hardware & Connectors: ​Cannon Plug Panel: Early 3-pin Cannon audio/RF connector alongside a heavy-duty toggle switch. ​Bakelite / Ceramic Mounting: Vintage brown bakelite wire-wound resistors, binding posts, and cloth-covered wiring. ​Property Stencil: Stenciled UNITED STATES GOVERNMENT on the lower baseplate, indicating US military or government laboratory research origins.

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Condition

Used (normal wear)

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