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George A Philbrick Computer Tube Op-Amp K2-W w/ (2) GE JAN 5751 (12AX7) 1952 For Sale


George A Philbrick Computer Tube Op-Amp K2-W w/ (2) GE JAN 5751 (12AX7) 1952
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George A Philbrick Computer Tube Op-Amp K2-W w/ (2) GE JAN 5751 (12AX7) 1952:
$16.50

Up for offers is the George A. Philbrick tube type op amp, type K2-W. It was, in 1952, the first full differential unstabilized op amp. It is clean and in excellent condition. It comes with (2) matching General Electric JAN 5751 (12AX7) tubes. The tubes are also clean and in good condition. The green Sylvania designations are worn, but readable, the 5751 designation also appears in the standard G E etching style numerals, visible in the photos and much clearer. Each tube is tested OK on my EICO dynamic tester and they show no shorts or interelectrode leakage. These two have dark grey ribbed plates and top round getters. The silver flashing looks good on both tubes. The op amp has its original factory tags, reading as follows: GAP/R Model K2-W and George A. Philbrick Researches, Inc, Boston 16 Mass. 21683 Made in the USA. The octal base and its pins are also clean and in good condition. The tubes are tested, but the op amp itself is not. offer on it for your own collection. These units seldom come up for offerding in this nice condition. !! View the photos carefully and please send any questions you may have. Thanks for looking.

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