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(1) Tested Arcturus Type 57 Tube Shouldered Blue Pentode Detector Tube (a)

(1) Tested Arcturus Type 57 Tube Shouldered Blue Pentode Detector Tube (a)

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$34.95 USD
$34.95 USD
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(1) Tested Arcturus Type 57 Tube.

Shouldered envelope.
There is a subtle rattle in the base from loose cement, obviously this doesn't affect performance. The base is tight and secure.

Tested on a calibrated Hickok TV-10 military tube tester and exhibiting no shorts or leaks with the following results:

Gm Test = 1125 micromhos
Minimum pass/good = 770
NOS rating = 1155

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