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In Reply to: Tung-Sol 6520 - test questions posted by Byrd69 on February 19, 2023 at 09:26:26:
Hi.
Must be a mistake in the 539B testing manual.
The 6520 tube is a 6AS7 - sometimes with domino plates - that make it more desirable (like the 5998 and 2399 tubes). It is common to have testing at 7.5 Volts, especially on the KS series of testers.
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- RE: Tung-Sol 6520 - test questions - MP62 17:11:45 02/19/23 (0)