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Tung-Sol 6520 - test questions

24.59.229.201

I have some Tung-Sol 6520 tubes to test. Doing some research shows it's a version of the 6AS7.

I'm confused by what I'm seeing on my Hickok testers charts.

The 539B wants to test it as a rectifier @ 6.3 volts. No micromho value. Read the Rectifier and Diodes OK area of the meter.

The 6000A wants to test it @ 7.5 volts, with a average new test value of 2600 on the chart.

I'm lost. This is a tube I'm not familiar with.

Who's right or wrong, or both?

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Follow Ups:

RE: Tung-Sol 6520 - test questions - MP62 17:11:45 02/19/23 (0)
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.
This is what I have found: - John PA 12:26:55 02/19/23 (0)
And I see it as interchangeable with 6AS7.
Link below to the tube.

iBasso DX300MAX Ti. Focal Utopia and Stellia. iBasso SR2. Mr. Speakers, Ether II, Voce stats. Manley, Absolute headphone amp. LTA MZ3, Z10e electrostatic amp. Many other headphones, amps, cables etc.
- https://www.radiomuseum.org/forumdata/upload/6520%7E%7E1%2Ep (Open in New Window)
Edits: 02/19/23 02/19/23 02/19/23

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