Tubes Asylum

RE: TungSol JAN-CTL-6SN7WGT tubes with Cary SLI-80

109.252.180.54

Akolegov88

In Reply to: RE: TungSol JAN-CTL-6SN7WGT tubes with Cary SLI-80 posted by 6bq5 on April 08, 2024 at 14:04:22

Thanks a lot, your comments are very useful.

As for his statement 'Did not work and produced a noise' -it was my awkward translation. What he actually said was 'One does not play and clicks when [the amp?] is switched on.' Is it still an incompatible statement?

Follow Ups:

RE: TungSol JAN-CTL-6SN7WGT tubes with Cary SLI-80 - 6bq5 16:44:04 04/08/24 (6)
Hard to say-
I am not that familiar w/ the amp-
however all tubes can make some noise on warm-up and cool down due to thermal expansion - some are noisier than others - Octals tend to make more noise than 9-pin bottles-

as a 'driver' tube between the pre amp section and the output tubes, it has a simple job - to give the signal enough boost to ride the power tubes to the Output transformers thence to the speakers-

the tube should work (as sitting in a drawer for 10 or 50 years does not change the tube, and they worked well before)

you may have a picky customer who is looking for a quieter / better(?) tube...
hard to know or to please-

I am sure you sold it for a reasonable price (as opposed to some of the rated and cryo treated tube costs, so coming to an agreement is important, but how much effort is it worth...
Happy Listening
- Tube testers do not test for noise - Alpha Al 19:56:14 04/08/24 (5)
  They measure emission, or on better testers they measure trans conductance.
  
  A tube can test excellent on a tester, but may be too noisy to be usable in a specific application, especially a high-gain circuit like a phono preamp..
  - This one does - Tre' 17:44:34 05/16/24 (0)
    This one does.
    
    Tre'
    Have Fun and Enjoy the Music
    "Still Working the Problem"
    - https://www.google.com/search?client=firefox-b-1-d&q=hikcock (Open in New Window)
  - Some claim to be able to test for "noise" - Steve O 08:53:10 04/10/24 (3)
    This particular tester has a "noise test". User is instructed to connect the two "noise" jacks to the antenna input of an AM radio. Tube is then set up and at some points in the test sequence you listen for noise on the radio either as the tube sits or by "flicking" it. Don't think this is up to audiophile standards but . . .
    - this guy tests for everything - elblanco 16:52:30 05/01/24 (0)
      h
      https://vintagetubeservices.com/laboratory/ (Open in New Window)
    - RE: Some claim to be able to test for "noise" - Triode_Kingdom 20:13:51 04/12/24 (1)
      I don't own a TV-7, so I never noticed that feature. Like you say, it might only detect tubes that are so noisy, it would be the result of a broken internal support or internal arcing. An AM radio isn't going to provide a noise floor low enough to compare small signal tubes for hi-fi characteristics.
      - RE: Some claim to be able to test for "noise" - Steve O 04:59:34 04/13/24 (0)
        
        In Reply to: RE: Some claim to be able to test for "noise" posted by Triode_Kingdom on April 12, 2024 at 20:13:51
        
        The TV7 is a military device designed for rough field service, is waterproof when lid is closed and has super rugged construction. Interestingly, there's a note somewhere in the operator or service manual that states something to the effect that despite tester results, the only real test of functionality is whether or not the tube performs properly in a circuit. IOW, a diagnostic tool but not the final word on tube condition.

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