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6SN7 Tube Addicts

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  1. LoryWiv
    It does, yes. Thanks @Ripper2860 for helping a relative "tubey - newbie" make sense of this complex but endlessly fascinating topic. :smile_phones:
     
    Ripper2860 likes this.
  2. ken6217
    I have a Cayin 300B amp that takes two 6SN7 driver tubes. The manual says that it also takes ECC32 tubes. I tried a pair of unused NOS Mullard ECC32 tubes tonight, and the sound seems to have some distortion. I know the tubes need breaking in but I hadn't heard this type of sound on new tubes before. Seems more prevalent in the bass. Could it be bad tubes, or is it break in? I’ve certainly had new tubes in my amp before but didn’t have this type of experience. Any ideas? Thanks.
     
  3. m17xr2b
    Could be dirty pins, try to clean them with some sandpaper or deoxit.

    Never had distortion with ECC32 and 300B on the WA5 or any other tube amp. Could be your source is too hot as these have higher amplification. Try with something else like a phone see if it distorts.
     
  4. ken6217
    Thanks for the reply. I have Deoxit. I’ll give it a try.

    When you say the source could be hot, what exactly did you mean? I’m using the amp as a headphone amplifier.
     
  5. ken6217
    By the way, will I damage the amp by using this while I’m testing to see if I can turn it around?
     
  6. m17xr2b
    Standard DACs should have 2V output from single ended and I think 4V for balanced. Some have 3V or even 4V output out of single ended and 6V for balanced, couple that with a higher gain input tube biased at the edge and it can distort depending on the operating point of the amplifier

    Quick and not entirely accurate info:

    Tubes are negativity biased on input. For example you can have -3V grid and couple that with a +2V input the tube never sees positive voltage on the grid(which would be bad).
    I think gain also has an impact, ECC32 has 32 gain where 6SN7 has 20ish.

    Say you have -3V grid with +4V input from a hot dac(hot meaning it has higher voltage that it should be), now you are overdriving the tube and can cause distortion.

    What's your dac?

    Shouldn't cause any harm, unless the tubes are bad are are near failure.
     
    Last edited: Aug 20, 2019
  7. ken6217
    The DAC is a Metrum Pavane. 4V output.
     
  8. m17xr2b
    I've got the Pavane as well, it's not the cause unless there's some weird incompatibility between it and you amp which I doubt. Still, try another source to be sure.
     
  9. LoryWiv
    In addition to looking into NOS tubes, was considering the new production Psvane CV-181TII as drivers for my Feliks-Audio Elise and noted another new production option at about same cost: Northern Electric 6SN7. Does anyone have experience with one or both of these? Comparisons would be especially helpful. Thanks!
     
    llamaluv likes this.
  10. TheSnafu
  11. LoryWiv
  12. LoryWiv
    Wondering if anyone has tried the Sylvania made Baldwin organ 6SN7 vintage tubes. They are not hard to source and fairly inexpensive. The concept that they were purpose-made for a musical instrument raises my hopes that they will perform well in my Felik Audio Elise as drivers. I realize, however, that may not necessarily be true so if anyone's used them as a driver tube, I'd really appreciate your impressions.
     
  13. attmci
    https://www.head-fi.org/threads/the-6sn7-identification-guide.209782/page-13
     
  14. LoryWiv
  15. MasonStorm
    When using any of those two-other-tubes-in-a-converter-to-a-single-6SN7 contraptions (I have 6J5G's, 7193's and 76's with the appropriate two-to-one adapters from eBay merchants), is it more important to insert two tubes that are closely matched for plate current, or for transconductance? Which measurement takes precedence?
     
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