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6SN7 Tube Addicts

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  1. gibosi
    I know nothing about your amp... But the 6SN7 heaters draw 0.6A whereas the 6922 heaters draw only 0.3A, twice as much, so be sure your amp can handle this. Otherwise, you could damage your amp.

    And yes, if you can safely roll 6SN7, you can also roll the Psvanes CV 181, which is just a "pretty" 6SN7. :)
    Scutey likes this.
  2. canthearyou
    *That sounds amazing.
  3. gibosi
    Unfortunately your pictures are too dark to see any detail...

    First, the color of the base has no affect on the sound. It is what is inside the glass bottle that matters.

    This Tung-Sol 6SN7GT is called "mouse ears" because of the unique round mica spacers. To my knowledge, no other 6SN7 has this structure. Later versions of this tube have "squared" ears, and even later versions, the ears disappeared. However, the plates remained the same, ribbed and gray.

    2018-03-09 10.49.44.jpg
  4. gibosi
    And a bit more about the Tung-Sol "mouse ears" 6SN7GT. Here is an engineering sample from 1949. I don't think this version was ever put into production.

    2018-03-09 11.30.31.jpg 2018-03-09 11.30.59.jpg
  5. Scutey
    Great info!, gibosi!.
  6. Scutey
    Good to hear you're enjoying them chy, if the reviews are correct then I guess you still might have someway to go, enjoy the burn in, I'm hoping mine will arrive tomorrow and then I can begin the long road to audio nirvana! :wink:.
    canthearyou likes this.
  7. gibosi
    We all have different ears and different gear... :)

    It is important to understand that the "real" CV181, as manufactured by Mullard, is not the same as a 6SN7. It has a higher amplification factor, 32 compared to 20, and the heaters draw 0.95A. And again, not every amp designed to run 6SN7 can handle the higher heater current. But the Psvane product is not really a CV181. It is a merely a 6SN7 in an ST bottle. And I will leave it to others to debate its sonic characteristics. :)
  8. gibosi
    A Mullard CV181 from the mid to late 1940's.

    2018-03-09 13.47.31.jpg
    canthearyou likes this.
  9. TheSnafu
    ^^^ thanks for the adapter info, tubedepot said that it's safe to try this adapter&tube combo with 6922.
    i'm gonna order pair and see how it goes.

    while searching info i also found that 6SN7's can be used (with adapter) instead of 12AU7's.. and my power amp uses 12AU7's... :metal:

  10. davveswe
    I am wondering if it safe to use a 6SN7(Top) TO 6J5(bottom) adapter?
    When using a 6J5 to 6SN7 adapter, you use two 6J5 tubes. 6SN7 has more gain?
  11. gibosi
  12. ericr
    Check out the Ember Tube Rolling thread. Several Project Ember owners are doing this so you'll find info on adapters and favorite tubes.
  13. L0rdGwyn
    Hey people - just started going through this thread a few days ago. I am upgrading my Bottlehead Crack to a Crackatwoa, going to be doing some modding and decided to give the 6SN7's a go as my drivers. Was hoping for some recommendations as far as quality 6SN7's that are around $75 or less in price. So far, I picked up a Sylvania JAN CHS 6SN7W short bottle with black base and green text for $70 (not sure of the exact year, but presumably 1940's) and a 1953 Hytron 6SN7GT NIB for $30.

    Some other tubes I am looking at are the RCA VT-231/6SN7GT gray glass from the 1940's (seems to run around $50) and the Ken Rad VT-231 black glass (seems to run around $75). I know some of the Tung Sol's are highly regarded, but the round plates seem to be out of my price range.

    How did I do on my first purchases, and are the RCA and Ken Rad good pick-ups as well? Any other recommendations would be appreciated. Cheers!

    P.S. Below are the two tubes I've purchased. I also run the Western Electric 421A and Tung Sol 5998 as output tubes on the Crack.

    s-l1600.jpg 986562329_tp.jpg
  14. Scutey
    Some nice tubes their @L0rdGwyn. My recommendation would be the 6N8S Foton, 52-55, Ribbed anode, strictly between those years, nothing after, they're cheap but rare, they offer a superb spacious, transparent, detailed and dynamic/punchy sound. I know Foton tubes have a patchy reputation but the 52-55 ribbed anode is a cracker, a genuine sleeper imo, if you are interested here is a link to where I bought mine.

    L0rdGwyn likes this.
  15. L0rdGwyn
    Fantastic! Thanks for the recommendation and the link, @Scutey . I think I will pick up a set, four tubes for $30 USD, a little overkill HA but that's how it goes with the Russian tubes.

    Just out of curiosity, how did you hear about the 6N8S from Foton being high-performing in such a narrow date range?
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