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In Reply to: RE: These things any good? posted by Ivan303 on August 01, 2015 at 13:13:13
Jim McShane says good things about the EH and TS reissue 6SN7s on his site. I haven't tried them personally, but only because my small stash of NOS has now been supplanted with a much larger stock of their 12V cousins. All the gear I design from this point forward will have switchable 6V-12V filaments for all octals except power stages.
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Buy Chinese. Bury freedom.
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Well, that's good enough for me! ;-)
NOS TS Round Plates can just rot in the basement. Not because I don't want to try them, but I doubt I can find them. :-(
It truly believe that the answer to your question depends on the actual demands placed on the tubes by the circuit.
I found these same Tung-Sol 6SN7 re-issues to sound great in my Aikido DIY Preamp, but the same tubes in my Atmasphere M60 just buzzed out loud, unusable.
Took them over to my friends house who also owns a pair of M60's, the same buzz came through the speakers.
So I sold all eight of them for $5.00 each to a very happy Cary SLP-05 Owner, he got eight of these for $40 while I paid $15 each. He reported back no issues, and great sound.
In my particular case the HK leakage of these brand new tubes was not good enough for my M60 amps that require much better HK leakage that these can typically deliver.
I also had used Electro-Harmonix 6SN7 in my M60's with the same result, buzz.
Now.. if I purchased 100 pieces and rolled them through, I likely would find eight that worked in my M60's.
Yet I have had great results with current production 6SN7 in other equipment I own and use so am grateful that they are still a large variety to choose from.
My 10 cents worth of direct experiences with these tubes.
The bitterness of poor quality remains long after the sweetness of low price is forgotten
Consider buying them from a dealer that rigorously tests them. ;-)
Agree...
Mr. Karsten had responded to my inquiry and he did confirm that the M60 OTL Amplifiers require 6SN7's with exceptional HK leakage parameters.
I ordered 8x Chinese 6SN7's fully tested from a well known Tube Seller and they have been in service since 2006 with no noises or buzzing.
And I rotate the 6SN7's every 6 months clockwise.
The bitterness of poor quality remains long after the sweetness of low price is forgotten
"It truly believe that the answer to your question depends on the actual demands placed on the tubes by the circuit."
I totally agree!!
And thanks for the info on the buzz. I have not run into it (or I've forgotten about it happening) but if I do I can refer back to your post. Much appreciated!!
Oh, one last thing - often the heater-cathode leakage is dependent on how hot the tube is running. I have an Amplitrex AT-1000 that makes it easy to see. That might be the reason for the difference between the Cary and your M60.
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