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    Building, troubleshooting and testing of these amplifiers should only be
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    the safety precautions around high voltages.

6sl7 vs 6n9p vs 6n9s

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I use 6SL7 as drivers for 2 single-ended amps and push-pull EL34 monoblocks. I've tried heaps of NOS US tubes, including red-base 5691, quite a few Mullard and Philips ECC35, and Russian military 6h9c. The only tube swap in which my wife (with golden ears) has ever said, 'holy x*&!, that's better), was with a short brown based Mullard ECC35. I haven't tried any of the Chinese varieties, but late model US versions with wafer bases seem just as good to me as early vintage ones. I save the expensive Mullard ECC35's that my wife likes for 'let's dim the lights' evenings.
 
Please comment on these tubes. Can they be classified as the good the bad and the ugly (badass)?
I believe that they are direct replacement of each other. But would there be any sound difference or only difference in tube life?
Always there are differences in SQ and price, 6H9C are cheap but its a 250V version not robust 450V as the GTB.
Sino 6N9P also 250V but not cheap as the Russian 6H9C.
 
There is no difference at all with 6H9C and the best 6SL7GTB up to 400V.
I never had any issue using the soviet equivalent.

You will pay 15 $ for a 6H9C (transport and tax included) and 50 $ for the best tung sol.
No difference... If I am going to go for a type of tube I buy a dozen and select the best sounding 1/15. 5 % to 20% parameter difference as usual you cannot generalize.

Go for 6H9C while supplies last
 
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