Good Evening

I just replaced the full complement of tubes in a small Single-Ended Triode amplifier I have. This is a 6L6 - based amp (self-biasing design, Chinese-made - like so many so-called "high-end" audio nowadays), and one of the ouput tubes quit on me.

I replaced the Chinese 6N3 input tubes with G.E. (JAN) 5670W tubes and the power tubes with JJ 6L6GC tubes. The difference in sound quality is quite astounding - so much so that it sounds like a completely different (and much better) amplifier. I ascribe much of this improvement in sound quality to the JJ 6L6GC tubes - clean, crystal highs that makes my toes curl!

So... question: I know I can run KT66 tubes on this little SET amplifier as well. Does that mean that I can run 6L6GC tubes in my ST-70 (probably biased lower) as well? Like I say, the 6L6GCs just sound so damn good!

Best regards to all
'Jan in BC, Canada

In fact Dynaco itself, in the Stereo 70 assembly manual on Page 10, said that the 5881 and KT-66 can be used in the Stereo 70 with a bias adjustment. The 5881 is a 6L6-type tube, so the 6L6GC will work just fine.

6L6GC tubes work great and sound great in the ST70

Do you have to do anything to anywhere to use 6L6. I have a bunch of organ tubes I would love to try but had no idea you can use them in the Dynaco.