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RE: Oh wow! So I could do that too with my ST-70?

Posted by Cougar (A) on March 15, 2023 at 12:40:22

In Reply to: Oh wow! So I could do that too with my ST-70? posted by JoshT on March 15, 2023 at 09:39:37:

Airtime is a member over on AK where we all who built the VTA kit/s went to help or get help. There was a thread over there a while back may around 2015 and Skizo was the one who mentioned about putting a 6SN7 in the middle splitter spot I tried iy and I think Airtime tried after I did but I could be wrong. That is where the biggest difference in sound for me happened. I was using Northern Electric 6SN7's in that spot but they kept humming. Then I was on the Upscale Audio site and saw Kevin found a bunch of Russian 6H8C (Equivalent to 6SN7) and were cheap. I bought some and that was the ticket! Had the same sound as the NE 6SN7 but with better mids and bass. I have been running it ever since.

Yes, you will need a 6SN7 to 12AU7 adapter to make this work. My PCB came with my kit but if I'm correct, Roy offers a 6SN7 Octal pcb for the VTA-120 and 70. Some will say you can't run that tube in the 12AU7 spots but I only used it in the middle splitter spot and has worked fine. I would check out the threads over there to see what we all did. My Moniker there is Drummerboy2.

Skizo, Airtime, and another person were all helpful and offered a lot of info and help to others. Just goto the Tube section and search for the VTA-70/120 kit builds threads around 2015-2017. Mine was ("Just Pulled the trigger on Bob Latino's VTA-120 tube power amp"). I think that's were most of the info is at for the VTA amp builds between those years. Also, these amps are nothing like the Dynaco amps other than they look like them. Totally different circuits and better heftier transformers.

btw, I got the Auto-Bias PCB for my VTA-120 a few months back, I still need to install it. I will do that after cleaning and tightening all the socket pins

Happy Reading! :)

Edits: 03/15/23 03/15/23 03/15/23

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