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Questions about tubes and gear that glows. FAQ

What does the middle 6NS7 do?

I have a stock ST-70 that's been re-capped with new RCAs, etc. I tried the adapter to the 6GH8A and had a couple of old 7199s that were weak. Eventually, a couple of NOS RCA 7199s turned up and are nice.

Still, why use 12AU7s and add another 6NS7? I do like the octals, but I'd have thought that there would be a replacement driver board with just 2 of them.

-Rod


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