Tube DIY Asylum

RE: 6SN7 circuit

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This Post Has Been Edited by the Author

In Reply to: RE: 6SN7 circuit posted by Triode_Kingdom on March 27, 2017 at 09:27:12

I like the 6W6 tube myself and think it'd be an excellent choice. As a matter of fact I was the one that suggested its use (along with the 6V6) in a preamp thread of yours a few months back, if I remember correctly.

When I was looking into the BV preamp, I thought that instead of using around 15dB of local NFB at the output section only, it would be a good idea to cascade two anode followers each having around 10-12 db of local feedback. I ran some numbers at the time but couldn't get the input impedance of the first stage high enough to my liking and didn't want to transfer the burden of driving the preamp to the source ahead of it.

I didn't spent too much time on that exercise, but now that I think about it, maybe a high mu tube such as the 6SL7 in the input position, configured as an anode follower with a gain of ~2 driving another AF say a 6w6, wouldn't be a bad idea. But then you're moving completely away from the 6SN7 which you probably don't want to do.

Anyway, thanks for reminding me of this circuit, I now might take another look at it.

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