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In Reply to: RE: 6SN7 circuit posted by Triode_Kingdom on March 25, 2017 at 21:59:58
I'd be interested in your BV 6SN7 preamp since it is non-inverting.
Can you post the schematic here?
I worked out two schematics in SPICE. Both feature significantly less distortion and more typical tube loads than the original. Output Z of the first is about 4K Ohms. The second version adds a cathode follower to provide an output Z around 450 0hms. The follower is biased such that an additional coupling cap is not required. It will easily swing 50V p-p.
Now that I'm thinking about using 6W6s in triode mode instead of 6SN7s, the follower probably isn't needed. Wish I had a SPICE model for the 6W6!
Buy Chinese. Bury freedom.
The SRPP as gain stage is not too bad, but it inverts and has a higher output Z.
These look like a better option for a preamp.
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