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Single Ended Triodes (SETs), the ultimate tube lovers dream.

RE: A2 all the time

Yes, agreed. I built a driver that would handle the requirements, which a scope and distortion measurements confirmed.

My last attempt at constant A2 was with 805s since I had everything I needed. Sound was good and I'm sure many would have thought more than acceptable, it just wasn't great like my 845s.

Many possible reasons. The curves for an 805 aren't fantastic and I'm sure that's why GNFB seems to be commonly used with this tube. I never use it but tried it for comparison purposes. The interesting thing is that although it certainly greatly assisted linearity it murdered sonics and I MUCH prefered the sound of zero NFB despite the increased distortion.

I still prefer biasing in A1 but designing with clean transition into A2 on peaks as necessary, generally brief.

Naz


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