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Exactly. I knew that NFB would factor in here and it seems it would work ok on a 10X reduction scale for some pentodes. One other particular circuit that came to mind was the Langevin 111/WE120 where it looks like you'd have to be lowering effective 6SJ7 plate resistance from 1M or greater to a very low -say 3.5K (assuming 40H) source impedance to get around a 30Hz corner. I'm likely missing another factor somewhere in trying to break this down - maybe not true pentode operation in this instance?http://www.audiosharing.com/archive/western/we_amp/pdf/No.120-A.pdf
Exactly.
I knew that NFB would factor in here and it seems it would work ok on a 10X reduction scale for some pentodes. One other particular circuit that came to mind was the Langevin 111/WE120 where it looks like you'd have to be lowering effective 6SJ7 plate resistance from 1M or greater to a very low -say 3.5K (assuming 40H) source impedance to get around a 30Hz corner. I'm likely missing another factor somewhere in trying to break this down - maybe not true pentode operation in this instance?
http://www.audiosharing.com/archive/western/we_amp/pdf/No.120-A.pdf
