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RE: Determining the size of inter-stage coupling cap

I seem to be having some trouble posing a reply for some reason...

>>>Why does replacing R10 with a choke have the impact of changing R10 to 250k? Damping resistor? I thought a significant benefit of using grid chokes was a dramatic reduction in the grid-to-ground resistance. <<<

Al reported good results replacing R10 with a MagneQuest BCP-16 GC, so I just assumed its impedance was somewhere close to 250k. Paul's original advice was to change R10 from 390k (from original Sound Practices article) to 250k to allow for greater grid leakage than the original WE91.

Given the design of R10= ~250k and that a substitution of R10 with a choke seemed not to cause problems, I was wondering how much latitude exists with the choice of C7 and if it could be increased from 0.1uF to 0.25uF without introducing problems. Or should I stick with 0.1uF for this part?

Please be patient with me, I'm new to tubes and trying to learn.

Thanks!




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