Funny you should ask that. I'm trying to have it both ways, with half of the R split and half directly to the complement. I've attached the schematic.
I have done as you suggest with R26 and R21. There's no damping of the instability, and I see a frequency response peaking up by a few dB just above 10 MHz.
I need to play more with the base stoppers to see what I can do with that without hurting output stage bandwidth. I'm trying to get the output stage response pole out to about 20 MHz to allow 60 dB of feedback at 20 kHz.
This is still a work in progress. I don't know if this is how it will look when it is finished.
Attachments
Seems like this is drifting and warrants a new thread in the amp forum...
What kind of end cans are you using and do you have reliable models for them?
What kind of end cans are you using and do you have reliable models for them?
True. Check out the message thread I have going here:
Best Transistors at Each Amp Stage
I'm using NJW0281 and NJW0302. I'm using Bob Cordell's models (3281 and 1302) for them.
Best Transistors at Each Amp Stage
I'm using NJW0281 and NJW0302. I'm using Bob Cordell's models (3281 and 1302) for them.