6SJ7 preamp, 6SN7 paraphase inverter, 2 x 6V6 with local negative feedback.
GIBSON BR6-F GUITAR AMPLIFIER SCHEMATIC
Clearly a bit of work has been done on this one - just using the pic as an example of circuit construction.
Low impedance input
6SJ7 PRE
Ra 220k
Rk 2k2 20u bypass
Screen 2m2, 50n bypass
10n coupling cap to 500k volume pot
6SN7 PI
Ra 100k
Rk 3k3 (not bypassed)
50n coupling to 6V6
100k / 10k pair to PI grid
6V6
100k grid leak
Rk 200 ohms
470k NFB from 6V6 plate to 6SN7 plate
No grid stoppers or screen resistors
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