Download Peavey 5150 Preamp Tubes Background. Very good gain, tight deep bass, fat mids and silky top end with overall definition and brightness. Selected with balanced systems and recommended for guitar amps to improve overall response.
Guitar amplifier headit was 5150, now it's 6505!
Peavey 5150 overdrive pedal pcb. A tad rt080 7025wa for v1, three jj ecc83s, and a sovtek 12ax7lps with balanced triodes for the phase inverter (v4). Surely not all of the preamp tubes you are replacing are bad. Volume, gain, bass, mid, treble controls.