hey team!
trying to stay busy and keep working as the world burns....
and this stupid mesa triple rectifier is not helping my mood!
it has a weird hum (ground-esque) -
mostly on channels 2 and 3 but sliiight hum on channel 1, as well.
it stays, but quiet, if i pull V1 and goes away completely if i pull V2 -
its def in the preamp (half-split the amp, etc.) -
if i scope i see weird noise on pins 1, 7, 8, 6 of V3 that is totally not knob dependent - still there with knobs all the way down, and only the gain knob affects it. but if i cut out the previous part of the circuit, around V2, it goes away.
SO its clearly something around V2. i suspect some of the jfet/darlington muting stuff, but its gotten kind of hard to troubleshoot because i only have a dual rec schematic and it doesnt seem to match 100%.....
does anyone have a good triple rec schematic?
PS its not the preamp tubes i swapped em all and ive already replaced most of the Jfets and Darlingtons and smaller filter supply caps.....no change!
trying to stay busy and keep working as the world burns....
and this stupid mesa triple rectifier is not helping my mood!
it has a weird hum (ground-esque) -
mostly on channels 2 and 3 but sliiight hum on channel 1, as well.
it stays, but quiet, if i pull V1 and goes away completely if i pull V2 -
its def in the preamp (half-split the amp, etc.) -
if i scope i see weird noise on pins 1, 7, 8, 6 of V3 that is totally not knob dependent - still there with knobs all the way down, and only the gain knob affects it. but if i cut out the previous part of the circuit, around V2, it goes away.
SO its clearly something around V2. i suspect some of the jfet/darlington muting stuff, but its gotten kind of hard to troubleshoot because i only have a dual rec schematic and it doesnt seem to match 100%.....
does anyone have a good triple rec schematic?
PS its not the preamp tubes i swapped em all and ive already replaced most of the Jfets and Darlingtons and smaller filter supply caps.....no change!