HT Stage 60 Channel 1 fault

[Liam1978]

My stage 60 channel one has failed, when channel 1 is selected its feeding back badly and is unusable, channel 2 and the clean channel are fine, so i obviously need to replace a valve, only problem is which one? ive looked in the back and all the valves are glowing so i cant diagnose a bad valve, anybody know which valves relate to only channel 1?

[majikmojo]

78....

i have the positions at home (i'm at work right now) - if nobody answers i'll have it for you in a little while

i cant remember off the top of my head and dont want ot mis - inform you....

[Liam1978]

78....

i have the positions at home (i'm at work right now) - if nobody answers i'll have it for you in a little while

i cant remember off the top of my head and dont want ot mis - inform you....

That would be great cheers

[majikmojo]

here you go:

the pre amp tubes are ordered in the following manor: furthest from the power amp tube to closest to power amp tubes are:

V1: 12ax7 (Ecc83)

V2: 12ax7 (Ecc83)

V3: 12au7 (Ecc82) this the closest pre amp tube to the power tubes, it is a phase inverter mainly governs the clean channel.

[Liam1978]

Cheers for that majikmojo, i can get that sorted today now thank you.