Joined: Wed Sep 09, 2009 7:41 pm Posts: 57 Location: Joliette, Québec, CA
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Hi everyone,
I got a problem with my plexi V6. It seems that my sound is not very good. I got a bad distortion if i push the gain all the way up. And even when the gain is not so high, the sound is not great. And the tone stack don't seem to have great influence on the sound. The other channel exibit similar distortion. Same thing if i switch the EL84 Tubes or the 6V6 ones.
I have tried the amp with another speaker cab, same problem. I have substituted the tubes one at a time, same thing. The only tube I haven't changed is the EZ81 for the lack of spare.
When I first build the amp, i made a mistake and inverted R15 470 ohms and R18 470K ohms. Apparently it didn't seem to have burn some component. Since then, I have verified all component to be at their right place.
Any idea where i should check ?
The voltage seem a little low but i am not sure.
Mains 118 VAC
B+ before VRM 337
B+ after VRM 335
V1 (Tung-Sol 12AX7)
pin1 138
pin3 0.86
pin6 138
pin8 0.88
V2 (Tung-Sol 12AX7)
pin1 148
pin3 1.12
pin6 243
pin8 149
V3 (Tung-Sol 12AX7)
pin1 183
pin2 53
pin3 81
pin6 182
pin7 54
pin8 81
V4 (TAD EL84) (When selected)
pin3 12
pin7 322
pin9 308
V5 (TAD EL84)
pin3 12
pin7 320
pin9 308
V6 (RFT EZ-81)
pin1 288
pin3 335
pin7 288
V7 (TUNG-SOL 6V6GT) (When selected)
pin3 322
pin4 315
pin5 .147
Pin6 .147
Pin8 20
V8 (TUNG-SOL 6V6GT) (When selected)
pin3 322
pin4 315
pin5 .260
Pin6 .260
Pin8 20
Thanks for your suggestions.
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