ADA Preamps > MP-1 Classic

MP-1 Classic tube channels problem

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Davide:
Hi everyone,
this is my first post here :)
My MP-1 Classic has a strange problem: the S.S. channel works like a charm, the tube ones (clean, brown and dist) not so much.
The dist at least has got some good level of volume: but I've to put the OD1, OD2 and Master at high level and the sound is not so distorted, it seems to get only a crunchy level.
The brown channel is the one that virtually doesn't work: I've to put the OD1, OD2 and Master at very high level to hear a bad and confused sound, with a lot of noise.
The clean channel has got a very low level of sound if I set the master under 9 (and over) and if I don't set OD1 and OD2 to very high values (around 9-10) I can't hear anything than a hissy and weak sound.
I already replaced the R151 resistor (as suggested by MarshallJMP  :bow: ) but I didn't notice any improvement in the sound: yesterday I noticed a small burning on the tube board below the vactrol U22 and I was wondering if it can be the reason of the problem... I hope you will be able to suggest me a solution, you are my very last hope  8) Thank you guys. Davide

Dante:
I'm interested to hear how this goes...my Classic has an issue with the Brown sound being lighter than it should be...I'm assuming it's on it's way to being where yours is now.  :dunno:

Either way, I'm keeping an eye on this post, until I have time to dive into my own Classic to see what's up

MarshallJMP:
I mailed you back, did you got a chance to try it out?

Davide:
Hey P, yes  ;D :thumb-up:

Dante:
and...?!?!? what happened?

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