Let's Get Technical > All PREAMP Tech Tips & Support
MP2 Instant Volume Increase
Hanneman213:
This problem repeated. I dont think that its a tube related problem. I changed both with 12ax7 Tung sol's in 04/2018 and I did not play too much since that date. I replaced them each other. But The problem continues.
When I am playing, the sound Instantly Increases like you turn up the volume or you press a tube screamer. Then it turns back normal levels and gain.
What the problem can be ?
vansinn:
Uh oh.. a very careful guess is one the vactrols controlling how various levels gets defined has gone bad.
No doubt MJMP will chime in on this.
MarshallJMP:
Does this happen on all voicings?
Hanneman213:
Good question. It did not come to my mind. I will check it at home. I use Warm Hi gain mostly. I will check it also in cleans.
Hanneman213:
I spent sometime to get problem again. Because it has an irregular timing. The problem is happening on crunch voicings. Sounds increases and decreases with a wavy motion.
And one more thing. The display screen can not be visible with a straight front angle. I can see it with like 45 degree angle from a side.
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