Musicians Roadhouse

hi all having a bit of hassle with my 4100DR ,it's going to marshall for a service as soon as i can fund it ,but today when playing i kicked in a tube screamer and the sound went real quiet ,i disengaged the pedal and the sound slowley crept back up ,i tried a few pedals and it did the same ,it was as if the amp was overloading ,and shutting it's self down a bit ,thats the only way i can discribe it,is this a known thing so i can get it working till service time.cheers

-- Tue Jan 24, 2012 11:20 pm --

c'mon guys ,what is it? ,pre or power valve? something else just give me a direction
steve any thoughts?

I'm not a tech, but checking the pre amp tubes would be easy. If you have a spare/new one that is.

Other than that, I can't be of any more assistance.

Never had an issue like that with my 900 MkIII though.

thanks for the tip someone else over on the marshall forum said the same, changed all the pre tubes so i'll just have to see when i try it again ,

You can try just changing their place also.