can anybody help with a broken VH4s?

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locoed

locoed

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i just spent my last dollar to buy a used VH4S,i drove to chicago from detroit in a blizzard day before yesterday,14 hours in a car.
anyway,when i got to the guys house he plugged the amp in and i made sure all the channels worked,and everything seem to work
fine,i played with it yesterday for a minute and it was breaking up,sounds like a bad guitar cable,static,fading in and out,i changed all the cables and i still have the same problem,i put a quad matched set of tubes in it and still the same problem,ive done pretty
much everything i can do,ive been using mesa amps since 1988,so im not a newbie.does anybody have a suggestion? im at my wits end and im ready to go flip mode.
 
Don't flip just yet! The Diezel boys will come to your rescue soon enough....

But, for my money, check the preamp tubes that run common to all channels - this would be V1, V4 and V7 (PI). Snow and moisture may have worked its way in or something came loose in transport. Pull V5 or V6 to use as a test tube in V1, then V4 then V7.

Steve
 
That sounds like tube problem to me, unless your cables are fucked up. Plug your guitar into your serial returns & check if the problem is still there. If not start checking your preamp tubes. Otherwise try another set of power tubes.
 
i did,i replaced 1,7 and last one,still sounds bad,hard to describe,one min it sounds fine,then it starts to lose its tone,like somebody cut his balls off,then it goes back to normal.
 
dude, it sounds like your Vh4 is doing the same mine is doing, and I have to send it to Peter


is it only doing it in one channel?
 
somebody had the bias switch set to EL 34's,would that make it dip out???
 
i replace the tubes yet again,the noise went away,but now it sounds like its clipping,as in no saturation,no sustain,anybody else have this problem?
 
After you flipped the switch and changed the tubes, did you bias the amp?
 
no i put the old tubes back in it,in the same order,it still has a weak sound,like no saturation.i wanna send it to be repaired.
who does it? you?
 
i e-mailed Peter,he called me back but i was outside blowing snow,i'll pm you.
 
You should be able to plug your guitar directly (or through a pedal or external preamp)
into each side of the stereo effects loop return and see if you get a good clean sound
through the speaker on each side. If you get a good sound, your problem is in the preamp section. If not, its in the power amp section.
 
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