Mark III problem

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LeXXXa

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Joined
Jul 15, 2010
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Location
Minsk, Belarus
Hi everyone!
I've got a black-stripe Mark III head (rev, 60/100 watt, no-GEQ, export version tranny). Great amp it is, but there are some problems:
1) Reverb can suddenly disappear and reverb knob will start acting like a volume/gain knob. Volume and tone can jump suddenly too. I'm almost got used to hitting it on top (bad habit, but it works) - the volume/tone would fix. The biggest problem is that you can't say when it will happen again - one time it works for 3 hours just OK, the next time - jumps frequently. I've taken it to a technician, but he can't find what's wrong - he left it working for 4 or 6 hours, but this Mark just keeps working fine :shock:
2) On higher volumes it sounds too harsh - with master below 1.5 - 2 - everything is OK, but when dialing above 3 - too many highs.

Any advices?

PS. Sorry, English is not my native language so excuse me for the mistakes.
 

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