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Hi all, Ive got a 4500 model (head) I'm getting intermittent volume drops and can't figure out what's happening...
This model has a separate master volume for each channel but its happening on both which says to me it could be the power amp stage...
had a look at the valves (marshall branded EL34's for those who care) they're all glowing happily, Ive run it at 25 watts and tried 1 valve at a time,
tried with different leads, tried cleaning the pots and checked the entire thing for dodgy soldering/connections, tried wiggling leads at i/p n o/p, different cabs etc
I'm stumped and have an v important gig in about 21 hours or so and my only backups are a pod xt live through the PA or my mate's valvestate - nuff said eh?
On the plus side though its not half as bad once she's warmed up a bit but I can't gig it in that state - any advice/diagnosis???
This model has a separate master volume for each channel but its happening on both which says to me it could be the power amp stage...
had a look at the valves (marshall branded EL34's for those who care) they're all glowing happily, Ive run it at 25 watts and tried 1 valve at a time,
tried with different leads, tried cleaning the pots and checked the entire thing for dodgy soldering/connections, tried wiggling leads at i/p n o/p, different cabs etc
I'm stumped and have an v important gig in about 21 hours or so and my only backups are a pod xt live through the PA or my mate's valvestate - nuff said eh?
On the plus side though its not half as bad once she's warmed up a bit but I can't gig it in that state - any advice/diagnosis???
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