Hey all, been away from amps/Ampage for a while, hope all is well with all y'all. A friend of mine brought me a Crate Vintage Club 50 that crapped out on him mid song. He recently replaced the 10 year old extremely microphonic EL84s with a quartet of Ruby Tubes. I opened it up and it's blown the 1/4 amp fuse on the B+ Here's the schem for the VC30 (all I could find, looks pretty close):
http://www.schematicheaven.com/newam...2_poweramp.pdf
With no signal it's only drawing .13 amp on the B+. Are the Ruby Tubes drawing more than the old Sovteks at some point? The old 84s have some interesting scorch marks on the glass, could running these things at the edge of thier envelope for too long have whacked other component values (haven't really gone there yet...)? He tells me it pooped out while he was playing so that seems to eliminate a spike upon kicking in the B+. Haven't got a 1/4 amp fuse here, gotta pick those up tomorrow, but it seems fine with the meter in there. I dunno, I'm scratching my head. Any ideas? Again, hi to all, hope to hear back.
Dave
http://www.schematicheaven.com/newam...2_poweramp.pdf
With no signal it's only drawing .13 amp on the B+. Are the Ruby Tubes drawing more than the old Sovteks at some point? The old 84s have some interesting scorch marks on the glass, could running these things at the edge of thier envelope for too long have whacked other component values (haven't really gone there yet...)? He tells me it pooped out while he was playing so that seems to eliminate a spike upon kicking in the B+. Haven't got a 1/4 amp fuse here, gotta pick those up tomorrow, but it seems fine with the meter in there. I dunno, I'm scratching my head. Any ideas? Again, hi to all, hope to hear back.
Dave
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