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This amp cuts out after it has warmed up and occasionally blows the fuse.I checked it out and so far all I can find are some poor solder joints.I wonder about the marginal wiring-A connection is made at one tube and then daisy chained to the other 3.I haven't been able to find a schematic either.Anybody have experience with these? The tubes are very close to each other and it get real hot,I assume this is the cause of the problem.