What I can't understand, from the schematic you linked, are the lack of fuses between the Xformer and the bridge rectifiers. Looks to me like a disaster waiting to happen. We add fuses in low voltage circuits like that to protect the transformer as the primary fuse rarely blows when a secondary bridge shorts out - at least the primary fuse doesn't typically fail until things have gone very wrong in the Xformer...
On our old tube amps, as used in jukeboxes, the practice was to turn off
the B+ for standby, this greatly reduced heat as well as wear & tear on components.
John :-#(#
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