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Simply using the standby switch to turn off the rectifier valve *filament* supply. This is always a separate winding on the PT so it should always be possible to access. It's low-voltage across the contacts (even though not relative to ground) so the switch rating isn't a consideration. It will always provide the correct slow-start since it's exactly the same as what happens when an amp with no standby switch is turned on, and it will also avoid causing a flyback voltage in the PT since the rectifier will cool slowly - and it shouldn't cause a pop either, I don't think.
Has this ever been done before? I'm not aware of it, but I can't quite believe no-one else has thought of it.
@ecc83 @jpfamps @martinw @DJH83004 - comments appreciated .
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Just because I don't care, doesn't mean I don't understand." - Homer Simpson
No one has ever thought about it IC COS IT'S WEIRD! But like you I cannot see any problem with the idea.
Dave.
The only disadvantage I can think of with the filament switching is that switching from standby to on will mean a delay as the rectifier warms up - so the initial impression will be that the amp isn't working.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Just because I don't care, doesn't mean I don't understand." - Homer Simpson
There also maybe issues with approvals re switching the rectifier filament, however I suspect that is not insurmountable.
I've also thought about this, but not tried it.
If you want to mute the amp at the input you just pull the plug out halfway.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Just because I don't care, doesn't mean I don't understand." - Homer Simpson