Just looking at hifi collective's attenuators for balanced stereo.
I was thinking of a Sieben attenuator but make up with CMF/RN resistors.
Although initially I'll mount this on the input side, I would also like the attenuator switching able to cope with being put on the biased grids of the output section. So that would, ideally, be about 300V working voltage. The Sieben switches are rated at 200V.
Are there any attentuator make-before-break switches (32/48 step) that anyone has found with that can cope with 300V?
I was thinking of a Sieben attenuator but make up with CMF/RN resistors.
Although initially I'll mount this on the input side, I would also like the attenuator switching able to cope with being put on the biased grids of the output section. So that would, ideally, be about 300V working voltage. The Sieben switches are rated at 200V.
Are there any attentuator make-before-break switches (32/48 step) that anyone has found with that can cope with 300V?
Could you not DC-block the signal before the output grids? Then you'd only have audio voltage on the attenuator, making its selection easier?
I could put them driver side. B+ At the anode is 150-200V so thinking a little on insulation to ground and at startup where if the PP bias starts before the send B+ it could have the cap cause a split second HV difference. Just don’t want the contacts sparking over between the attenuators contacts.
Probably with initially using a pot then see what the startup/shutdown looks like. Probably overthinking it.