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In Reply to: RE: Dynaco / K40 PIO cap voltage effect on sound? posted by Tre' on March 15, 2017 at 19:15:02
the main/output coupling caps..
I guess you mean the coupling caps from the driver stage to the grids of the output tubes.
Is 400 volts enough?
When you first turn it on, the full B+ will be applied to the caps until the tubes warm up and start drawing current.
I would use the 1000 volt caps just for that reason.
Have Fun and Enjoy the Music
"Still Working the Problem"
the circuit designer/supplier, Roy Motram and Bob Latino of VTA, 400v is adequate to the purpose. But, as you point out, upping the rating would provide additional capacity/insurance.
Those caps look at about +225 VDC on the inner lead and about -40 to -50 VDC on the outer lead (depending on the bias setting). This is a voltage swing of less than 300 volts. A 400 volt rated cap here is more than enough to do the job.
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