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In Reply to: RE: Dynaco / K40 PIO cap voltage effect on sound? posted by Dingojazz on March 15, 2017 at 16:34:57
" (currently enjoying .22 uf 400v K40s at outputs)"
I'm curious what you mean by "at outputs"?
Can you be more specific as to where in the circuit you have these caps?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
the main/output coupling caps..
Thanks,
K.
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.
Tre'
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.
Thanks,
K.
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.
Bob
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