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In Reply to: RE: How do I double the voltage on diodes? Parallel or series? posted by rick_m on August 21, 2014 at 13:38:27
Prolly best to get 1kV rated caps.
Good luck!
Follow Ups:
and probably cheaper to just get some 1.2Kv Schottkys and plug them in. I don't have suitable ceramic caps lying around, so I'd be putting in an order to mouser anyways.
Nevertheless, thanks for the info gents. Knowledge is always a good thing.
Regards
cleet.
I agree with Tom. For many years using a diode rated 2.5 times the PIV voltage reduces failures to about zero. This formula was originally found in Ham Radio Amateur Radio Handbooks regarding power supply design.
2 times the operating voltage for a bridge rectifier is the minimum value I would recommend too.
So minimum 3 MUR860's in series per leg, preferably 4? Alternatively two 1Kv rated schottskys? Either way I need some bypass caps.
High voltage schottkys (2Kv plus) are prohibitively expensive.
Why not use 2x low noise UF4007 diodes per leg? I hear no performance difference in-between other 'high-end' diodes and the UF4007. The ultra low residual diode switching noise is attenuated by the circuitry downstream anyways.
If you really want to overbuild the rectifier --- I'd think about full-wave bridge using one UF5408 per leg. You may get away with no bypass caps. Noise level from a UF5408 is pretty low.I have six in my 1968 Fender Bassman rebuild. Very reliable.
Good luck with your fix!
-----
Edits: 08/22/14
Well the idea was to change from a 5AR4 rectifier to solid state to allow myself to use a toroidal - cannot find any toroids with a 5v tap. And of course, not degrade sound quality in the process
But after considering having to series so many diodes and the cost of bypass caps I just went out and bought a new trans with a 5v tap and I'll use the 5AR4. Cost wise the toroid and all the caps and stuff will probably have cost as much if not more - and with my electronic skills, have resulted in a 911 call to put out the fire.
Moral of the story, sometimes a tube rectifier IS JUST more practical than solid state :-)
Thanks
Cleet
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