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In Reply to: RE: Why not use Schottky's? posted by wheezer on December 17, 2010 at 21:20:06
Is it worth the cost?
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Use these.
Is there some reason for a 200V bridge when the heaters are 6.3Vdc?
Four diodes can easily be wired into the four holes in place of a single bridge. I can send you pics offline if you wish.
I'm building a single ended EL84 amp from a project in Audio Xpress. It seems pretty simple (which is an absolute prerequisite, this being my first amp) and quite honestly, I'm going on faith. Yes, the diode bridge is for a 6.3V 12AX7 filament. Is 200V overkill? If I can safely use the 50V Schottkys, I'd be happy to (here I am going on faith again). Cheers.
Do you have the schematic for the heaters?
NTC's are a must as well.Preferably on the PT's secondary winding.
If it's multi stages, try to make the first C considerably smaller then the rest.
The voltage is not the issue. It's the current spike(s) with heaters.
6.3Vdc you'll have something like 9-11VacRMS. (RMS x 3) - you're fine.
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