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In Reply to: RE: Diode bridge posted by Lew on January 20, 2015 at 20:24:55
The only advantage I can think of is heat dissipation is easier to manage on a single diode versus an encapsulated bridge. In fact I don;t think they even make bridges over 50 amps?
But diode heating should not be an issue in tube amp B+ supply as the current is typically less than an amp.
Discrete standard diodes versus a bridge in a 60hz rectifier application sounding better makes no technical sense.
Now if we are talking faster discrete diodes vs a bridge that could make a difference in voltage drop as well as switching noise.
Follow Ups:
I think what I have experienced and what Awedie also mentioned is the fact that if one uses discretes one typically chooses "better" diodes than the those incorporated in a typical silicon bridge, which is probably why discretes have always sounded better to me.
But what I am trying to get my head around for the benefit of all here is what makes a "better" diode?
Now the more experienced folks here all know about Schottky, silicon carbide, and UF series diodes. These can make improvements.
But simply tearing out a bridge and replacing it with four 1N4007 diodes hardly seems plausible. 1N5xxx can carry three amps versus 1 amp but for a tube amp B+ at 200ma average this is gross overkill.
Just trying to control the spread of fokelore. If someone wants to replace their bridge with single diodes, they should know something about diodes and not just "follow the crowd".
All of the above that you mentioned are what I consider "better" diodes, and I CAN hear the difference. It's not a night and day difference; it's a smidgeon of difference.
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