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In Reply to: Re: Diodes or Caps- which to change first posted by Dan W on January 13, 2001 at 08:56:26:
Thanks for your tip. I also see that a U.K supplier is selling Shottke diodes in a small bridge set up with the regular four connections to replace existing solid state rectifier bridges- this would solve my issue neatly with the diodes correctlt orientated.Hugh
Follow Ups:
Hugh,
I fully agree you must be careful when fitting diodes but it is not too extremely difficult. Just remember the two corners of a diode bridge:positive-cathode to cathode
:negative-anode to anode
Sonically superior in every way.
Hi:
I noticed this thread and since I have the ultra fast soft recovery diodes for my tube amp I have a couple of questions if you don't mind.
Doesn't the cathode in the first diode goe to the anode of the second diode? Also, on the heat exchange for the diode how do you know if it needs to have a heat sink? The diodes I have are Hexfred 15A 1200V Harris. I did not get any heat sinks with them. They will see about 410 volts and the unit uses a 2amp fuse.Thanks,
ja
John,I suppose you could state it that way. Here's how I remember it.
For a typical bridge rectifier like a (GBPC2506 wire lead) there are four corners Positive:cathode to cathode
Negative:anode to anode
AC:anode to cathode(AC)
AC:anode to cathode(AC)
Or take 2 Harris diodes and fit their cathode leads to positive on PCB then take 2 Harris diodes and fit their anode leads to negative on PCB. Now all four corners will match as above.
As for heat rating I am not too sure. I usually get appropriate diode value and heat sink only if previous bridge was heatsinked.
Hope this helps.Kyle
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