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Need help on FRED diode voltage rating

12.83.93.230

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Mikew16

I have an ASL AQ1003 integrated tube amplifier that I would like to replace the standards diodes with FREDs. The FREDS I have are rated at 8amp, 600volts. The output of the bridge rectifier is 410volts. Am I cutting it a little to close or are these fine to use?
Thanks for any help

Follow Ups:

The ones you selected are loo low in voltage rating... - Gepetto 07:28:34 12/27/02 (3)
If you are producing 410 V out you need at least 820 V peak inverse voltage (PIV) rating which these FREDS will not do. Get diodes rated at 1000V for your application so you have some margin.
G.
Crank it up...
- Re: The ones you selected are loo low in voltage rating... - Jim McShane 10:22:10 12/27/02 (1)
  He can use two diodes in series, then he has a 1200 volt "FRED". That's all the 1200 volt version is anyway - two diodes in one package.
  - Jim's Citation Amp & Vacuum Tube Pages
  - 2.8 xthe mains rail---1200V Jim's right. - wheezer 20:29:05 12/27/02 (0)
    Try the HiPerDYN rectifiers (sp)
    DSEP30-12CR
    you can go lower in the A rating
- I found some - Mikew16 07:47:17 12/27/02 (0)
  G:
  Thanks for the information. I have just found some rated at 1200V/6amps. The problem is they are so large that I don't know if they are going to fit. I will tear the amp down and try to squeeze them in. Thanks again for confirming what I suspected on the FREDs.
  Mike

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