RE: cause of new rectifier valve burning out

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Posted by Tre' (P) on December 9, 2017 at 22:08:15

In Reply to: RE: cause of new rectifier valve burning out posted by tubular.well on December 9, 2017 at 13:45:07:

Yes, 900 volts CT with 620 ohms total HT winding, EZ81 rectifier (PRC rated at 500ma.), full wave, 50uf cap and 100ma. current draw.

Peak repetitive current.....370ma. 130ma. under max rating.

Change only winding resistance to 50 ohms total and the PRC goes up to 620ma. 120ma. over max rating.

Change only the current draw to 175ma. and the PRC goes to 920ma. 420ma. over max rating.

On the other hand change the current draw to 50ma and the input cap to 100uf and the PRC is only 370ma. 130ma under rating.

Note; Results according to PSUDII.

Tre'
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"Still Working the Problem"

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Follow Ups Full Thread

Topic - cause of new rectifier valve burning out - digda_beat 02:37:09 12/09/17 (15)

RE: thanks everyone - digda_beat 22:04:51 12/09/17 (0)

Also clean tube socket contacts and check solder joints. (nt ) - Jonesy 10:14:33 12/09/17 (0)

RE: cause of new rectifier valve burning out - REL54 06:32:28 12/09/17 (11)

+1 nt - Ralph 10:22:23 12/12/17 (0)

+1 (nt) - Tre' 09:33:25 12/09/17 (2)

RE: +1 (nt) - FenderLover 09:54:20 12/09/17 (1)

Good point - Tre' 12:23:06 12/09/17 (0)

RE: cause of new rectifier valve burning out - DAK 07:58:18 12/09/17 (6)

RE: cause of new rectifier valve burning out - Tre' 09:00:54 12/09/17 (5)

RE: cause of new rectifier valve burning out - tubular.well 13:45:07 12/09/17 (1)

RE: cause of new rectifier valve burning out - Tre' 22:08:15 12/09/17 (0)

Yes, of course. - DAK 09:24:35 12/09/17 (2)

RE: Yes, of course. - Tre' 09:37:10 12/09/17 (1)

Your replies are always a good thing and appreciated - DAK 10:05:15 12/09/17 (0)

RE: cause of new rectifier valve burning out - 6AS7_6SN7 03:20:23 12/09/17 (0)

Follow Ups

RE: cause of new rectifier valve burning out - Tre' 22:08:15 12/09/17 (0)

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