SS rectifier for SimpleSE and others...

cjkpkg · 14th August 2010, 09:27 PM

I wanted to try SS rectifier for the SimpleSE since the FREDs blew up about a year and a half ago. I recently ordered Broskies PS-3 for the Aikido and he uses HER108's for the HV SS rectifiers. I had 2 left over and since they were rated at 1KW I figured what the heck? Downside is that they are rated at 1A...but since the Xformer only draws about 150mA I gave it a try. Worst case it blows a fuse.

So far it has been about 3 hours on the SimpleSE and plate voltage went from 455 to 499 with no hiccups and is still very quiet.

I know there were some issues with the IXYS parts - which I personally experienced - so I thought I would share a solution that so far is working nicely for me at least.

tubelab.com · 15th August 2010, 12:17 AM

With a 375 volt transformer the diodes will actually see about 1100 volts of PIV. This is why I like 1600 volt diodes which are hard to find. If your diodes work, use them but don't go over 2 amps on the fuse.

The issue is that on turn off some transformers will spike to 2500 volts for a brief instant. That zaps diodes that are not avalanche rated.

cjkpkg · 15th August 2010, 01:00 AM

Yes indeed...I am using 2A fuses on the amp. While I have built a few different amps for the main listening system I still go back to the SimpleSE as the benchmark.

Thanks George!
Carl

14th August 2010, 09:27 PM	#1
cjkpkg diyAudio Member Join Date: Aug 2008 Location: Roswell GA	SS rectifier for SimpleSE and others... I wanted to try SS rectifier for the SimpleSE since the FREDs blew up about a year and a half ago. I recently ordered Broskies PS-3 for the Aikido and he uses HER108's for the HV SS rectifiers. I had 2 left over and since they were rated at 1KW I figured what the heck? Downside is that they are rated at 1A...but since the Xformer only draws about 150mA I gave it a try. Worst case it blows a fuse. So far it has been about 3 hours on the SimpleSE and plate voltage went from 455 to 499 with no hiccups and is still very quiet. I know there were some issues with the IXYS parts - which I personally experienced - so I thought I would share a solution that so far is working nicely for me at least.

15th August 2010, 12:17 AM	#2
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	With a 375 volt transformer the diodes will actually see about 1100 volts of PIV. This is why I like 1600 volt diodes which are hard to find. If your diodes work, use them but don't go over 2 amps on the fuse. The issue is that on turn off some transformers will spike to 2500 volts for a brief instant. That zaps diodes that are not avalanche rated. __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.

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15th August 2010, 01:00 AM	#3
cjkpkg diyAudio Member Join Date: Aug 2008 Location: Roswell GA	Yes indeed...I am using 2A fuses on the amp. While I have built a few different amps for the main listening system I still go back to the SimpleSE as the benchmark. Thanks George! Carl

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