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Post by pre65 on Jul 16, 2014 14:47:36 GMT
I'm about to embark on a rebuild of my 833a power amps, and have invested quite a few beer tokens for upgraded iron, mains transformers and chokes.
The 833a filament is 10V @ 10A, and currently I am using a 12V @ 30A SMPS which is reduced to 10V by resistors and caps. It works quite well, but I feel sure a VCCS (voltage controlled current supply) would be an improvement.
Are any of you guys into this sort of thing ?
Any links to existing designs, or details of circuits that I could modify would be extremely welcome. 
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Post by pre65 on Jul 16, 2014 16:24:09 GMT
Delving further into the depths of Google, I found a post about using two Rod Coleman 10V @ 5A modules in parallel.
This might be a good plan B.
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Post by Deleted on Jul 16, 2014 20:31:12 GMT
I'm about to embark on a rebuild of my 833a power amps, and have invested quite a few beer tokens for upgraded iron, mains transformers and chokes.
The 833a filament is 10V @ 10A, and currently I am using a 12V @ 30A SMPS which is reduced to 10V by resistors and caps. It works quite well, but I feel sure a VCCS (voltage controlled current supply) would be an improvement.
Are any of you guys into this sort of thing ?
Any links to existing designs, or details of circuits that I could modify would be extremely welcome. I used to have an old ex Admiralty Valve PSU. It had a number of fixed outputs including 10V and one variable. Current rating was 30A. Inside were about six huge transformers, 2 5U4G's, 3 EL37's and a few other valves and so heavy it was a two man lift. I purchased it for peanuts on a whim, had it nearly ten years and never used it, sold it about 18 month ago. I don't know if something similar would suit your needs but they do crop up from time to time as I saw a similar PSU in kent auction house barely six months ago. |
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Post by pre65 on Jul 16, 2014 20:44:27 GMT
Thanks for the reply Andy.
My amps are monoblocks, so whatever PSU I end up with will have to be one of two. The PSU you describe might be too big to fit the space I have available.
The two filament modules in parallel is starting to look more attractive.
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