In Reply to: RE: Mike, that output stage supply operates at only 125VDC posted by Cousin Billy on March 13, 2014 at 04:18:54:
You should only be concerned about the voltage rating of those Mundorf caps as it relates to the fact they would blow up if you used them to replace the 27,000uF capacitors, because you need caps rated for at least 150V, 200V is safer, for this application. As we were saying, the supply produces 125VDC. At turn on, that voltage can transiently exceed 125V, so you need some head room above that. Hence, no less than 150V. Caps rated at 80V or 100V are not qualified.Go to Mouser Electronics website and see what are the largest values available for Panasonic TS series caps rated at 200V. As noted, I use the 2200uF value, seven of them per phase, but perhaps they make them in larger values so that you would not need to fit so many of them. (I actually wrote previously that they were "2000uF"value; I misspoke.) I also don't think you absolutely must have 27,000uF per phase worth of capacitance there. As noted, I am using half that total amount per phase (seven times 2200uF), and the bass response is without fault in terms of low end extension and power.
Edits: 03/13/14
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Follow Ups
- RE: Mike, that output stage supply operates at only 125VDC - Lew 07:12:31 03/13/14 (19)
- Correction- the supply voltage is a little higher. - Ralph 11:48:52 03/13/14 (18)
- SUCCESS. Thank you everyone - Cousin Billy 16:08:57 03/16/14 (5)
- SUCCESS. Then a step backwards - Cousin Billy 17:56:45 03/17/14 (4)
- RE: SUCCESS. Then a step backwards - Lew 10:21:43 03/18/14 (3)
- just a FWIW - Ralph 12:14:45 03/18/14 (2)
- I guess you are suggesting - Lew 13:13:07 03/18/14 (1)
- not exactly - Ralph 13:27:31 03/18/14 (0)
- RE: Correction- the supply voltage is a little higher. - tyu 12:01:57 03/13/14 (11)
- Some of the older amps had lower voltages - Ralph 14:15:41 03/13/14 (10)
- My education continues - Cousin Billy 17:23:42 03/13/14 (3)
- an I raise the 200uF values simply by installing a film cap across each 100uF pair? - Lew 19:06:37 03/13/14 (2)
- RE: an I raise the 200uF values simply by installing a film cap across each 100uF pair? - Cousin Billy 04:15:06 03/14/14 (1)
- RE: an I raise the 200uF values simply by installing a film cap across each 100uF pair? - Lew 11:00:58 03/14/14 (0)
- I guess I measure about 132V, most days,... - Lew 16:32:52 03/13/14 (4)
- In the case of Billy's amps - Ralph 08:30:19 03/14/14 (3)
- Last Question? - Cousin Billy 10:02:10 03/20/14 (2)
- the downside - Ralph 10:44:01 03/20/14 (1)
- RE: the downside - Cousin Billy 13:08:36 03/20/14 (0)
- RE: Some of the older amps had lower voltages - tyu 15:58:52 03/13/14 (0)