Re: POWER SUPPLY QUESTION

SET Asylum

Single Ended Triodes (SETs), the ultimate tube lovers dream.

In Reply to: POWER SUPPLY QUESTION posted by JAITI on March 19, 2007 at 04:51:53:

What is in the PS after the 680uF caps? Are the 680 caps in series, or in parallel? If you change them to 40uF, most probably you will get increased hum, unless you have strong downstream filtering. (Large Ls, Cs) You can try taking one of the 680 caps out if they are paralleled, and substitute it with a 40uF good quality cap. That way you'll still have 50% capacitance; you'll get by with that: if your amp is dead quiet now, it can be still very quiet after the mod. If you hear a soft hum, it can become an annoying hum. If you have a soft hum now, and change 2 x 680uF to 40 uF, you will have roof-shaking hum.
Good luck!

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Topic - POWER SUPPLY QUESTION - JAITI 04:51:53 03/19/07 (6)

Re: POWER SUPPLY QUESTION - SandroN 15:14:50 03/23/07 (1)

"If you replace the 680uF, you get a lot of hum." Maybe, maybe not. We've asked lots of questions... - jeffreybehr 10:45:47 03/24/07 (0)

Re: POWER SUPPLY QUESTION - Janos 23:54:13 03/22/07 (0)

Re: POWER SUPPLY QUESTION - elektron 10:18:46 03/19/07 (1)

Re: This is not true - Taz 13:32:07 04/07/07 (0)

A schematic diagram would help, but at first blush, reducing the PS capacitance to c. 6%... - jeffreybehr 09:20:02 03/19/07 (0)

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Re: POWER SUPPLY QUESTION - Janos 23:54:13 03/22/07 (0)

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