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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Nice question and great answer posted by Russ57 on February 1, 2007 at 15:13:25:
I am using Duncan's PSUD. Wonderful tool, and highly accurate.I've got a 5AR4 into a cLCLC power supply:
3.3uF -> 15Hy/60DCR -> 120uF -> 7.5Hy/30DCR -> 40uFThere is some 'ringing' when I model it in PSUD, with a 1mA current draw change (39mA vs 40mA). It is not critically damped, but underdamped.
It actually sounds BETTER when I reduce the middle cap to 20uF...which makes it even more underdamped...but I get weird in-out movements of the woofer much more regularly. They still occur, altho very uncommon, when I have the 120uF as the middle C.
And, there is a low-level 10Hz freq on the output, which causes some wobble in the woofers.
I'm trying to track down the source, and tie it back to my knowledge of how the entire circuit operates.
Sounds darn good as-is, tho...
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Follow Ups
- Duncans PSUD - Jayme 16:25:59 02/01/07 (3)
- Re: Duncans PSUD - Tre' 17:04:46 02/01/07 (2)
- Screen shot, the first 12.5ms. - Tre' 17:28:08 02/01/07 (1)
- What we need is.... - Tre' 17:31:36 02/01/07 (0)
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