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In Reply to: less is more posted by acres verde on September 8, 2006 at 11:44:30:
Your impressions are interesting. It may be that, due to space limitations, using caps of larger value is the most practical way to increase total capacitance of the LV supplies. Sometimes large value electrolytics don't sound as good as smaller value ones, all other things being equal. You may find that installing a larger number of the smaller value caps, so as to effect an increase in net capacitance without sacrificing the possibly greater speed of small caps, will give you the best of both worlds. Also, I highly recommend Paul Speltz's mod to the output supply (in the tweaks archives from the old ASOG website, if you can find it): he used a small value lytic right after the rectifiers (in this case say ~1000uF to 2000uF) followed by low value resistors, etc, so as to effect a CRCRC type filter, where the last C can be a bunch of caps in parallel for a very high net capacitance. This works very nicely on my amps and is "all good". R ranges from 0.1 to no more than 0.5 ohms, and you need to use them on both the positive and negative sides of the supply rails. Then there was Harvey Rosenberg's idea of using CLC type filtration on an M60, but in that case, L needs to be very low inductance, very low DCR, and very high current so as not to limit transient performance or cut down the plate voltage to the output tubes.
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Follow Ups
- Re: less is more - Lew 12:12:12 09/08/06 (2)
- Re: RC - Ralph 09:34:06 09/11/06 (0)
- Re: less is more - Satelliteman 00:30:50 09/09/06 (0)
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