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In Reply to: RE: Increase L in pi network posted by Sidewinder on September 22, 2017 at 00:15:20
Do you have too much B+ ripple?
Typically you want just enough filtering to make an amp acceptably quiet. If it is quiet, adding more filtering is not usually good for sonics. If you are using high quality caps and chokes, bigger ones are way more expensive.
If you have hum, most of the time it is not from the B+ rail unless you are using a poorly designed filter.
FWIW, A filter of 40uf-4H-40uf-4H-40uF @ 100mA to 200mA will be quiet and good sounding. You can get reasonably priced 300mA rated chokes that will be mechanically quiet as well. For highish current power supplies, high inductance chokes are not always better sounding.
Follow Ups:
Hi C647,
I haven't measured the ripple, but I don't have audible hum. I use Altec 604s and only a slight hum is detectable at high volume. I'm just wondering if a better made choke and/ or higher value one would provide any sonic improvements. Your thoughts?
Regards,
David
but adding more inductance than necessary in B+ filter ain't one of them. If your better made choke has lower DCR, it will usually mean that it is higher rated in current for a given inductance. Swapping a choke with lower DCR will usually increase the B+ voltage, so you have to watch out for that.
Improve the quality of your power supply capacitors, replace electrolytics with films, this may result in an improvement in sonics.
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