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RE: BB pellet tweak

Posted by JKT (A) on April 10, 2025 at 14:18:31

In Reply to: BB pellet tweak posted by ginov on January 4, 2025 at 20:44:05:

I'm going to get into the weeds a little bit here: Cap. input PSs draw current though the power transformer in short interval pulses. The secondary winding processes both winding capacitance and leakage inductance which form a resonance circuit. Those current pulses act like a hammer hitting a bell producing high frequency ringing. The circuit in the PS acts like a loop antenna radiating RF into the rest of amp (and probably out the power cord too). My conjecture is this: the box of BBs helps absorb some of that radiation. The better solution is to dampen the ringing at the source with a 150nF cap and an appropriately sized resistor in series across the secondary. I have tried the BB boxes in the past. With amps where the PS transformer has been snubbed the boxes don't provide any improvement. If you are interested in this topic cruise over to DIY Audio and search the PS forum for Quasimoto (The Bell Ringer).


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