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I have this problem that's been racking my brain for quite some time!
Just for experimental purposes, A 100w (@ 28v) amplifier is the test load! (50 to 60w would be plenty for this test)
The first test was using a 15vac 120va toroid, rectified and followed by a 22000uf 63v cap!
@ no load, I was getting a nice 24v
As I crank up the drive to the amplifier, Current steadily increased and voltage dropped to around 20v
All good and no sign of hums and buzz lol
The second test which I am scared to carry out would involve a 25vac 225va toroid, rectified and followed by a 22000uf 63v cap! However @ no load, This produces around 36v!
Although I know this voltage will decrease with load, Do I risk knackering the amplifier? lol!!