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In Reply to: RE: 5R4G and 5U4G condenser output value posted by DAK on January 21, 2017 at 11:55:04
what comes after the first cap is important. If you go 10uf to a 10 ohm resistor to a 100uf cap it will blow up. You need to have an adequate choke or resistor after the cap. PSUII can give you some kind of indication of acceptable loading.
C1 is 12uf Sprague VitQ to 6H to 40uf Panasonic DC link to 8H to C3a and C3b (100uf ASC 386) one feeding channel A and the other feeding channel B. The power supply sounds very dynamic this way with excellent percussion. The residual AC is .1 to .2 volts.
With the 5R4 the music seems slightly smoother than with a 5AR4.
I would have preferred choke input but the power trans did not have enough high tension for that.
The reason it appears smoother with the 5R4 is because you are lowering your B+ with the 5R4 and therefore lowering peak power and raising distortion.Put the two tubes in and measure your comparative B+ at the first cap and the output stage.
Also,if there is a 12UF Vitamin Q for that first cap,leave it alone.I didn't realize you had two monstrous chokes.It reminds me of my Pedersen KT66 amps which are fantastic and I only have a 6uf VitQ off the 5V4 going into a pair of chokes.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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