Hi,
first of all, yes I have searched the forum, but didnt find the same symptoms I have.
I have built my first stereo Aikido preamp with 4xECC88.
My PS is SS rectifier then split for each channel: 47uF, 120 Ohm, 440uF to preamp.
According to Duncan PS Designer I should have audible ripple, which I have when I turn the volume on poweramp up high. Turning the volume on Aikido causes no change in hum. BUT when I disconnect the 100nF cap coming from B+ and going to the tube output stage grid to cancel the PS noise/hum I get LESS hum. Why is that? I thought the Aikido should remove any hum/noise coming from PS supply.
I aim waiting for my chokes to arrive so I can replace the 120 Ohm power resistor with them. Then I will have NO ripple coming from PS supply, so disconnecting the 100nF is not problem.
Is 100nF required for the Aikido sound? Or it is just there for the hum canceling, which doesnt work for me?
Thank you.
first of all, yes I have searched the forum, but didnt find the same symptoms I have.
I have built my first stereo Aikido preamp with 4xECC88.
My PS is SS rectifier then split for each channel: 47uF, 120 Ohm, 440uF to preamp.
According to Duncan PS Designer I should have audible ripple, which I have when I turn the volume on poweramp up high. Turning the volume on Aikido causes no change in hum. BUT when I disconnect the 100nF cap coming from B+ and going to the tube output stage grid to cancel the PS noise/hum I get LESS hum. Why is that? I thought the Aikido should remove any hum/noise coming from PS supply.
I aim waiting for my chokes to arrive so I can replace the 120 Ohm power resistor with them. Then I will have NO ripple coming from PS supply, so disconnecting the 100nF is not problem.
Is 100nF required for the Aikido sound? Or it is just there for the hum canceling, which doesnt work for me?
Thank you.