Here the images of B1. If I short the input of F5 with any value resistors I hear hum. F5 without input, it is silence.
I do not have the ground in my house, but if I connect the ground, nothing changes.
Attachments
f5 has a closed ground loop over the input cinch and a ground of the power supply. You have to put the input RCA jack as close one to another and lead them with power ground lead to circuit board.
F5 is not without hum if you make short circuit between ground of the chinch. Connect one interconnect cable between left and right input and you have a hum
F5 is not without hum if you make short circuit between ground of the chinch. Connect one interconnect cable between left and right input and you have a hum
Put the signal cable like yellow line on picture https://www.dropbox.com/s/z29ggltseggyx59/DSCF0749r.jpg
-have you hum even with xformer out of case , as on picture ?
NO!
I have hum only with xformer in the case!!!
tnx for pointing obvious , at last ......
put xformer out of case , and connect it to amp case with umbilical
cap bank in amp case
EI xformer is having greater magnetic field than toroid one ......... and minimized amp case , as is yours , isn't overly helpful ......
I thought I had finished the job.
Ok, I'll take a hammer and screwdriver.
The sound is good but I think that the high frequencies are attenuated a little for me.
It 'ok 0.6 volts across R11 R12 for 4 ohm speakers?
Tnx
you can up Iq to point where you meet 35-40W dissipation per device or 55C at heatsink
whichever comes first
I think I damaged a channel. During the setting, adjusting p1 and p2, beyond a certain level can not achieve 0 volts offset output, and offset increases rapidly.
The other channel is ok.