I build a DIY parafeed 6h6p headphone amp.
The problem is when I turn the power on there is a some sort of 50hz hum in one channel. I have done everything possible but the hum does not go away.
Other channel is 100% clear. I am using parafeed output transformers. Everything is grounded on one point.
Can someone help me whit this problem?
The problem is when I turn the power on there is a some sort of 50hz hum in one channel. I have done everything possible but the hum does not go away.
Other channel is 100% clear. I am using parafeed output transformers. Everything is grounded on one point.
Can someone help me whit this problem?
I did changed the lamps but the same problem. I changed all the lamps.
I use for rectifire 5u4g and gass shunt regulators followed by an anode choke.
I forgot to tell about the hum, that its a little bit louder when turn on but then in
5 sec gets a little quieter, the filling is that it will go away but no. This is only on one channel.
Adamus: I installed 90degrees, no effect at all.
I use for rectifire 5u4g and gass shunt regulators followed by an anode choke.
I forgot to tell about the hum, that its a little bit louder when turn on but then in
5 sec gets a little quieter, the filling is that it will go away but no. This is only on one channel.
Adamus: I installed 90degrees, no effect at all.
I assume AC filaments? are the wires to heater pins twisted (they should be) and routed away from signal wires?
wrap the tube in aluminum foil and ground it. If it works, buy a shielded socket.
An externally hosted image should be here but it was not working when we last tested it.
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