[worrasf]

Hi all,
 
I completed a SOHA II kit from Glass Jar and all went well and sound is great. But recently after a few minutes the sound cuts out on both channels, he will cut in again spontaneously only for it to happen again. I guess it must be something in the power section not audio section. All the voltages checked out, have tried changing valves but no effect. Could anyone suggest what might be going wrong and how I can track down the fault and fix it?
 
Thanks in advance.
 
Steve

 

[KWS]

try to use another model of opamps for dc servor

 

[worrasf]

Thanks - any suggestions for a suitable opamp?

 

[KWS]

I faced the same problem be4 in my SOHA ii when using OPA627 so i tried back OPA134 and i solved all the questions.The main reason i think is the "too" high slew rate for some opamps such that it was too "sensitive" to compensate to the DC offset.BTW,try to let the output transistors warm up for awhile be4 u listen to it because the bias current related to temperature.Enjoy~