Leak Stereo 20 hum and buzz problem

[M Gregg]

Swap them again!

 

[ifsixwasnine]

Put it in the right channel the valve is quite again. valve socket me thinks?

 

[ifsixwasnine]

but as you can tell i'm no expert!

 

[M Gregg]

I have to go!

Let me know what you find! Hope this has helped you. I will check back later.

Best regards
M. Gregg

 

[TheGimp]

Get some contact cleaner, clean the contacts, and retension the pin sockets.

 

[M Gregg]

In order of easiest:

If you have a spare tube try replacing V2 left. Then swap left and right see if the fault returns.

Check carefully for a broken connection where the socket connections go into the insulator.

Sometimes tube socket contacts can break inside the socket "you can not see this".

If you still have the fault change the socket!

If fault persists change C3.

Regards
M. Gregg

 

[M Gregg]

Get some contact cleaner, clean the contacts, and retension the pin sockets.

Old tube sockets nice arn't they🙂 If you have a crack in the socket it might be arcing/leakage between pins just a thought!

 

[JBCobra]

I had a hum like that on my st20. Turned out that the transformer bolts need tightening!