Right channel noisy. Help troubleshooting

[Paul Birkeland]

If you swap just the blue wires, you are changing the current loop for the output stage to include the other half of the pseudo dual mono power supply. 

[triode]

Thanks Paul

Yes, by swapping the blue wires, this swapped the choke, the 1.2k resistor, and the final filter Caps
Maybe I will try also to swap the choke's red wires and if noise still in the same channel, then definitely its the choke 

[triode]

Hi all,

Update : I swapped the choke red wires and it still in the same channel/choke. So its not the resistor and filter caps in the PSU. I guess I have a bad choke?

Thanks guys


 

[denti alligator]

Received my plate choke replacement today (thanks, Eileen!), swapped out the defective one and the amp, at first, had no sound in the right channel. I checked voltages, which were slightly low around 6, 21, 22 (51.7V compared to 56.something on the other side), but all else well, so I plugged it back in and …

… it works! And it sounds great! And there is no more noise!!

Thanks so much for helping me get to the bottom of this!

[triode]

That's great news.

I'm ordering my replacement now. Hope same result as yours

Thanks for this thread, I would have not expected that the choke are the source of the noise
 

[triode]

Hi all

Just an update :
Received plate chokes sometimes ago but was too busy. Finally this week I manage install them.
Noise all gone (for now, cross finger). Will have marathon music next weekend to further see if noise comes back and also break-in the chokes

As bonus, the new chokes also look better with end bells !!

Thanks guys