lost left chanel on Seduction

[denti alligator]

I'll swop tubes and I have another set, so I'll try these, too. But assuming it's still out after I've tried this what's the next step or two for finding the problem?

I should note that at first I thought it was the interconnect, since when I twisted it a little the sound came back, but then got crackly and for a few minutes was going in and out. I thought for sure it was these new right angle plugs I got. But then it stopped working, even without those plugs.  Tubes still glowing.

 

[Doc B]

Check the wire connections to the RCA jacks.

 

[denti alligator]

Not the tubes.

But now I'm really confused, because when I removed the right angle plugs it worked fine. Then I switched the right angle plugs, but no difference ... Weird. Then I removed them again and suddenly it didn't work for a few seconds, but now it does again.  WTF. The underside looked fine. Nothing loose.

 

[Grainger49]

Touch up the solder joints on the bad channel RCA jacks.

 

[denti alligator]

Definitely those right angle adapters. I've ordered some Audio Quest ones.