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EQUIPMENT FORUMS >> SE84UFO >> Trouble with Right channel cutting out
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Message started by Geno on 05/06/18 at 19:31:53

Title: Trouble with Right channel cutting out
Post by Geno on 05/06/18 at 19:31:53

My right channel has started periodically cutting out. At first, I thought that I had a tube going bad. A few times, I just cut the amp off and back on and it was fine. Then I realized that when it happens, all I have to do is lightly touch the amp on top front and it comes back on.

I don't have any isolation under my speakers or components. Could vibration be causing this?

Title: Re: Trouble with Right channel cutting out
Post by ZYGI on 05/06/18 at 20:49:15

Geno,

Have you tried swapping output tubes from side to side? Or changed out the input tube with a spare? (we all know we need a spare set of tubes)

When you say "touching the are you getting a static discharge at the same time?

I'd also go ahead and work all the switches, cycling them a few time might help. Check that all connections are tight on both input RCA's and speaker terminals.

Hope you find the issue.
Zygi

Title: Re: Trouble with Right channel cutting out
Post by Acetone on 05/06/18 at 21:54:47

Check the tube pins. Dirty, or bent pins, might not be making good contact in the socket. wiggle each tube a bit next time it happens and see what's what!

Title: Re: Trouble with Right channel cutting out
Post by Geno on 05/06/18 at 23:03:59

Guys,

I have done all manner of tube checking. I think I am satisfied that it’s not a tube issue. Wouldn’t The fact that I can lightly put one finger on the body and have the channel come back on tell us that it’s either some kind of electrical interference or vibration problem?

Title: Re: Trouble with Right channel cutting out
Post by 4krow on 05/07/18 at 01:13:54

I would forget the tube trouble idea. If you are just touching the chassis and the right channel comes back on, it would indicate a cold solder joint or similar issue inside of the amp. It Might possibly be the tube socket itself, but either way, it is something that has to taken apart and repaired.

Title: Re: Trouble with Right channel cutting out
Post by Geno on 05/07/18 at 02:36:37

4krow - a cold solder joint is what a friend of mine suggested it might be. Anyway, just to eliminate everything else, I took all the tubes out and cleaned the sockets. Then rechecked all interconnects and speaker connects. If it cuts out again, I will send it back to be checked out. Thanks to all above for your suggestions.

Title: Re: Trouble with Right channel cutting out
Post by 4krow on 05/07/18 at 03:13:21

Geno,

Your doing this the right way. Easy things first. Then see what happens.

Title: Re: Trouble with Right channel cutting out
Post by Geno on 05/10/18 at 18:10:02

Knock on wood, after I cleaned the amp real good, it has done fine for about 12 hours listening or so. I did swap the output tubes around too, although I had tried that before. May have been as simple as a bad contact on one of the tubes. Fingers crossed that I don’t have this issue again.

Title: Re: Trouble with Right channel cutting out
Post by Acetone on 05/16/18 at 17:23:46

Speaking of cleaning. It's time I got out the Caig Deoxit and cleaned all my connections. It's been over a year!
Gino, does touching your unit still make a difference, or is all completely normal again?

Title: Re: Trouble with Right channel cutting out
Post by Geno on 06/30/18 at 05:11:22

Ace, I’m sorry I haven’t responded. I just saw your post. After cleaning the amp and swapping output tubes around, it has not happened again. Thanks for mentioning cleaning the jacks. I have not done that yet and my amp is a year old now. Geno