Forums - Trouble with Right channel cutting out

Geno

Seasoned Member

Without music, life
would be a mistake.

Posts: 2000

Trouble with Right channel cutting out
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?

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(2)SE84UFO(Balanced Monoblocs) OR Sansui AU-222
Crown sub amp
Cambridge Audio CXN(ModWright) • ZBIT
SL-1210MK5(KAB Mods) Soundsmith Aida MKll cart • Darlington Labs MP-7
Otari MX5050-Bll2 R2R
ZLC Power Cond.
Lii Audio PT-10/W-15 in open baffles

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ZYGI

Seasoned Member

HR-ONE

Posts: 757

Re: Trouble with Right channel cutting out
Reply #1 - 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

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All Decware amps and sources, Turning Point Audio speakers

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Ace-Tone Seasoned Member 8+ years with Decware gear and Loving it!!! Posts: 775	Re: Trouble with Right channel cutting out Reply #2 - 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!
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Geno Seasoned Member Without music, life would be a mistake. Posts: 2000	Re: Trouble with Right channel cutting out Reply #3 - 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?
Back to top	(2)SE84UFO(Balanced Monoblocs) OR Sansui AU-222 Crown sub amp Cambridge Audio CXN(ModWright) • ZBIT SL-1210MK5(KAB Mods) Soundsmith Aida MKll cart • Darlington Labs MP-7 Otari MX5050-Bll2 R2R ZLC Power Cond. Lii Audio PT-10/W-15 in open baffles IP Logged

4krow Seasoned Member IMAGINE WHIRLLED PEAS Posts: 1607	Re: Trouble with Right channel cutting out Reply #4 - 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.
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Geno

Seasoned Member

Without music, life
would be a mistake.

Posts: 2000

Re: Trouble with Right channel cutting out
Reply #5 - 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.

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(2)SE84UFO(Balanced Monoblocs) OR Sansui AU-222
Crown sub amp
Cambridge Audio CXN(ModWright) • ZBIT
SL-1210MK5(KAB Mods) Soundsmith Aida MKll cart • Darlington Labs MP-7
Otari MX5050-Bll2 R2R
ZLC Power Cond.
Lii Audio PT-10/W-15 in open baffles

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4krow Seasoned Member IMAGINE WHIRLLED PEAS Posts: 1607	Re: Trouble with Right channel cutting out Reply #6 - 05/07/18 at 03:13:21 Geno, Your doing this the right way. Easy things first. Then see what happens.
Back to top	Decware 34I.3 integrated amp/Forte' 3 bass amp/Velodyne SMS-1 bass mngmnt system/Decware ZOB speakers/Audio Nirvana 8" bass drivers/Xiang Seng DAC/ LR Audio Computer/Rega Apollo R CDP/Emotiva ERC3 CDP/BPT 3.0 power cond. IP Logged

Geno Seasoned Member Without music, life would be a mistake. Posts: 2000	Re: Trouble with Right channel cutting out Reply #7 - 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.
Back to top	(2)SE84UFO(Balanced Monoblocs) OR Sansui AU-222 Crown sub amp Cambridge Audio CXN(ModWright) • ZBIT SL-1210MK5(KAB Mods) Soundsmith Aida MKll cart • Darlington Labs MP-7 Otari MX5050-Bll2 R2R ZLC Power Cond. Lii Audio PT-10/W-15 in open baffles IP Logged

Ace-Tone Seasoned Member 8+ years with Decware gear and Loving it!!! Posts: 775	Re: Trouble with Right channel cutting out Reply #8 - 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?
Back to top	SE84UFO25, ZP3, Zstage, ZR2, ZSB, DM947, HERESY iii VPI-Traveler2 +SS Zephyr MKIIIes. Cambridge CXC. Schiit Bimby DAC IC's Audio Envy, Decware, RAC-PC's, Mapleshade Dbl Helix+Spkr wires & jumpers Blue Circle PLC FX2X0e, Herbies, GIK, PI Audio DIY treatment IP Logged

Geno Seasoned Member Without music, life would be a mistake. Posts: 2000	Re: Trouble with Right channel cutting out Reply #9 - 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
Back to top	(2)SE84UFO(Balanced Monoblocs) OR Sansui AU-222 Crown sub amp Cambridge Audio CXN(ModWright) • ZBIT SL-1210MK5(KAB Mods) Soundsmith Aida MKll cart • Darlington Labs MP-7 Otari MX5050-Bll2 R2R ZLC Power Cond. Lii Audio PT-10/W-15 in open baffles IP Logged