Forums - Trouble with Right channel cutting out

Geno

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Pearl, MS

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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SE84UFO(Balanced Monoblocs) or Sansui AU222
Cambridge CXN(ModWrt)
SL1210 MK5(KAB Mods) London Decca Maroon cart • Darlingt.Labs MP8b
Otari MX5050-Bii2
ZLC Pwr cond.
Lii Audio PT-10 or F-12 or Betsy Alnico 8"/ W-15 in Open Baffles
Ordered: Altec Valencia's

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ZYGI

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Posts: 758
Hudson, North Carolina. USA

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 Offline 8+ years with Decware gear and Loving it!!! Posts: 775 Lakewood, CA.	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!
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 Share: Likes:

Geno Seasoned Member Online Without music, life would be a mistake. Posts: 2311 Pearl, MS	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	SE84UFO(Balanced Monoblocs) or Sansui AU222 Cambridge CXN(ModWrt) SL1210 MK5(KAB Mods) London Decca Maroon cart • Darlingt.Labs MP8b Otari MX5050-Bii2 ZLC Pwr cond. Lii Audio PT-10 or F-12 or Betsy Alnico 8"/ W-15 in Open Baffles Ordered: Altec Valencia's IP Logged Share: Likes:

4krow Seasoned Member Offline IMAGINE WHIRLLED PEAS Posts: 1683 powell, wyoming	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

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Online

Without music, life
would be a mistake.

Posts: 2311
Pearl, MS

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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SE84UFO(Balanced Monoblocs) or Sansui AU222
Cambridge CXN(ModWrt)
SL1210 MK5(KAB Mods) London Decca Maroon cart • Darlingt.Labs MP8b
Otari MX5050-Bii2
ZLC Pwr cond.
Lii Audio PT-10 or F-12 or Betsy Alnico 8"/ W-15 in Open Baffles
Ordered: Altec Valencia's

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4krow Seasoned Member Offline IMAGINE WHIRLLED PEAS Posts: 1683 powell, wyoming	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 Share: Likes:

Geno Seasoned Member Online Without music, life would be a mistake. Posts: 2311 Pearl, MS	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	SE84UFO(Balanced Monoblocs) or Sansui AU222 Cambridge CXN(ModWrt) SL1210 MK5(KAB Mods) London Decca Maroon cart • Darlingt.Labs MP8b Otari MX5050-Bii2 ZLC Pwr cond. Lii Audio PT-10 or F-12 or Betsy Alnico 8"/ W-15 in Open Baffles Ordered: Altec Valencia's IP Logged Share: Likes:

Ace-Tone Seasoned Member Offline 8+ years with Decware gear and Loving it!!! Posts: 775 Lakewood, CA.	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 Share: Likes:

Geno Seasoned Member Online Without music, life would be a mistake. Posts: 2311 Pearl, MS	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	SE84UFO(Balanced Monoblocs) or Sansui AU222 Cambridge CXN(ModWrt) SL1210 MK5(KAB Mods) London Decca Maroon cart • Darlingt.Labs MP8b Otari MX5050-Bii2 ZLC Pwr cond. Lii Audio PT-10 or F-12 or Betsy Alnico 8"/ W-15 in Open Baffles Ordered: Altec Valencia's IP Logged Share: Likes: