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Turn on issue

45.20.190.36
Posted on January 3, 2017 at 15:51:27
RPMac
Audiophile

Posts: 377
Location: So. Mississippi
Joined: January 3, 2005
 I have a RCA 2A3 that makes a loud scratching pop at turn-on and some black marks on the inside of the glass at the top, but plays fine.
Should I be concerned?

 

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And though this recommendation has been beaten to death..., posted on January 4, 2017 at 10:12:48
Jonesy
Audiophile

Posts: 3156
Location: Winnipeg, Manitoba
Joined: September 1, 2005
Contributor
  Since: March 1, 2018
 as always, wouldn't hurt to clean the pins and socket. As well as tensioning the socket.

Cheers!

E


"I know just enough to get into trouble. But not enough to get out of it."




 

RE: Turn on issue, posted on January 3, 2017 at 16:45:48
Chip647
Audiophile

Posts: 2649
Location: The South
Joined: December 24, 2012
 It is arcing at startup and will completely short soon. If it shorts, it may take out your output transformer, rectifier, etc. Consider yourself lucky that you have yet to cause any permanent damage. If that does not concern you, then don't be concerned.

 

RE: Another tube, posted on January 3, 2017 at 20:07:40
RPMac
Audiophile

Posts: 377
Location: So. Mississippi
Joined: January 3, 2005
 Another tube cured the problem
Thanks guys

 

RE: Turn on issue, posted on January 3, 2017 at 18:23:52
DAK
Audiophile

Posts: 2712
Location: PACIFIC
Joined: August 8, 2010
 You should certainly try some new tubes to see if that cures the problem. If it behaves the same with the new tubes. Then the problem is with the amp. If you have positively ruled out your signal sources and ancillary equipment then the next step is to turn it on with no driver or splitter tubes but hooked up to speakers but use cheap speakers for the rest of the testing. If there is no noise then the problem is in the driver/splitter section of the amp. If there is still noise and if you don't have much experience with tube amps you should probably take it to a tech who would have more equipment and knowledge in determining the source of the problem.

 

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