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In Reply to: How to diagnose which tubes need to be replaced posted by texanater on April 6, 2021 at 08:10:47:
If you know which tubes are for L/R channels, I would swap them over one at a time. If the noise carries over to the other channel then you've found the offending tube.
Only way to know if the tubes are 'good' is to test them with a tube tester, unless your pre gives indication of a failing tube. However if you don't have access to one, if all sounds okay then leave them be. I've had the same 12AX7's in my DAC for decades - pulled and tested them recently and both are still good.
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Follow Ups
- RE: How to diagnose which tubes need to be replaced - Rocket_Powered 08:33:38 04/06/21 (5)
- RE: How to diagnose which tubes need to be replaced - Alpha Al 17:47:38 04/06/21 (2)
- +1. Yes, unfortunately the final tube tester become the amp or pre-amp. - Mick Wolfe 08:55:00 04/07/21 (0)
- RE: How to diagnose which tubes need to be replaced - Mick Wolfe 08:49:31 04/07/21 (0)
- RE: How to diagnose which tubes need to be replaced - texanater 09:41:48 04/06/21 (1)
- RE: How to diagnose which tubes need to be replaced - Jonesy 11:41:42 04/07/21 (0)