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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Fisher X-100 Right Channel Fade posted by spons70ss on July 1, 2016 at 10:15:37:
First of all - thank you for the advice.
Second, an update - it may or may not be fixed.
I scrubbed all four 12AX7 sockets with a dental brush using 91% isopropyl alcohol and then used a safety pin to retension them. I also cleaned the tube pins with the alcohol.
After reinserting the tubes I got no right channel at all - even at startup. I wiggled the two right-channel 12AX7's and got some noise when moving the left one around, so I shut down an switched the two. The right channel came back on the next power-on and has not faded since in approximately a dozen turn-on cycles and as many hours of listening.
I'm thinking that if it fades again I'll have my tech replace all the 12AX7 sockets. That will be a bummer since he has a minimum 3-month backlog. But I don't mind sending him business since he is good young guy, is local to me, loves vintage tube gear, seems to know what he is doing, and does not charge an arm and a leg. He also thought that the problem might be due to a pin contact issue on the preamp tubes and advised me to wiggle and swap the tubes around if it happened again.
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Follow Ups
- RE: Fisher X-100 Right Channel Fade - spons70ss 05:50:50 07/03/16 (1)
- Great news but don't do what I did - airtime 07:57:40 07/03/16 (0)
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