AAEA Posted June 3, 2024 Share Posted June 3, 2024 So I did all the normal things to check. The power tubes that were in it were quite cooked and old so I replaced with the spec Electro Harmonix EL84 tubes and used the multimeter to set bias to 25mv. Still having the issue. Whats happening here: 1) power on, seems all good and normal; no noises or anything. 2) it lights up the channels and shows ready for use. no issues. 3) flip the standby to go, amp comes on as normal. 4) ***the issue*** after a little bit like 5-10 min playing the sound turns all the way off, if you switch the channels or options on the tube settings to pentode/triode or from AB - A or from channel A to B channel sound comes back on but again only for a little bit them sound turns off again. This is a recent thing the amp started doing. I thought that since the power section tubes were totally cooked and showed it that was probably the issue but now I'm running brand new tubes and still having the issue. any ideas? Quote Link to comment Share on other sites More sharing options...
psarkissian Posted June 4, 2024 Share Posted June 4, 2024 Power tubes are matched pairs? Could be the 12AX7 pre amp tubes are getting old as well. Old heater element in a pre amp tube can a reason. Something else,... have it checked out by a Line 6 authorized service center in your area. Quote Link to comment Share on other sites More sharing options...
AAEA Posted June 4, 2024 Author Share Posted June 4, 2024 All of the tubes are new. I did a reset to the amp and that has fixed the issue. Quote Link to comment Share on other sites More sharing options...
psarkissian Posted June 4, 2024 Share Posted June 4, 2024 Excellent. Quote Link to comment Share on other sites More sharing options...
GordenCook Posted September 28, 2024 Share Posted September 28, 2024 I'm having a similar issue on my DT25. I power it on and once everything is warmed up it sounds great. But then after 10 mins or so it will fade in and out. By this I mean the volume will gradually go down on its own and then come back to full strength after a few seconds. This repeats every 3-5 mins. I replaced all the tubes with the ones recommended on this forum by psarkissian and dialed in the bias correctly. Still no resolution. My question is - is this a known issue and an easy / low cost fix? Great if you can give me some insight on this as I want to determine if the cost to fix is worth it. Quote Link to comment Share on other sites More sharing options...
Fenderflame28 Posted April 3 Share Posted April 3 Hi AAEA I think I have the same issue - what do you mean when you say you 'reset' the amp? Thanks Quote Link to comment Share on other sites More sharing options...
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