I have a now fairly old Ming-Da MC845-AA, the version using 6SN7s as drivers for the 845s.
After a few minutes of use with any set of tubes one of the 845s seems to lose its heater current. That is the heater dims. Swapping the tubes around changes nothing, the problem stays with the same channel.
This amp has been in storage for a while, and as I recall it had started to do this before I needed to put it in store. I'd like to get it working properly again to use it as my main amp again. (It would replace an even older Yaqin MC10K EL84 based amp.)
After a few minutes of use with any set of tubes one of the 845s seems to lose its heater current. That is the heater dims. Swapping the tubes around changes nothing, the problem stays with the same channel.
This amp has been in storage for a while, and as I recall it had started to do this before I needed to put it in store. I'd like to get it working properly again to use it as my main amp again. (It would replace an even older Yaqin MC10K EL84 based amp.)
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