Question, is there an imbalance only at low listening levels or when the volume is increased do both channels become equally as loud?
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The reason I asked is, if the imbalance occurs & is mostly noticeble at lower listening levels then 9 out of 10 times it is the volume pot which is not tracking both channels equally. I've owned preamps that did this & the fix was to replace the volume pot. This is not an expensive fix & only another suggestion to look into.
The other possibility is that the tubes are not matched within acceptable tolerences producing unequal gain.
Definitely not the tubes as I've checked and swapped them for others. The volume pot could most definitely be the cause. I notice that if I turn the volume up very slowly then the right speaker comes on first. Of course, as the volume is then increased it becomes more difficult to tell whether it continues to be louder. However, the image drifts to the right which is consistent with the right channel being louder, wouldn't you say? Also, my spl meter shows that the right channel is indeed louder at times.
Question: can a volume pot cause this problem to be intermittant????
Thanks for your input on this matter, no one has suggested it is the pot.
Randy, the problem I was having was at very low listening levels the left channel was off and the right was playing however when the volume was increased slightly, both channels kicked in with equal gain. This problem was consistant & not intermittant which makes me now wonder if your volume pot is the culprit unless the connection of the pot is shorted.