Detredwings,
The amp is less than a year old, and has maybe 800hrs on the tubes, although I'm really guessing on the hours.
I didn't bias the replacement tubes, just popped them in to assess the hum situation. I guessed that that was why it sounded horrible, even though the hum disappeared.
When I put my own tubes back in (which the amp is biased for) it sounded good again, although the hum was back.
I hadn't tried swapping positions on the 12's, thank you for the tip.
If the hum can be eliminated completely by replacing tubes, doesn't that identify them as the culprit?
The amp is less than a year old, and has maybe 800hrs on the tubes, although I'm really guessing on the hours.
I didn't bias the replacement tubes, just popped them in to assess the hum situation. I guessed that that was why it sounded horrible, even though the hum disappeared.
When I put my own tubes back in (which the amp is biased for) it sounded good again, although the hum was back.
I hadn't tried swapping positions on the 12's, thank you for the tip.
If the hum can be eliminated completely by replacing tubes, doesn't that identify them as the culprit?