I was tube rolling this morning and dropped in an old Amperex 12AU7 Bugle Boy and didn't like it so I dropped in it's brother.
It gassed up and flashed pretty bright and then I noticed I lost a channel. Pulled the headphone jack halfway out and got both channels.
Turned CrackPipe upside down and saw the left channel C4S board LED's not lit.
Put it on the bench, powered up and both C4S side lights came on then the left channel dropped off. So I figure it has to do with the 6080 warming up. I swap the 6080 and voila' everything is working famously (with a working 12AU7).
So the amp is okay but here comes the goofy part. I have a TV-7 tube tester and I take the 6080 and both Triodes test perfectly.
Any ideas?
John
It gassed up and flashed pretty bright and then I noticed I lost a channel. Pulled the headphone jack halfway out and got both channels.
Turned CrackPipe upside down and saw the left channel C4S board LED's not lit.
Put it on the bench, powered up and both C4S side lights came on then the left channel dropped off. So I figure it has to do with the 6080 warming up. I swap the 6080 and voila' everything is working famously (with a working 12AU7).
So the amp is okay but here comes the goofy part. I have a TV-7 tube tester and I take the 6080 and both Triodes test perfectly.
Any ideas?
John