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In Reply to: RE: my bias is running away on one side even with the bias backed all the way off on that side! posted by immatthewj on July 22, 2020 at 21:13:50
Did you ever put all tubes from Right to the left side ?
If the tubes are unstable when moved to the left side some of them are broken and should be replaced.
If, on the other hand the tubes from the right hand when moved to the left are stable then you have a problem with the amp's right side.
If the tubes are to blame, get new matched sextet to the right side. Don't
save any of them as spares they will bite you later, junk them !
Sorry, I probably could have simplified my post/question by about ten times if I would have simply typed that the bias is running away on the RIGHT SIDE ONLY (regardless of which tubes I put in the right side--in other words not following the tubes). Not only that, this is happening with the bias for the right side backed all the way off.
Could be a leaky cap, could be broken bias pot or cap.Open up
and start measuring, you probably not need any powertubes installed to
pinpoint the fault.
However, tubes that has redplated are no longer reliable, do replace them!
Thank you, TubularWell.
I was wondering, myself, if it was the bias pot, as normally when the bias pot is backed all the way off, it needs quite a bit of screwing in until you start to see current coming up on the multi-meter. (As it is, very shortly after I turn the amp on, with the pot backed all the way out, current starts coming up & & rising in a hurry.)
I was going to try a call to Cary after 1PM today & go from there.
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