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Sorry, but I lack the ability to comprehend the basics of vacuum tube circuitry except that I know that I like the way tube gear sounds.Anyway, this question pertains to a Cary V-12 with six EL34s on each side with two separate bias pots & a single power supply & it is drinking out of a dedicated circuit (with nothing else on it).
My listening sessions run for around two to five hours & I have taken to checking & adjusting my bias at the end of each session. I have noted that one side stays solid (@ about 260 mA + or - a couple) while the other side has usually climbed about 10 mA. I know that 10 mA is not a big number, but does the fact that this is happening consistently on one side indicate that one of the six EL34s on that side are going south?
Thanks.
"The disinfectant, where it knocks it out in a minute, and is there a way we can do something like that by injection inside, or almost a cleaning. As you see it gets in the lungs!"
Edits: 11/17/20Follow Ups:
you notice an increase each time, and is it after each adjustment meaning a steady climb over time?
"so pervasively did they speak and yet they hardly uttered a word of truth"
"you notice an increase each time, and is it after each adjustment meaning a steady climb over time?"
Yes, I would say that sums it up.
We were cross posting; it came to me after I woke up this morning that I just need to swap the left bank of tubes with the right & see if this follows the tubes.
"The disinfectant, where it knocks it out in a minute, and is there a way we can do something like that by injection inside, or almost a cleaning. As you see it gets in the lungs!"
I've found that tube aging does require a higher setting to maintain bias. In my case, however, this is a gradual process over a period of years.
Does this happen every time you listen - where you are constantly cranking the bias on that side to maintain the proper value?
Thanks, Estat.
Actually it is the other way around--the bias is going UP about 10 mA on one side by the end of almost all listening sessions.
However, it was kind of a stupid premature question, & I don't know why I didn't think of this last night before I posted it (except that possibly it was because I had been drinking), but what I need to very easily do is to swap the left & right banks around & see if this follows the tubes.
"The disinfectant, where it knocks it out in a minute, and is there a way we can do something like that by injection inside, or almost a cleaning. As you see it gets in the lungs!"
If your current is increasing over time, that means your bias is dropping, which is why he asked if you were cranking it up (the bias voltage).
I thought that my question was clear: that it pertained to the amp's bias creeping UP & me adjusting the bias DOWN.
"The disinfectant, where it knocks it out in a minute, and is there a way we can do something like that by injection inside, or almost a cleaning. As you see it gets in the lungs!"
Maybe you should do what a friend of mine did and have a breathalyzer installed on each amp. In his case, he can't get past standby until he's over the legal limit. YMMV :)
Well, I don't work on my stuff (anymore), beyond setting the bias, when I've been drinking.
"The disinfectant, where it knocks it out in a minute, and is there a way we can do something like that by injection inside, or almost a cleaning. As you see it gets in the lungs!"
Nothing quite like working on high voltage supplies after several adult beverages :)
Nothing quite like getting zapped by 460VDC after several adult beverages either :)
Nt
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