Hey all,
Just got a pair of ESL-63 and getting ready to look into problems. nothing but static on one and intermittent popping on another...
Anyway, first things first - looking for an easy way to check bias voltage to stators. I asked around at work to see if anyone had a voltmeter that goes all the way up to 5kv, - no luck (had to deal with all the "what the HELL are you trying to do with that 5kv" questions)
Anyway, I remember doing something similar on my Acoustat interface years ago where 5kvdc bias voltage was around 76vdc on a basic loaded voltmeter, and worked out OK, but not very accurate.
Another idea I had was to just pull interface power off a variac set to 1/5 of 120vac mains (24vac) and see if I get anywhere near 1kvdc at bias out... maybe a bit more accurate than my Accoustat 76vdc method?
BTW - go easy on me boys and squirrels, as I am just a dumb mechanical engineer...
Just got a pair of ESL-63 and getting ready to look into problems. nothing but static on one and intermittent popping on another...
Anyway, first things first - looking for an easy way to check bias voltage to stators. I asked around at work to see if anyone had a voltmeter that goes all the way up to 5kv, - no luck (had to deal with all the "what the HELL are you trying to do with that 5kv" questions)
Anyway, I remember doing something similar on my Acoustat interface years ago where 5kvdc bias voltage was around 76vdc on a basic loaded voltmeter, and worked out OK, but not very accurate.
Another idea I had was to just pull interface power off a variac set to 1/5 of 120vac mains (24vac) and see if I get anywhere near 1kvdc at bias out... maybe a bit more accurate than my Accoustat 76vdc method?
BTW - go easy on me boys and squirrels, as I am just a dumb mechanical engineer...
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