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One of the meters in my NYAL OTL3 has stopped working. I hope this is an easy fix.
I'm thinking of taking it to Roger Modjeski to look at; he could also check it over completely and see if the tubes need replacing too. Any advice from anyone here? rhinohifi, in particular?
Follow Ups:
I took my amplifiers in to Roger Modjeski on Monday and got them back yesterday. He tested them carefully, looking at the output tubes, meters, and capacitors. The output tubes on the misbehaving amplifier were in dire need of replacement; the other amplifier performed and measured well. I had a spare set of matched tubes I had bought from him some years back, and he put those into the bad amplifier. Those tubes matched extraordinary well, but he said the old tubes in the other amp were good enough. He readjusted everything on both amps and says they both perform well now. Rough specs: 115 watts into 16 ohms with less than .1% distortion. (I don't have frequency plots or much more detail). He said the old capacitors are still fine too. He made a clever set of probes to help safely access the closely-spaced testing points, which he said are otherwise very convenient.
Haven't had time to do that much listening yet, just a couple of hours with CD's (my tonearm needs tweaking), but I must say the system sounds incredibly magnificent. It is astonishing how long these amplifiers have lasted. I think the good amp got retubed once, and the other one never, since the eighties. I am incredibly lucky to have these amplifiers, and also that Roger is moving up here now just when they need servicing.
I doubt that it is the meter itself,it's probably an open resistor in line with the meter, does it not have deflection in any mode? bias or balance, or does it go to center when turned on?
I have a meter new in the box if it is in fact bad and needs replaced.
Thanks. I"m out of town now and so can't check. My recollection is that there is no
deflection, regardless of the position of the switch.
I've just checked the behavior of the meter. No deflection in AC or Bias mode,
but there is a slight move of the needle in Balance mode (to the centered balance position).
Any clue as to what this might be?
I'll try to take it to Roger as soon as I can,
Roger will know what need to be done-
Make sure that it is not a loose connection first-
Happy Listening
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