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NYAL OTL3 meter

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Posted on March 25, 2015 at 09:24:35
airheadair
Audiophile

Posts: 393
Location: California
Joined: October 18, 2010
 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?

 

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RE: NYAL OTL3 meter, posted on March 25, 2015 at 13:19:24
6bq5
Audiophile

Posts: 4393
Location: SF Bay
Joined: August 16, 2001
 Roger will know what need to be done-
Make sure that it is not a loose connection first-

Happy Listening

 

RE: NYAL OTL3 meter, posted on March 26, 2015 at 20:11:13
rhinohifi714
Audiophile

Posts: 174
Location: oklahoma
Joined: June 13, 2009
 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.

 

RE: NYAL OTL3 meter, posted on March 27, 2015 at 17:47:06
airheadair
Audiophile

Posts: 393
Location: California
Joined: October 18, 2010
 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.

 

RE: NYAL OTL3 meter, posted on March 29, 2015 at 20:57:34
airheadair
Audiophile

Posts: 393
Location: California
Joined: October 18, 2010
 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,

 

RE: NYAL OTL3 meter, posted on April 17, 2015 at 08:29:45
airheadair
Audiophile

Posts: 393
Location: California
Joined: October 18, 2010
 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.

 

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