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In Reply to: RE: Anyone have experience with Audio Research VS-115 posted by StephenJK on July 26, 2014 at 12:30:50
I'm not familiar with the VS-115 specifically but....
Just curious.... what happens if you unplug the amp, unplug the power tubes, let it sit for maybe 1/2 hour.
Now instead measuring bias voltage (mV) try measuring resistance between each of the bias test points for each power tube.
What is the resistance for the 'good' locations vs the one or two that are 'bad'?
Is there possibly an open resistor in one or more locations?
Again, I'm not familiar with this amp but one thing you can try is to characterize component values around the good tube locations by measruing, then see if any of the components around the bad tubes are 'out of whack'.
Follow Ups:
V2 and V7 measure at 1.16, all the others from 1.21 to 1.22 ohms.
I'm guessing you were thinking a bad tube might have opened a bias resistor?
I don't have an issue with sending it out for repair. I am nervous of continuing to use the unit now that I know there's a problem. The outputs are with parallel tubes for each side, eight total.
With one side gone for one channel the power output will drop in half, but the last think I need is to blow up the amp or my speakers.
Yes, I was thinking possible open bias resistor but the value that you measured isn't that far off. Might be best to call ARC or an authorized dealer with good tech.
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