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ARC CA-50 tube changing

Does any ARC CA-50 owner change their own tubes? If so, how do you bias the tubes? I've read comments that it's best to send the amp to ARC to get it done properly but I've had to bias amps before and I have a multimeter. There are no instructions for doing it that I can find. In fact, no user manual instructions. Anyone care to explain?
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Showing 2 responses by hifigeek1

hifigeek1
770 posts
 
Seeing as that is an integrated amp it might be a bit tricky as the board might be mounted vertically. This may make access the test points tricky. Do you see any bias pots? There should be at least one per channel.
hifigeek1
770 posts
 
Well that stuff runs at high voltage i.e. 420Vdc on the plates and screens. You can't just stick your hands in there. You need the proper probes to measure bias voltage drops. Make one wrong move and poof, the outcome will not be pretty. I would suggest to let an authorized ARC tech. take care of that for you. If the boards weren't vertical, you probably could have done it yourself
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