Thanks to everyone. I appreciate the help. Before I got to your responses, I put the old tubes back in and realized the negative voltage was normal (push-pull amp, maybe?). So I got over that problem - felt a little stupid, frankly. I took Bifwynne's advice and paired up the tubes that were running high voltage, this got things much closer. But I am still running a bit out of spec on one pair of tubes -- the other three pairs are within spec. I am at 63 mv (instead of 65) and 78 mv on the corresponding slave (instead of 72 max). I took a chance and fired up the amp and it sounds fine. I thought I would run it for a few hours and see if things improve. I got the tubes from a guy on A-gon who had some spares, and he claimed they were matched quads -- they certainly were new. But perhaps they're not as close as they should be. They are KT-120's. So I saved a few bucks, but in the long run I may have made a mistake. I was not in the mood to spend almost $ 1K on the KT-150's, in spite of the all the word from you guys stating how good they are. Well I will let you know in a few days after I check it again. Maybe with more fiddling I can get them in spec. Is there any chance of damaging the amp by running it out of spec?
In case anyone is interested, I am running the amp to Rockport Mira's, and this is a marvelous combination.
Thanks to all....Scott
In case anyone is interested, I am running the amp to Rockport Mira's, and this is a marvelous combination.
Thanks to all....Scott