Hi Frank
What was the problem with the Ref 10 pre and phono? At 30k each I would have hoped nothing
Don't know. Performance degrades within 45 minutes of turn on in the preamp. I replace the 6550s and everything is fine......... for a while. I've been through 3 sets of 6550s in a month. They're sending another full set of tubes and I don't want to play any more. I've had problems in the past and don't wish to go through it again. Love the sound, don't love the headaches. My dealer is going to take them back. I'm sure he'll figure it out with the help of Audio Research. I'm not bad mouthing ARC. They're a good company and make great sounding equipment. I've just had very bad luck with them over the past 6 or 7 years.