Output tubes burn-in

Whart, Years ago, a friend gave me a Weston milliamperes meter device. Connected to it is a "banana" plug that fits into the balance and bias ports on the Dual 75. I follow the biasing insturctions outlined in the ARC Dual 75 insturction manual. It works great.

I'm "Old School" and have owned this amp since it first came out. I've heard that ARC built only 130 of them.

Tpreaves, That's the problem with listening...once you hear/hit that "magic" sound, you always want it to be there. Isn't that what we audiophiles strive for in our listening?

Listen while you burn in. It won't make any difference. In most cases the results of burn in is small except for speakers. Enjoy
Alan

Thanks, Kisawyer. Yep, even back in the day, you didn't see those much.
I suspect the really early ARC stuff, including the Pelpoe(?) Industries equipment that WZJ first made, is extremely collectible these days. I owned alot of ARC stuff over the years, had the companion SP 3-a-1 preamp, then eventually went to the SP-10mkii preamp, which I used for a long, long time. Also a succession of amps, including D- 70mk ii, and Classic 60, all of which I used on my Quads. I kept the Dual 75 a for some reason, and used to use it in my home theatre system, which was at one point all tube amps. Kinda got warm watching a movie. :)
The company still makes really good products, and provides amazing support, with that mid-western sincerity that seems so out of place in NY- but I find kind of endearing.
I still have a bunch of older equipment that I eventually need to restore, including a pair of Quad II amps, a pair of vintage Decca ribbons and of course, my original Quad ESLs. Just a question of time, money and priorities.
Thanks for the info, and continue to enjoy your amp. I kinda liked the build style of the Dual 75, with that gap in the cage.

Whart, The ARC gear I have has been with me since about the early 70s. I have the D 75 and D51 amplifiers and the SP-1C preamplifier which was WZJ's first preamp, I believe. The original face plate it came with said "Electronic Industries." I later got the one I now have which says Audio Research (its a rack mount plate). I'd love to hear some of their new equipment, but now-a-days they are way out of my league.
Did you ever listen to the D75 with the speaker wires reversed from the normal connection? Their literature says the D75 (and the D51) was "an INVERTING amplifier - the output signal is 180 degrees out of phase with the input signal." From that statement I've always listened with the speaker wires reversed (at the amplifier) from the normal amp to speaker connection. The resulting sound is simply seductive. You hear more detail, delicacy, and atmosphere than you would ever hear with a standard connection. I asked ARC about this and they confirmed it saying some people preferred to listen to the amp that way. I wonder how many owners of that amp never really realized this and the potential it produced. I listen to it this way all the time.