Output tubes burn-in

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.

Kisawyer: Man, you are really one of the few! They should reserve a place at the museum for your system. The D-51 was a sweet little amp. I vaguely remember the SP-1, honestly can't say if I ever heard it. You are right, of course, that the products were branded Electronic Industries early on- somehow, I pulled 'Pelpoe' out of my, ahem, ear? I couldn't remember the connection with that name- I did a quick search and they bought him out early on, but I think that was really before ARC. You also know that some of his first amps were basically heavily modded Dynaco St 70's, right?
I doubt i ever inverted the leads- I used the amp with my old Quad ESLs (which weren't quite as old in 1974), and I think i just used the 16 ohm tap. I also vaguely remember something about a floating ground, but I may be misremembering that. It has been a while. I still have all the packing and literature that came with mine (I need to hunt for the screwdriver) so I will dig down when I retube. I need to replace the barrier terminals- they have had their barriers broken off since the 1970's when the amp was in active use- i just never got around to replacing them, and ordered new terminal strips from ARC which arrived yesterday, along with a new set of power tubes.
The company, as you know, went through a variety of 'sounds' over the years. They even introduced a failed solid state product at one point- i think they called it the 'analog module'- they were sealed modules on the circuit board that were 'like' tubes- I don't think that went very far. And of course, they had their 'white period' when the tube stuff sounded drier and less euphonic. I've heard the current Ref stuff and it sounded great on big dynamic speakers.

You should let the company know if they don't already that you are still running these pieces. It would be an interesting PR exercise for them to show an owner who has had their equipment for 40 years and still enjoys it.
That's very cool.

Whart, ARC does have a museum for their products. Anyone in the Minnesota area are told to stop in. I had mentioned to them on several occasions that I owned the SP-1C and they asked if I would send them pictures of it for the museum, which I did. It sounded like they were still working on what will be on display there, so no literature or photos of the place are available yet.
Here is another story you might enjoy. WZJ personally delivered the preamp to me and an audio friend in Milwaukee back in the 70s. We all three listened to it through my friends Bose speakers. We treated Bill to a prime rib dinner at my friends home to thank him for making the trip down and bringing the equipment. Those days are long gone!
Also, I remember going to a high-end audio store Chicago back then to hear ARC's Dual 100 amplifier. It was a monster, having two huge chassises and a large number of tubes.
Heard the story about ARC’s evolution experiment in sound over the years.
I've owned a Marantz 10B, (which I stupidly sold), had a pair of KLH Model Nines (which I stupidly sold), run by a Marantz Model 15. That never worked well, and made me a devoted tube man. Later, I owned the A&D mercury uni-pivot tone arm (which I....), and finally a pair of Infinity Servo-Static One speakers. The Infinitys’ were great, but they were made out of "bubble gum and tape." Sounded terrific when they worked. The company’s service at the time was horrible. Arnold Nudell had a great product, but very unreliable. I still have two pairs of them in non-working order stored away.
Try the amplifier/speaker lead reversal if you get your ARC amp running. I'd be curious to hear what you think.

You were really there. I remember the KLH 9- I grew up in Pittsburgh and the store which had the highest end stuff was Opus One. Tasso Spanos, the owner, was a KLH 9 devotee. (I think this was in the days of the Janzen tweeters) The 10B was, for me, the fish that got away- a friend promised to get for me, - one that had been on display at a showroom in NYC for years since new -but it never happened. I only met WZJ once, briefly, when I worked as a drop out in an audio store. (I was probably about 19 or 20 at the time). And i certainly remember the Servo-Statik but never heard one.
I was always pretty cautious about using any amp with the Quads, but once i get the Dual 75a retubed, I will probably run it through a set of dynamic speakers first and will try the phase thing. Best,
Bill Hart

Whart, Hope you don't mind another audio story. Since you mentioned Opus One, here is another.
My friend owned/co-owned the audio store "Opus Two" in Memphis, TN. When I visited him back in the early 70s, they had rack mounted Marantz Model Nines (two), 10B and 7C preamp all arranged in a very attractive wood paneled wall. It was stunning to see.
He also had the KLH Nines.
I was helping out one day in the store and in walked Isaac Hayes. He was very shy and was interested in the new "audio chair" that had just become available. It was the chair which had speakers enclosed within a “cocoon” type of arrangement. Isaac asked the price of the chair was and was told it sold for $700. He reached into his pocket, pulled out a wad of money, rolled off seven one hundred dollar bills, and then asked, "Does it come in red?"