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At least this is what CJ said.They added "Simple circuits tend to sound better than complex ones. And you can't get simpler than a triode. CJ's ART was an example of two-channel simplicity at its best. It used a single active-stage composite triode circuit, which we'll chat about with Lew in a moment. The key point is that the ART's entire amplification circuit all the gain was a single active stage with no buffers and no feedback."
Edits: 11/10/24Follow Ups:
A single triode which is 1/2 6922. Simple. Sounds nice and indeed sounds very nice. Transparent and a lot of low level details.
However the problem with a single triode is that the output impedance is too high (> 10K ohms).
So how about 10 triodes in parallel to lower the output impedance? Sounds nice!
at Sea Cliff twenty years ago on a phenomenal system driving VTL Wotans also running triode. The Burmester pair was pretty darn good digital in that day.
Note that the later ACT2 with 6H30s uses four triodes per channel vs ten for the 6922 based ART. My zero feedback ARC SP20 likewise uses 6H30s in the output stage for phono and line. The JFET gain stages work well for that job but have inherently high impedance. That's why inmate Victor called the 6H30 the "Super Tube" because of its superbly low output Z. It's the MOSFET of the tube world. :)
Also, I was made aware of the odd inverting phase nature of those C-J designs. You need to reverse absolute phase elsewhere.
Edits: 11/12/24
I have the little brother of ART - 17LS2. It uses 4 6922 per channel. Yes, phase inverted.
Is Conrad-Johnson ART Preamplifier the state of art?
The answer is NO.
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