sdecker - thanks for the input. My 220-230 estimate was from Rob’s memory. I’ll replace that estimate with your 611-12 old-style 2.4s.
Now, a thought about Lexington vs FST coils. It seems that one of the extenuating circumstances around taking XO production to FST was that our original coil wire became unavailable. As a reminder: we had "found" an aerospace communication wire in 1978 while developing the 03. It was 6-9s oxygen free, long crystal, slow drawn, polished wire. Its use in our coils was transformative. (Longer story embedded in this forum’s prior history.) Over the years, that wire was "degraded" to CDA101 (5-9s) with less stringent production values. Then CDA102 (4-9s), still a league above "normal" CDA110 electrolytic tough pitch magnet wire used in most applications and by most hi-fi manufacturers. ERSE tells me that in the mid-2000s those high conductivity, high purity wires became "unavailable" and were replaced by CDA110-special, which meets only the 99.9% / 3-9s spec, with special attention paid to extrusion, surface quality, etc.
Bottom line is that Lexington boards have at least CDA102, and older boards have CDA101 coils and they are wound to optimum aspect ratio, tensile pull and bonding formulation. These Lexington coils are world class. Coils on ’glass’ boards from FST are best presently available, CDA110 special, but certainly lesser than the Lex / Masonite board coils.
