Does not look to me, that the above mentioned article answers Sean's very well founded question. I sincerely hope RM will come back to this thread. He, by the way, was the designer of a wonderful preamp marketed by Beveridge, which a hatchet job review of HP in favour of the SP6 unjustifyably drove off the market and Beveridge into ruin. Cannot remember when that was, must have been in the seventies, It was then, I think, that RM started RAM tubes and his RAM Labs enterprise.
