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The B&K 140 was a unauthorized and nearly part for part copy of our first Mos-Fet 150B amplifier sold to the "K" of B&K about a year earlier. The only difference was that they put the DC offset trim pot on the wrong side of the front end matched pair transistors so that improper adjustments could blow up the B&K amp. With our original, that could not happen.They jumped into the market with a big advertising splash that we could not hope to match. Of course they did not have to spend any money on engineering. We wrote to all the audio magazines about this at the time and were blown off by everyone.Anyway, they are long gone, and we are still doing just fine, so perhaps you should give the credit to our Mos-Fet 150B instead.Frank Van Alstine
Audio Research
I've found any amplification equipment that's dual mono (fully dual mono with matching transmission lines straight back to the dual trannies) has stood up rather well over time. Twin mono amps qualify of course, too There's simply no substitute for eliminating crosstalk between channels and the enhanced stereo imaging they offer. Dual mono was as or more prevalent in days gone by I think than today...too bad for us audiophiles.
The Dahlquist LP-1 crossover is another winner! Several have been for sale on 'bay lately.