I measured 2nd harmonics at 5 watts that were 52 dB down and 3rd at 72 dB down. My distortion THD at 1 watt was 0.65% and at 5% it was 8.4 watts, peak power over 12 watts. The one nasty photo on the spectrum analyzer was the “Little Monster” growling back at me when I pushed it to a sustained 14 watts. (I’m a big meanie) .. The output transformer was really (literally) screaming at me. I just placed it in my big listening room and paralleled the two Quintet 15 speakers to the one channel I had working. That’s 8 15 inch woofers folks and it rocked the house and into a 4 ohm load no less
More to come as I get the chassis modified for the (4) 2A3 output tubes. I will be working toward that end next week and also adding some “dual” regulators to the DC filament supply’s” I’m thinking at this point pricing for the new offering will be $ 10,500 a bargain for the pure class A and best 2A3 amp on the planet. That includes the Ultra special wide band remote mounted transformers!.
Dr. Evil Head Whammer
“Somebody Help Me”