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I heard these amps at the NYC Expona show in May 2011 driving enormous Wharefdale loudspeakers and they were glorious!
Audio Power Labs buys the 833 Richardson in Texas who imports them from China. Lots go through a matching process that yields 60 pairs, with the rest sold on eBay at cost.
The microprocessor-controlled amplifier has no capacitors in the signal path. It has less than 1% THD at rated output with a frequency response of 15Hz33kHz ±3dB. The company also sells the 50W 50TNT monoblock for $47,500/pair. It has a frequency response of 15Hz25Hz, ±3dB with less than 2% THD from its 8 ohm output tap. Unlike the 833TNT, its 572B output tubes are no longer manufactured, so Audio Power Labs has sourced over 700 tubes for their production and warranty work.
I heard these amps at the NYC Expona show in May 2011 driving enormous Wharefdale loudspeakers and they were glorious!