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The First Watt M2 is a two channel audio power amplifier delivering 25 watts per channel. It uses JFET and MOSFET transistors operating in Class A mode without negative feedback. It uses a passive voltage gain device, an auto-former preceding the output stage.
Original Nelson Pass product, small series, now discontinued.
It offers a lot of the performance of the best SET amps, while keeping a good solid state bottom end control. 25W into 8ohm, 40W into 4ohm. Multiple reviews online.
From the manual:
Summary of the nominal specifications: Measured at 120 V AC and an 8 ohm load: Distortion @ 1 watt.025% @ 1 KHz, Input Impedance100 Kohm Gain14 dB Input Sensitivity500 mV = 1 watt, 3 V = rated power Damping Factor20 Output power 8 ohms25 watts @ 1% THD, 1KHz Output Power 4 ohms40 watts @ 1% THD, 1 KHz Frequency response+0, - .5 dB @ 20 Hz, 25 KHz Noise500 uV unweighted, 20-20 KHz Power consumption160 watts Fuse3AG slow blow type, 2.5 Amp for 100-120V
It does have some of the qualities that SET aficionados look for. The auto-former does bring its own signature to the sound, although in smaller doses than we usually experience. The midrange has a lush, warm character that I associate with tubes and transformers, but subtly so. Part of this is due to the limited bandwidth of transformers, and part of it is the lack of feedback artifacts.
On the other hand, there is considerably less harmonic distortion than with no-feedback SETs, and if you really do like that distortion then the M2 might not be what you want. Also, there is more power than usual and a relatively high damping factor, so the M2 is different in that regard.
The M2 strikes a balance in the performance space between the extremes of big behemoth solid state power amplifiers and little tiny single-ended triodes.
Buyer to cover shipping - I estimate about 35lb from 83712.