You don't indicate how much power you want. Monarchy Audio has 2 hybrid monoamps that are just below or in your range. Both use either* a 12AT7 or 6922** for Voltage gain, a bunch of MOSFETS for output devices, and NO negative feedback, global or local. The SE-160s sell (direct) for $2400/pr. and are rated at 160Watts into 8 or 320 into 4. The SE-250s are more expensive and more powerful.
Monarchyaudio.com. Owner's name is CC Poon.
After auditioning a pair of his smaller amps, I just ordered a pair of 160s for my 89dB-sensitive Audio Physic Avanti IIIs. The smaller amps sounded great; I wanted a warmer tonal balance and more power.
* apparently the owner is transitioning from the 6922 (et al) to the 12AT7, and since these amps are made to order, you get a choice.
** 6922, 6DJ8, 6CG7, 6FQ7, 6N1P, etc.
.
Monarchyaudio.com. Owner's name is CC Poon.
After auditioning a pair of his smaller amps, I just ordered a pair of 160s for my 89dB-sensitive Audio Physic Avanti IIIs. The smaller amps sounded great; I wanted a warmer tonal balance and more power.
* apparently the owner is transitioning from the 6922 (et al) to the 12AT7, and since these amps are made to order, you get a choice.
** 6922, 6DJ8, 6CG7, 6FQ7, 6N1P, etc.
.