Here are the specs on the Envoy amplifiers.
Here is a pic to get the general idea of what these amplifiers look like.

3000A 200 Watt Vacuum Tube Monobock Power Amplifier
Rated Output Power: 200 W per channel at 8 ohms, 25Hz to 40KHz
Frequency Response: (at 1 watt into 8 ohms) 14Hz to 50KHz + 1dB
Distortion THD: Less than 1% at 150 W output, 21Hz to 28KHz
Circuit Type: Ultra Linear, Class AB
Input Impedance: 100Kohms
Input Sensitivity: 2.35mV at 1KHz and 8 ohms for 200 watt output
Output Impedance: 4 and 8 ohms
Tube Complement: 2 pcs. 211 power output; 2 pcs. El34 power drivers, 2 pcs. 12AT7 power drivers
Dimensions: 11 in. W X 19 in. D X 9 3/4 in. H
Power Requirements: 110V-120 VAC 60Hz 180 watts-standby, 850 watts maximum (220 VAC 50Hz option)
Weight: 60 pounds net each, approximately 65 pounds packaged each