Conrad Johnson MV60 monoblocks priced as pair

A set of MV60's converted to mono by Conrad Johnson factory service. This doubled the power to 110 watts and increased damping factor. Description and specs from CJ website.

Consistent with conrad-johnson's design philosophy that circuits should be kept as simple as possible, the MV60 works its magic with just eight vacuum tubes. A composite triode input stage is direct coupled to a cathode-coupled phase inverter. The two sections of the phase inverter drive the output stage, which is comprised of a pair of EL34s operated in an ultralinear configuration, producing 55 watts per channel. Limited negative feedback is applied to the circuit to reduce distortion and provide a sufficiently high damping factor to control most real-world speaker systems. Discrete dc power supply regulators are provided for the input and inverter stages, in order to isolate each stage from the output signal.
Variations on this simple circuit have provided the blueprint for many superb sounding CJ products in the past. This latest iteration benefits from recent advances achieved in our Premier range of products. Conrad-Johnson's continuing research into transformer design has uncovered an intricate variation on transformer construction that results in unusually wide bandwidth output transformers. These ultra wide-band Transpectral transformers are used in all of the current Premier power amplifiers. The MV60 is the first time these costly transformers have been used outside the Premier range. The MV60 also benefits from recent advances in power supply design developed for conrad-johnson's flagship products.
conrad-johnson products are internationally known for setting the standard of parts quality for the industry, and the MV60 proudly upholds that tradition. Premium-quality parts are used throughout. All circuit capacitors, including the main power supply filter and storage capacitors, are polypropylene - there are no electrolytic capacitors in the audio circuit or in the related power supplies. All audio circuit resistors are special high-precision, low-noise metal film types. The obsession for parts quality extends to the precision machined, gold plated input jacks and output connectors ‹ even the internal wiring was chosen on the basis of its sound quality in its specific application. The MV60 was subjected to exhaustive batteries of instrumental and listening tests before its design was finalized.

Specifications (in original stereo state)
MV60 Vacuum-Tube Power Amplifier
Power (ultralinear operation): 55 watts per channel from 30 Hz to 15 kHz at no more than 1% THD, both channels driven into 4, 8, or 16 Ohms. (when re-connected for the chosen load impedance)
Sensitivity: .8 volts rms to rated power (ultralinear)
Gain: 26 dB
Freq. Response: 20 Hz to 20 KHz +0/-.5 dB
Hum and Noise: 95 dB below 55 watts
Input Impedance: 100 Kohms
Phase: phase correct
Dimensions: 13.25D x 17.625W x 7H inches
Weight: 48 lbs.
Features: Built in led bias indicators, for easy, instrument-free biasing of the output stage.