Audio research ref-610t mono power amplifier

The unit's voltage is 230V/50Hz.

On the front of the 610T is a vacuum-fluorescent, multifunction display screen which is addressable either via front-panel knobs, or by handheld remote. A variety of useful functions can be displayed on the screen: seven levels of illumination, including off; bias measurements for each output tube; A.C. line voltage level; logarithmic, scalable power output (0-10, 0-30, 0-100, 0-300, 0-600 watts); and total hours of tube life accumulated.

The REF 610T is a striking vertical design with tubes projecting above an anodized top plate. The advantages of this design allow easier, next-to-speaker installation, silent convection cooling and better weight distribution. 

Power-supply rectification is solid-state, while a total of six regulators are used: there is tube regulation of the input stage, with five additional solid-state regulators. The massive, custom output transformer is an ultra-wide-bandwidth design allowing a high damping factor and excellent current delivery. And, 50% coupling of the output-stage cathodes to the transformer yields both higher efficiency and better sound than conventional pentode or triode operation. Input is balanced only, with separate output taps for 4 - 8 -16 ohm speaker loads.

TUBE COMPLEMENT

(8 matched pairs) 6550C power output, (1) 6550C regulator, (1) 6H30 regulator amplifier, (2) 6L6GC driver, (2) 6NIP input, (1) 6H30 follower.