The EV1 was a separate phono equalization preamplifier designed to provide the additional gain and RIAA equalization that modern phono cartridges require. Based on the circuit used in conrad-johnson’s acclaimed Premier Fifteen, the EV1 used a single-ended triode input amplifier comprised of both sections of a miniature twin–triode tube connected in parallel for reduced noise. A second single-ended triode amplifier provided added gain. A passive network of precision components between these two stages set the required frequency equalization. A direct coupled cathode follower output stage yielded a low output impedance. The EV1’s circuit employs no negative feedback loop. The EV1 was a simple, low-noise, high-gain device well suited for use with a wide range of phono cartridges of both moving magnet and moving coil types.

Specifications

Gain: 49 dB
Phono Overload: 200 mV
Phono Equalization: within +/- .25 dB of RIAA
Hum and Noise: 78 dB below 10mV input
Phase: phase correct
Mechanical: 14.375D x 19W x 3.315H inches
Weight: 14.5 lbs.