Description
The Radford HD250 is in practice a ZD22 preamplifier plus a dual channel power amplifier and large power supply.

Specifications
Power output: 50 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 32kHz

Total harmonic distortion: 0.02%

Input sensitivity: 2mV (MM), 100mV (line)

Signal to noise ratio: 80dB (MM), 88dB (line)

Dimensions: 430 x 115 x 280mm

Weight: 9kg

Year: 1975