High Definition Stereo Control Amplifier (1974)
The Radford HD250 is in practice a ZD22 preamplifier plus a dual channel power amplifier and large power supply.
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
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