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Manufactured by: Rogers Developments Ltd., Rodevco Works, 4-14 Barmeston Road, Catford, London, S.E.6.
PREAMPLIFIER Mk. I Mk. II Mk. III
Year of manufacture: 1952- 1954 1953 - 1954 1957 - 1961
Price when new (in the UK): £8. 10s £9 £11
Inputs: radio, mic (8mV); pickup (40 - 60mV) radio, mic (8mV); pickup (40 - 60mV) radio, mic (10mV); pickup (30 - 50mV); radio (150mV); tape (200mV)
Filters: fixed low-pass variable low-pass variable low & high pass
Tubes: single ECC83 single ECC83 single ECC83
Size: 5 x 8½ x 5½ inches (127 x 216 x 140mm) 5 x 8½ x 5½ inches (127 x 216 x 140mm) 5 x 8½ x 4½ inches (127 x 216 x 114mm)
       
POWER AMPLIFIER      
Year of manufacture: 1953 - 1961    
Price when new: £17    
Mono/stereo: mono    
Power output: 10 watts RMS, 14 watts peak    
Distortion: 0.12% at 8 watts    
Frequency response: 20 - 30,000 cps ±0.25dB    
Hum & noise: -85dB    
Feedback: 20dB    
Output impedance: 2-3, 6-8 and 12-16    
Tubes: 2 x EL84 output valves    
Dimensions: 6 x 11 x 5 inches (152 x 279 x 127mm)