Cadet III

When designing the successor for the popular Cadet Mk II, Rogers made a departure from their older styling for the Mk III and for the first time offered a rather 'modern' looking integrated amplifier, although the power amplifier and the control unit were still made as separate components. The example pictured at right was sold as an integrated unit with the control unit and power amplifier (lower two pictures) housed inside an Australian walnut case.

The front panel of the control unit featured a silver and black two-tone facia.The upper three knobs from left to right were balance, bass and treble (the tone controls were of the Baxandall type). Next to these were two low pass filter switches.

Beneath these controls was a row of push-button selector switches for stereo/mono, disc, radio and tape inputs. Next to these was a 5-pin DIN tape socket and to the right of this was the master volume - on/off control and power light.

The basic power amplifier circuit hadn't changed much from the Cadet Mk II, but more output was obtained by the use of a voltage-doubling silicon rectifier circuit in the power supply and improved output transformers.

The preamplifier was where most of the circuit innovations were to be found. By this time, the superior magnetic cartridges were gaining favour over the inferior ceramic ones. What had once been optional add-on' equalised magnetic cartridge preamps were now part of Roger's preamplifier. This was also one of the first preamplifiers to utilise the new ECC 807 low noise, double triode valves.

Manufactured by:

Rogers Developments Ltd., Rodevco Works, 4-14 Barmeston Road, Catford, London, S.E.6.

Price when new (in the UK):

£29 10s, (£32 10s in integrated free-standing case)

Description:

integrated amplifier

Mono/stereo:

stereo

Power output:

10 + 10 Watts (sine wave), 12.5 + 12.5 Watts IHFM.

Harmonic distortion:

0.25% at 5 Watts, 0.8% at 10 Watts

Frequency response:

±0.5dB 20-20,000 hZ

Loudspeaker matching:

3-5 and 12-16 ohms

Inputs:

magnetic and ceramic pickups (matching by plug-in adaptors) maximum sensitivity 2mV, radio and tape.

Filters:

high and low pass filters: 60 c/s and 6.5 Kc/s.

Tubes:

4 x ECL 86, 3 x ECC 807

Dimensions:

12 x 10¾ x 5½ ins (304.8 x 273.1 x 139.7 mm)

Power supply:

110-250 Volts AC 50-60 c/s