Elpreq Tape Recorder

PORTABLE TAPE RECORDER FOR ONLY 27 GNS.

• Carriage and ins. 10/ -
• TAPE DESK Separately £16/10/ -
• CABINET Separately £4/17/6
• TAPE (not included) £1/15/- per reel.

Not a kit but assembled, tested, and ready for use, soon as the tape is fitted.

The new " Elpreq " Tape Recorder is a 4-stage unit of advanced design employing a 12AT7 valve for 1st and 2nd Amplifying stages followed by an ECL80, the triode section of which is used for further amplification and correction, the pentode section acting as R.F. Bias oscillator in the Erase and Record position and as output valve in the playback position.

In spite of the use of double valves and high gain circuitry, exceptional freedom hum and microphony have been achieved. The signal is fed into a double triode 1st section, RC coupled to 2nd section. Care has been taken with the dimensioning of the H.T. supply circuit in this stage to ensure absolute stability and minimum hum pick-up.
The 2nd stage which is gain controlled is fed R /C. coupled to the 3rd stage in the diode of which a variable tone control network accommodates various tape peculiarities. In the Record and Erase position, the pentode section of the ECL80 acts as an RF Bias Oscillator (Hartley). In the playback position, this section acts as an output pentode with a degree of bass boosting applied in the grid circuitry to ensure high-quality reproduction. A small degree of negative feedback is applied in this stage.

Wireless World April 1953, page 92

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