Philips 'superinductance' broadcast receiver type 634A

Made:
1933 in Surrey
maker:
Philips Electronics
Philips 'superinductance' broadcast receiver type 634A, 1933. Philips 'superinductance' broadcast receiver type 634A, 1933. Philips 'superinductance' broadcast receiver type 634A, 1933. Philips 'superinductance' broadcast receiver type 634A, 1933. Philips 'superinductance' broadcast receiver type 634A, 1933. Philips 'superinductance' broadcast receiver type 634A, 1933. Philips 'superinductance' broadcast receiver type 634A, 1933. Philips broadcast receiver , type 634A

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Philips 'superinductance' broadcast receiver type 634A, 1933.
Science Museum Group
© The Board of Trustees of the Science Museum

Philips 'superinductance' broadcast receiver type 634A, 1933.
Science Museum Group
© The Board of Trustees of the Science Museum

Philips 'superinductance' broadcast receiver type 634A, 1933.
Science Museum Group
© The Board of Trustees of the Science Museum

Philips 'superinductance' broadcast receiver type 634A, 1933.
Science Museum Group
© The Board of Trustees of the Science Museum

Philips 'superinductance' broadcast receiver type 634A, 1933.
Science Museum Group
© The Board of Trustees of the Science Museum

Philips 'superinductance' broadcast receiver type 634A, 1933.
Science Museum Group
© The Board of Trustees of the Science Museum

Philips 'superinductance' broadcast receiver type 634A, 1933.
Science Museum Group
© The Board of Trustees of the Science Museum

Philips broadcast receiver , type 634A
Science Museum Group
© The Board of Trustees of the Science Musuem

Philips 'superinductance' broadcast receiver type 634A, 1933.

This model is one of a series of receivers in which the Philips company achieved, with tuned radio-frequency circuits, a selectivity and range equal to that of contemporary superheterodyne receivers. The term ‘superinductance’ refers to the tuning coils, Litz-wound on glass formers whose efficiency was largely responsible for the success of the design.

The receiver employs two variable-mu high-frequency amplifiers, preceded by a band-pass input circuit, and followed by a diode-tetrode detector/amplifier and a pentode output valve. The tuning knob controls four carefully aligned capacitors, and also a potentiometer which varies the bias on the high-frequency valves, to maintain constant sensitivity over the waveband.

Details

Category:
Radio Communication
Object Number:
1968-665
Materials:
wood (unidentified), plastic (unidentified) and electronic components
type:
radio receiver
credit:
Combined Electronic Services Ltd.