Philips Superinductance model 634A
Radio
1933-1934 (made)
1933-1934 (made)
| Artist/Maker | |
| Place of origin |
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. Source: Science Museum, London
This model was used in an advert for the Ovaltine milk drink and was sometimes referred to as the 'Ovaltiney set'.
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. Source: Science Museum, London
This model was used in an advert for the Ovaltine milk drink and was sometimes referred to as the 'Ovaltiney set'.
Object details
| Categories | |
| Object type | |
| Titles |
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| Materials and techniques | Veneered wooden case; Bakelite |
| Brief description | Radio, Philips 634A, 1933-34, veneered wood case |
| Physical description | A radio in a light oak case, with bakelite inset speaker fret and knobs. The Philips circular logo is embossed beneath the dial. |
| Dimensions |
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| Style | |
| Production type | Mass produced |
| Credit line | Given in memory of David Rush |
| Object history | Bequeathed by David Rush [81/695]. |
| Subject depicted | |
| Summary | 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. Source: Science Museum, London This model was used in an advert for the Ovaltine milk drink and was sometimes referred to as the 'Ovaltiney set'. |
| Collection | |
| Accession number | W.24-1981 |
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| Record created | June 24, 2009 |
| Record URL |
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