R.S.V.P. Radio Gramophone

R.S.V.P Radio Gramophone

An exhibit of greatest interest on this stand is a combined radio & gramophone receiver built into a suitcase of surprisingly small dimensions considering the nature of the apparatus.

 Actually, it is no larger than the average portable gramophone, but of course has a vastly wider field of utility than a gramophone could possibly achieve. For wireless reproduction a five-valve receiver is used, the circuit follows the generally adopted practice in this respect, namely 2 HF stages, a detector, and two LF amplifiers. The lid accommodates a cone loudspeaker and two separate frame aerials, one for normal broadcast wavelengths and the other for the Daventry band.

A 100-volt HT battery and a 2-volt LT accumulator are ingeniously accommodated in the same compartment as the gramophone motor.
For gramophone reproduction the low-frequency side of the receiver only is used, an Igranic pickup being the link between the receiver and the amplifier. Records up to 12” diameter can be played.

See also the R.S.V.P., Portable.

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