This receiver consists or a single circuit with the note amplifier
mounted in the same case. It is intended for use in lifeboats
when the directional receiver is not fitted. The receiver employs a .detector
valve, and note magnifier valve with variometer tuning and reaction.
The two valve filaments are connected in series and a crystal is provided
for emergency use. A changeover switch is provided to bring either
the crystal or valves into operation.
The receiver is of such a simple design that no further description
is necessary. Simplified diagrams of connections for valve and crystal
reception are given in fig. 366.
