Included were a couple of old Marconi signal generators -
- one a BFO audio generator - a pair of RF oscillators on slighlty different frequencies mixed to give an audio signal,
- the other an "ultra short wave" signal generator - 10Mc/s to 150Mc/s.
The Ultra Short Wave Signal Generator had a small wooden storage unit fitted to the back of the case. Originally it had a spare lamp, fuses and set of valves. Though some were missing - pressumably used during its working life a couple of valves and fuses remained.