Oscillator unit 145

[ppppenguin]

i've just found one of these in the usual very dusty condition. Only found 1 reference onlien, to a a completed ebay sale for £49.99. Photo cached by google since they are deleted from the ebay listing.

Does anyone know anything about this unit?

It's likely to end up at the NVCF to help raise funds for the Vintage Wireless Museum.

PS: To moderator, could you please correct the typo in the thread title. Thanks.

[Andy M0FYA]

I believe it was used in the RCA ET4332 transmitter.
Andy

[ppppenguin]

I had a look inside and it's been badly got at. No valves, lots of snipped wires.

[Nowhere-Man]

Speaking of oscillators... I find a 2N107 transistor was used in the +1 amateur superhets. This was a 100 KC calibration oscillator, powered by an 8 volt drop across a cathode resistor. I was a bit baffled by the whole thing but a crystal is used. The voltage I figured was about 3 odd volts on the emitter, going on the resistor and emitter current (in the tables). I have looked at Hartley, Colpitts and Armstrong designs but thee transistorised oscillators are more unfamiliar. Why use this transistor oscillator and how does it all pan out?