Germanium power transistor 2n1522

[VMUNIX]

My curiosity got the best of me so I did some digging. The 2N1522 was used in military two way radio systems as a step up switching transistor. This replaced the mechanical vibrator or dynamotor type supply used before transistors this big were available.

A pair of these were used in a cross coupled multivibrator switching arrangement driving a transformer to step up 12 or 28 volts to several hundred volts to operate tube radio equipment. Their low VCEsat is why germanium was preferred over silicon for this application. Typical operation is a saturated or cutoff type switch in the 1 to 2 KHz region.

The 2N1522 has both a NSN (Navy) and an FSN (all military).

wow, good stuff, I definitely saw a circuit application of this 2n1522 in a sort of 12v to high votage converter most likely for mobile transmitting equipment.
I have a few schematics of delco and phillips hybrid car-radios, I will take a look at them. For now thank you very much for the guidance.

 

[nikosdoykas]

Here are some examples, ranging from 10W to 45W.

Your transistors would have no difficulty coping with this kind of power.

the schematics iw from book?

 

[Elvee]

A member asked me for the source of some of the schematics:
It is indeed "Appareils électroniques à transistors" by Hermann Schreiber:

 

[Ripcord]

all of my teenage years in six screenshots!

Great!