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Hartley118 · 13th May 2022, 10:33 am

As an example, a couple of weeks ago I had to replace a dead AF117 frequency changer in my Bush TR130 transistor portable. The only PNP transistor I had to hand was a common-or-garden silicon BC214. It works fine. It of course ran at a lower collector current because of the higher Vbe of the silicon device, so I increased it by lowering the emitter resistor value. But that made no apparent difference to its performance.

Martin

13th May 2022, 10:33 am	#4
Hartley118 Octode Join Date: Aug 2015 Location: Cambridge, Cambs. UK. Posts: 1,996	Re: Germanium transistor replacement As an example, a couple of weeks ago I had to replace a dead AF117 frequency changer in my Bush TR130 transistor portable. The only PNP transistor I had to hand was a common-or-garden silicon BC214. It works fine. It of course ran at a lower collector current because of the higher Vbe of the silicon device, so I increased it by lowering the emitter resistor value. But that made no apparent difference to its performance. Martin __________________ BVWS Member