[sdiy] oscillator transistors, on Vox , was: RE: Oscillator caps - please help!

Peter Blackett dragon.servicing at virgin.net
Fri Aug 17 17:53:05 CEST 2007


Hi,
I've changed some transistors on a Farfisa Console Organ and I found 
that  using  different types of transistor doesn't affect the  stability 
very much, as long as they are Silicon transistors.
if the original uses germanium transistors then the stability won't be 
as good.......
but if you replace them with Silicxon ones you may have to change the 
bias components.
( was it the early Vox's that used Germanium transistors ? )
regards Peter

Antti Pitki wrote:

> Oh, I forgot. I assume it's OK (by OK I mean that the oscillator is 
> stable) to use any basic general purpose transistors for the main 
> oscillators of my Vox Continental 2 (as long as the polarity is 
> correct)? These don't need to be special temperature stable 
> transistors (if there are such transistors, as I said, I'm a beginner 
> in this stuff)? The oscillator is a typical "organ oscillator" (a 
> Hartley oscillator?) with a adjustable coil, two caps and a transistor.
>
> Antti P.

 



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