[Milsurplus] Germanium to silicon

[Bob Camp]

Hi

In order to "convert" to silicon you are going to need to rebias the  
circuits. Both the gain and the Vbe of the "new" transistors will be  
different. In addition the Ft of most silicon transistors will be  
higher than the germanium parts you are replacing. That will get you  
into changing capacitor values. Once you do than you change  
impedances so the coil values change .....

It's a long slippery slope.

Bob

On Aug 30, 2007, at 4:12 PM, Brad Latta wrote:

> Good day all,
>               I have one of the R-1051 navy receivers
> & I am wondering about replacing a lot of the
> germanium transistors in the modules with silicon
> ones, as the germanium transistors are impossible to
> get, especially in the RF amplification stages.
> Several of these are leaky. The germanium ones seem to
> have lower voltage & current operation than modern
> silicon types, 2N700, 2N1224, 2N1225, 2N3127 etc
>                 Brad
>
>
>        
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