[Milsurplus] trany to tube transplant

[Bob Camp]

Hi

I took a look at the web site you mention. The radios he is working  
with are very simple designs.

Sensitivity is the easiest thing to get when doing a solid state  
"conversion". You have *way* more gain to work with using FET's than  
with tubes. The problems come with the more difficult to measure  
stuff like selectivity and overload immunity. Anybody who has bought  
a cheap SWL radio knows exactly what to expect .....

Bob

On Aug 31, 2007, at 10:57 AM, Ray Fantini wrote:

> Converting a LM to solid state is easy, it’s just an oscillator that
> basically works or it doesn’t. A transmitter or a high level audio
> stage is not brain surgery either, but the front end stages of a
> receiver or IF stages that have to deal with vast levels of signal and
> intermod products is entirely a different animal. Has anyone tried
> this?
> http://grc9.wildlandradios.com/
> He has solid state GRC, BC-611 and the BC-348. Don't get me wrong,  
> I am
> not saying it ant so but it all looks deceptively simple. I do not  
> know
> myself but have to wonder why if its that simple why manufactures  
> in the
> seventies like WJ had to use so many FET and transistors when this guy
> dose it all with a handful, maybe the most modern FET are way superior
> to the seventies and eighties designs and have great dynamic range?
> Ray Fantini KA3EKH
>
>
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