[Amps] MRF151G Vs VRF2933

[Roger (K8RI)]

Thanks John,
"I think" I can "almost duplicate the Quadra RF deck.  I'd use a 
different power supply.  Maybe a couple of those from the telcos. The 
gates would likely require 1 ohm resistors. 8 of those will put out 2400 
Watts, so a little NFB to let them run 1500 to 2 KW should make for a 
rugged and linear, no tune amp. I think I could get a LPF kit off E-bay 
although I didn't find any anp parts from the ham in Israel.

73, Roger (K8RI)

On 5/3/2017 3:34 AM, John Lyles wrote:
> The MRF151G is a push pull 'gemini' packaged part. MACOM sells their 
> equivalent on Mouser's website for about $105 in 10 piece qty. This 
> part has been around for decades and is very well known and used in 
> thousands of places. It is one example of a power RF semiconductor 
> that has market longevity like a tube. Recently at CERN, the 
> Swiss/French particle accelerator site, a new design of RF drivers was 
> developed around this part. They are modulator units that provide 
> about 1 kV of kick to the protons, and are driven by a cluster of 
> MRF151G's running in HF range. Radiation can kill semis, but the 
> MRF151G has pretty good lifetime and they have figured out a special 
> way to compensate for the bias shift in the parts. Plus, its cheap 
> enough just to throw the transistors away every year or so and replace 
> with new, in the big scheme of things.
>
> I recommend designing around the 151G if you want a long time source 
> for parts. We use them in a number of solid state amplifiers where I 
> work too.
>
> 73
> John
> K5PRO
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