[TenTec] Hercules 444 amp

[Jim Brown]

On 8/9/2014 2:38 PM, Brian Carling wrote:
> So maybe the Hercules can be converted to use MOSFETs. Seems like it should be possible.

What causes you to say that? Have you designed and built solid state RF 
power amps? Have you studied the design of RF power amps? Theoretically, 
ANYTHING is POSSIBLE, but what is PRACTICAL? Do substitute devices fit 
mechanically? What about impedances and drive levels? What about bias 
and supply voltages? What about cost?

The 444 was designed around specific devices that Motorola decided 30+ 
years ago were not practical, and they felt strongly enough about it to 
leave mfrs like Ten Tec twisting in the wind. And Ten Tec chose to cut 
their losses and do something different (the Herc II).

73, Jim K9YC