[Elecraft] 100 Watts or 500 Watts

[Tony Estep]

On Wed, Dec 22, 2010 at 10:45 AM, John Ragle <tpcj1r03 at crocker.com> wrote:

> On 12/22/2010 11:30 AM, a lister wrote:
>
> ...When I was little, "grounded grid" was vaunted as the way to use triodes
> without needing neutralization...


Yep. Remember the bifilar filament chokes? You could go to the ham store,
get one of those, a cool litz-wound plate choke, and a bandswitching tank
coil, and the variables you needed for a pi-network output, and build a heck
of an amp.

Another way was the NCL-2000 way, wherein the input circuit was just a 50
ohm resistor and the amp ran in class AB1, using 8122 ceramic tubes.  IIRC,
about 50 watts of drive was enough. An amp designed that way could use a
higher value resistor, show the transceiver a mismatch, and get by with less
drive. If you used a 200 ohm resistor and a 4:1 balun, you could probably
drive such an amp to the max with 10-15 watts, no step-up stage required.

Tony KT0NY