Actually a class C amplifier can be made to perform as a linear. The technology 
is over 60 years old but I don’t think it has ever been tried in amateur 
service. 

Sent from my iPad

> On Aug 17, 2018, at 3:06 PM, Bill Frantz <[email protected]> wrote:
> 
> And I would guess it was running in class C, which is not linear, so only 
> useful for certain modes (including FM). Class C can convert most of the 
> input power to RF power.
> 
> 73 Bill AE6JV
> 
>> On 8/17/18 at 11:48 AM, [email protected] (Fred Jensen) wrote:
>> 
>> One 10 KW FM transmitter I helped build used four 4-1000A's in parallel and 
>> the filament power was 600 watts. Efficiency, including filament power was 
>> just over 70%.
> -----------------------------------------------------------------------
> Bill Frantz        | Ham radio contesting is a    | Periwinkle
> (408)356-8506      | contact sport.               | 16345 Englewood Ave
> www.pwpconsult.com |  - Ken Widelitz K6LA / VY2TT | Los Gatos, CA 95032
> 
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