[Amps] Question about SPE 1.3K-FA amplifier

[Kevin Stover]

W6PQL found when designing his HF SS amp that the LDMOS he was using 
would hit the 1dB compression point at about 11100W. If SPE is getting 
1300W from one dual core device they are over driving it or they aren't 
using enough negative feedback to stabilize and reduce total gain.

On 11/6/2015 9:25 PM, Bill Turner wrote:
> I notice the SPE 1.3K-FA amplifier is using a single LDMOS transistor
> to achieve a peak of about 1500 watts output. I am wondering how they
> do this and stay linear over the full 360 degree RF cycle. Normally
> with a single-ended amplifier you have to either use a resonant tank
> circuit to provide the "flywheel" effect, or run it class A. Solid
> state amps normally use two devices in push pull but this amp does it
> with only one.
>
> Since SPE apparently does not provide schematics or service manuals, I
> am left curious as to how they achieve linearity.
>
> Website:  http://www.spetlc.com/en/products/expert-13k-fa-uk.html
>
> Does anyone know?
>
> Educated guesses welcome.
>
> 73, Bill W6WRT
>
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-- 
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441