No, they are making class-E amplifiers up in the microwave range now.
Naturally they don't have such high efficiencies as they have at HF
frequencies.
But broadcast triodes in class-C have been able to get 80 to 90 percent
plate efficiency.
73
Bill wa4lav
At 03:28 PM 2/29/2008 -0500, jeremy-ca wrote:
>Arent Class E monoband amps and pretty much with a 7 MHz upper limit?
>
>At least that was what I was told by an active E builder who had a 400W 75M
>AM amp inside about a 17 x 12 x 3 chassis minus the PS. I was impressed but
>I still like the glow of my 250TH's and 304TL's ! Even tho it takes up a lot
>of space and weighs a ton.
>
>Carl
>KM1H
>
>----- Original Message -----
>From: "Bill Fuqua" <wlfuqu00@uky.edu>
>To: "AMPS" <amps@contesting.com>
>Sent: Friday, February 29, 2008 10:12 AM
>Subject: [Amps] Class-E Amplifiers
>
>
> > Class E amplifiers have high efficiency but what about gain and drive
> > power. Some that I have see have about 10db gain but unlike tube type
> > Grounded Grid amplifiers
> > I don't think any of the input power goes to the output. If so this would
> > reduce the overall efficiency of a single stage amplifier and driver if
> > the driver is not Class-E.
> >
> > 73
> > Bill wa4lav
> >
> > _______________________________________________
> > Amps mailing list
> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
> >
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