[Amps] SELL: Ameritron AL1200 Contestor's Amplifier

[R L Measures]

On Jun 24, 2006, at 9:57 PM, Tom W8JI wrote:

> <<Tom -- So why do Eimac's published constant current curves
> on the
> tube begin to deviate from a straight line when the anode
> current
> exceeds  2.5a peak?>>
>
> Odd-order IM distortion is the result of a transfer function
> problem. We certainly can't tell what it is by looking at
> the curve at one plate current value. Especially if we
> consider how much negative feedback a GG amp has.  The best
> way to determine distortion is to actually measure
> distortion.
>
>> At 1700W and 200 mA Ig, grid dissipation is about 20
>> watts.
>
> <My guess is that it's close to 70v x 0.2a = 14w.>
>
> Eimac's tube calculator software disagrees with that guess
> and predicts 20 watts.

okay

>
> 73 Tom
>
>
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R L MEASURES, AG6K. 805-386-3734
r at somis.org