I would figure AB2 instead. I´ve yet have to see a ham stay
within AB1 with his amplifier.
Also, this guy had the ARRL handbook, you can find all of this
in that 1982 ARRL handbook.
73 Jim SM2EKM
----------------
Joe Subich, W4TV wrote:
> Phil,
>
> What class of operation, A, AB1, AB2, B or C and what conduction
> angle if class C? The 1.8 factor is an averaging factor based
> on conduction angle. For example, class A will be Ep/Ip while a
> single tube in class B will be Ep/(2*Ip) because the peak currents
> are twice the DC average due to the 180 degree conduction angle.
>
> A typical tetrode amplifier will have a lower multiplication
> factor since it will generally be operated in class AB1 (no
> grid current, longer conduction angle), while most triodes in
> grounded grid will have a higher multiplication factor due to
> the lower conduction angle (closer to class B).
>
> To simply use 1.8 is close but if the 4-400A is being used as
> a tetrode and grid driven, 1.8 will probably give too low a
> plate impedance ... the multiplier for AB1 is closer to 1.55
> or 1.6.
>
> 73,
>
> ... Joe, W4TV
>
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