>
>At 8:17 PM -0500 2001/1/28, measures wrote:
>>... not with the Class AB1 amplifiers I constructed. In Class A,
>>anode-I never cuts off during during transmit. In AB1, anode-I cuts off
>>on each cycle as the grid is driven negative.
>
>
>We agree that in Class A, plate current never cuts off; and that in Class
>AB, plate current cuts off on the decreasing plate-current peaks (which
>correspond to the decreasing grid-voltage peaks). AB or AB1 or AB2, this
>is true.
>
>All I'm saying is that if your amplifier has been biased for AB operation
>and you want to change its operation to Class A and get the maximum
>possible power out, you need to change the bias to increase the quiescent
>current.
>
>Yes? -Chuck W1HIS
>
An 8171 will easily do more than 1500 out in Class A. The goal here is
to not exceed 1500w. To accomplish this, turn down the mic. gain and
do not mess with the ZSAC/Grid Bias adj..
cheers, Chuck.
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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