The AT-11MP is an L network tuner. The problem here is that it
will not cure the distortion due to the non-linear loading of the input to
the grounded grid amplifier. The Q of an L matching network is the square
root of the impedance ratio being matched. So if the Z ratio is near 1 then
the Q will be near 1 also. Another way to put it is that you will not have
enough fly-wheel action to reduced the cycle to cycle distortion on the
cathode ckt.
73
Bill wa4lav
At 09:29 PM 4/18/02 -0500, Gary Smith wrote:
>Hi,
>
>I've got 90% of what's needed to make a pretty decent amp. Still
>have the 3-1000Z & 4PR-1000A I'd mentioned some time ago as
>well as 4 4cx-1000A's. Got everything for the tank circuit & well...
>about everything except a tuned input & HV filter caps. I'll probably
>get the filter caps at Dayton. I would want this amp to cover all the
>ham bands.
>
>So about the tuned input. I used to have a nice toroidal tuned input
>with 8 sections but after the big D.. Well, I sold most of the small
>stuff & that went. I was thinking it might be nice to use one of the
>automatic tuners like the AT-11MP instead of making a fixed tuned
>input. Seems like the AT-11MP would find a nice match regardless
>of where I tuned.
>
>Is this a worthwhile approach?
>
>Thanks,
>
>Gary
>KA1J
>
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