>What about AB2 cathode driven with both grids biased as grid driven.
** with cathode driven, both grids would normally be at RF-ground. If
the anode supply was c. 3500V, no DC grid V would be needed. With
3000VDC, c. 6V+ on the screen would be needed to get the correct ZSAC.
However, in AB2 cathode driven, a tuned input with a Q of c. 2 would be
needed for each band. About 130w is needed to drive a pair of 4-400s in
g-g, while under 80w is needed for AB1.
>Should
>be very linear since
>there would be little cathode current flowing thru the grids most to the
>anode.
>
>73
>Bill wa4lav
>
>
>At 11:09 AM 1/10/2003 -0800, you wrote:
>
>
>> >Bill (Wa4Lav) is looking to improving a T'bolt. I just went through
>> >ours (at work) and got it back on the air for some experimental work
>> >(as it can tune anywhere in the HF spectrum). Quickly I found how
>> >limited it is, and as someone stated, wasteful of a pair of 4-400As.
>> >
>> >With the low plate voltage (1950 under load) the thing naturally runs
>> >to AB2 class, as you kick up the drive.
>>
>>AB2 grid-driven makes rotten splatter with 4-400s.
>>
>>...
>>
>>- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
>>www.vcnet.com/measures.
>>end
>>
>>_______________________________________________
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>>Amps@contesting.com
>>http://lists.contesting.com/mailman/listinfo/amps
>
>_______________________________________________
>Amps mailing list
>Amps@contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
>
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
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