>
>
>> 1) Is the AL-811H the same copy of AL-811, but
>> has an extra matched tube.??
>
>No. The AL811H is neutralized and has a few other changes. I'd go
>for the AL811H.
>
>> 2) Can i buy an AL-811 and then later, when i
>> retube it, drop in a matched quad of 572B's to
>> make it a AL-811H. I assume the 811 will have an
>> unused tube socket.
>
>You can drop in 572B's, but it would be a bear to add a fourth tube
>to the AL811. Three 811's are just on the edge of not needing
>neutralized, add a fourth tube and you would need to neutralize
// At what frequency is it neutralized on, Mr. Rauch?
>otherwise you'd have the Clipperton Syndrome.
>
// Clipperton syndrome appears to be partly the result of mounting the
input bandswitch wafer and the output bs wafer within 2cm of each other
with No shielding.
>Even the Collins 811 amps with four 811's are not totally stable
>because they lack neutralization.
>
// The Gonset and the Heath 4, 811A amplifiers were neutralized. Both
were squirrelly. Heath never built another "neutralized" g-g amplifier.
Gonset went belly up.
>572B's are a good mod to the 811 amp, they make it almost bullet
>proof. It is a cheap way to pick up the most power gain per buck. If
>your signal is marginal, the first few hundred watts more makes the
>biggest difference.
>
>> My setup has a TA-33 with the 2KW traps, a TS-440 exciter
>> and a MFJ-969( 300W tuner).
>
>The MFJ 3KW tuner is a good fit with the AL811, but the 969 is
>certainly not. I would NOT use the MFJ-969 with any amplifier.
// The MFJ 3kW tuner's Delrin roller coil reportedly caught fire at 900W
in the ARRL Laboratory.
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
end
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