The grid driven circuit is pretty simple.
Matching the output at high voltages is another thing.
You will need to run your 4-1000A at around 6KV idle to get good drive out
of it. Mine runs at that. I get 1500 Watts out with less than 90 Watts in
on all bands. I drive it with an FT-1000D. This is great because then the
FT-1000D loafs.
The trick with the 4-1000A is with matching the output on bands like 10m.
The tank circuit with any reasonable Q is a bear there. STAY AWAY from the
B&W 801 switch assembly. Lots of guys and old assembly diagrams say it is
for the 4-1000. It is NOT. I use it and wish I didn't. Roll your own tank
coil.
I have a write-up somewhere on how I did my circuitry. I can post it again.
I also have some spreadsheets that I used for doing the matching circuitry
that I can send out.
In the mean time, you can check out my amplifier on my webpage:
www.qsl.net/ke9na
73,
Jon
NA9D
on 4/3/01 12:22 PM, gd0tep@qsl.net at gd0tep@qsl.net wrote:
>
>> My first question is for some advice on which secondary
>> voltage to build it around. I suppose it will be harder
>> to find parts to allow use at the 6/7kv level. Any advice
>> is appreciated. I'm also looking for parts for the project
>> as well. So fell free to send what you have for sale as
>> well as your suggestions.
>
>> Sam N3DFV
>
> Hi Sam.
>
> Is there any chance you could let me have a copy of the circuit diagram
> please?
> I've been searching for a grid driven circuit for ages, without luck.
>
> And, once complete, I'll also be up around 6kv mark.
-------------------------------------
Jon Ogden
NA9D (ex: KE9NA)
Member: ARRL, AMSAT, DXCC, NRA
http://www.qsl.net/ke9na
"A life lived in fear is a life half lived."
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