On Fri, 12 Mar 1999 11:24:20 +0008 "George T. Daughters"
<gdaught6@leland.Stanford.EDU> writes:
>
>
>Hi All,
>
>I've gotten several inquiries regarding building or converting HF
>amps using tetrodes such as Svetlana's 4cx400a, 4cx800a and 4cx1600b,
>
>as well as others.
>
>The optimum way to handle such a project is, in my opinion, to use
>the G3SEK "tetrode boards." They include protective circuitry, bias
>and control power supplies, and just about all you need except a
>plate voltage supply and RF deck. They have an optional transformer
>which will provide the necessary screen grid, control grid, relay,
>etc. voltages.
I agree George.
Did a conversion to my own 6M NCL-2000 last year and IMD improved by 6dB.
Just finishing up a conversion for MR 6M, WA1OUB's, old Johnson 6N2
T-Bolt. A big improvement with Ians boards, xfmr and a HV PS upgrade.
Next step is Svetlana 4CX400A's and a clean 1200W with the help of the
long prior installed Dahl HV xfmr.
I would be interested in hearing from others that have toiled under the
6N2 !
Taking it slow, photographing everything and hope to publish the results.
I wish I had those boards and/or info when I built a few 4CX1600B's for
6M a few years ago. On VHF and above every dB in IMD improvement is a
help.
73 Carl KM1H
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