I offer a circuit board for this. But includes a bias switching system as
well.
The sb 200 sb 220 and drake l4b will be ready shortly. See my
qrz.comcallsign for details.
73
Jim w7ry
On Aug 14, 2012 8:36 AM, "Jim Garland" <4cx250b@muohio.edu> wrote:
> A friend has a recently acquired lightly used TL-922A that is unmodified
> and
> works perfectly on all bands. He has asked me to replace the clunky T/R
> relay with a quieter & faster vacuum relay, and also to install a solid
> state relay to take the burden off the power switch. I'm not familiar with
> this amplifier, but from looking at on-line postings it appears to be an
> amplifier that owner's can't keep their hands out of! I've never seen such
> a
> hodge-podge of proposed modifications, some of which strike me as bizarre,
> others of which purport to improve on the original design, but which appear
> to be mostly preventative maintenance rather than solutions to actual
> problems. Still other mods probably work just fine, but are hard to install
> and require complicated circuitry. So, my question is whether anyone can
> recommend a simple way to swap out the noisy antenna relay and take the
> burden off the main power switch? I'm particularly interested in the
> mechanical layout, routing of wires, etc. I've not looked inside the
> amplifier yet, but from photos it appears to be rather difficult to work
> on.
>
>
> Thanks!
>
> Jim W8ZR
>
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>
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