you guys seen this?
Lee, w0vt
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On 1/8/2025 3:50 PM, Gary WB6OGD via
groups.io wrote:
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It is pretty easy to make a solid state mixer. Unlike
amplifiers, that need just a certain amount of amplification,
extra AVC inputs, etc., mixers are
basically non-linear choppers.? They just need enough gain to
chop and enough voltage tolerance for the circuit they are in.
?
My very first experiment was a J-310 FET(the only FET I had)
plugged into the R-4A Pre-mixer socket.? I only had to
disconnect the +150V plate supply resistor and hook it to about
18VDC(?).? Worked fine though hooking it to the T-4X and
selecting XMTR control might have blown it.
?
I researched more (stole designs and modded) and now have a
plug in tube replacement.? Works great.
Attached is what I think I am running now.? I also attached a
6AU6 replacement from the Collins site.
?
Beats trying to buy expensive, possibly bad old tubes.? YMMV.
My 6HS6 is now safe and part of my 401K IRA.. hi hi...
73,
Gary
WB6OGD
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