SB-220

[Mark Graalman WB8JKR]

  If you tack about 50-60 ohms from the cathode terminal to
ground at the tube sockets, ty-wrap the T/R relay into the
transmit position and leave the tube in the sockets, with the
power OFF take a SWR analyzer like a MFJ 259 or
low power transmitter that won't over heat the cathode to
ground dummyload and a SWR bridge and you should be able
to get them in the ball park, figure a cathode Z of about 55 ohms
for a SB-220/221 and about 200 ohms for a SB-200/201

Mark  WB8JKR


On Sun, 22 Sep 2002 11:31:32 -0500 Martin Tippin <w0akg at AEROSURF.NET>
writes:
> Anybody know of a simple way to tune the input slugs,  Previous owner
> liked to tinker, thanks
> Martin L Tippin WØAKG
> 140 Monarch Lane
> Branson, Mo 65616
>
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