I'd post your question here:
https://antiqueradios.com/forums/viewforum.php?f=5
The reason is that you need to communicate with vintage radio people.
I've never owned a DX100 but my experience with classic transmitters
is that manufacturers made fairly significant changes over production
runs and the fellows referencing the DX-100 instead of the DX-100B may
be giving inaccurate information. For example, EFJ's Ranger began as
a cathode keyed rig, but the next major revision added a keying bias
circuit for grid keying. Next came a PTT modification. So, it's
possible the 100B is grid keyed. You need to use google to find the
differences between the 100, and 100B.
Happy New Year
Rob
K5UJ
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