[Heath] Grid-block keying mod to MT-1 transmitter

[David Thorne]

I inherited a Cheyenne MT-1 transmitter from a friend, now deceased. We each
built our own MT-1/MR-1 combos in high school around 1960. A bit later my
friend added a modification on the 6146 final that looks like a change to
grid-block keying. It would be possible of course, but tedious, to figure
out visually what was changed/added. I know this is a longshot, but does
anyone have any information/schematics that might have been used to make
this modification?

Thanks,

Dave
K7KTB     
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