I made several mods on my 100. don't remember them all but one was a
spotting button to get on the qrg. another was having the V F O tube run
all the time while transmitting for more stability and keying the next tube
with grid block type keying maybe the 12 B Y 7. another was neutralizing the
finals with a wire bent in one direction or another to avoid self
oscillation. boy these thoughts bring back a lot of memories from the 60s.
73
Ed K7UC