[RTTY] st6k

[Jay WS7I <ws7ik7tj@gmail.com>]

Additional.

On Figure 5.12 Control Board.  No a1132B

There was also a change here on Pin 12.

Inserted between I6 A002 and a 4049 was a diode and then that extended 
in a new line with a diode down to the .01 and over to Pin 12.
A cut was made between the existing 10k and the old line.  Then a 10K 
added to gnd before Pin 12.
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