Hello Keith
on your return question:
I don't understand this at all. The vertical amp plugins I have, 7A18 and 7A26, don't have any outputs. Do you mean somehow tap into the circuitry? Do you mean short the backplane pins?
This likely has little to do with the original topic (positioning the Readout), but it's a teaching/learning moment :-)
Thanks,
Keith Ostertag
Yes, this refers to the circuitry.
On the 7A26, you may want to check out the output stages which Q820/Q840 and Q860/Q880 form.
See page 3-3 in the 7A26 Rev C Manual from March 1975 for a description. And refer to schematics DISPLAY SWITCHING AND OUTPUT, number 4 on page number 63.
The contacts relevant for the vertical output signals on the rear connector are A11 (positive signal) and B11 (negative, as this is a differential signal).
Good Luck,
Magnus
