Matt -
On Standard Single Line Sets, when you went on-hook, you opened both Tip & Ring. All you really need to do is open one of them to break the circuit, so "A-Lead Control" requires first making one of those contacts spare and then using it to provide a closure for the A & A1 leads.
I can't speak to the Payphone (having no experience with them). The other two however...
On the Trimline:
Move the Brown Switch hook wire from C to G
Move the Yellow Switch hook wire from L2 to 3
Move one of the Black Ringer wires from 3 to C
Move the other Black Ringer wire from G to C
Move the Red Mounting cord wire from L2 to C
Move the Black Capacitor strap from L2 to L1 The other side goes to A)
Your A-A1 closure (the Black & Yellow of the Line cord) will be between G & 3
On the 554 Wall set:
Move the White switch hook lead from F to C
Move the Brown switch hook lead from C to G
Remove the Red Ringer lead from L2 & the Black ringer lead from G (they can be wired to the common bell from the ksu)
Tip goes to F
Ring goes to L1
A goes to L2
A1 goes to G
Double check these connections. It's probably been 25 or 30 years since I did one of these.
Sam
