You are correct, Its a Realistic SA-10 Amp, The other is a GE S-990 head connected to nothing, I only wired up the display lights.The first on the bottom looks like a stereo audio amp, the second from the bottom looks like a GE-990 control head, maybe on a Delta?
I don't have an old scanner so I can't try the Converter.Say...nice stack!
I really like the way you have the two GRE units stacked apart like that with the Grove filter in between.
Those SA-10 amps are perfect for scanner use, I have two of them in use here with recording equipment.
Is the super converter still useful with the older scanner?