Touch controlled voltage source (CB22141E)

We found this circuit in an old English documentation. Transistors support modern equivalents.

Power supply for the 60 W amplifier (CB24249E)
This is the power supply for the amplifier in the previous circuit. We found it in the same Radio...
10-Channel Up Down Sequential (CB16982E)
We found this circuit in a 1990 documentation. It is totally up to date by the components it uses...
Broadband voltage follower (CB9344E)
This circuit was found in a 1970s General Electric documentation. Transistors are uncommon today....