15W Amplifier (T1543E)

Found in the 1975 RCA tube manual, this high-fidelity amplifier has 3 tubes on the active part plus a rectifier for the source.

12-V Battery Charger (CB1579E )
The battery charger suggested in the figure has its current limited by resistor R1. This component may...
8 Channel Encoder with 4017 (CB4530E)
This circuit was obtained from an English magazine from 1979, but can be easily assembled today...
SCR Test Circuit (NI007E)
This circuit is used to test SCRs like the ones of TIC series. The simulation shows the power line...