Variable power supply (T463E)

This variable supply for tubes was found in a Popular Electronics from October 1968. The circuit uses a pentode power tube for regulation.

Twin-T Oscillator Using the 741 (CB249E)
An excellent low frequency sine signal is produced by this oscillator. The frequency is determined by the...
Control for Model Railroad (CB4350E)
This circuit was obtained from an English magazine from 1977. The magazine no longer exists, but...
12 W Amplifier (CB6303E)
This 12.5 W quasi-complementary amplifier was found in a 1969 General Electric publication. Note the high...