Wattmeter (T1351E)

This circuit is from a February 1949 Radio Electronics magazine. The circuit uses 3 tubes and includes the power supply.

Mini portable amplifier (CB21741E)
This amplifier is from a May/April 1969 Popular Electronics. The components are from the period and...
Double conversion receivers oscillator (CB4047E)
This circuit may be used in IF steps of dual-conversion receivers, i.e., a type of receiver that uses...
5 to 60 kHz FM Demodulator (CB25782E)
This 555 IC circuit was found in the November 1994 issue of Radio Electronics magazine. The...