6SN7 Preamplifier (T1105E)

This preamp circuit has a typical configuration as found in a 1946 publication. Supply voltages are indicated.

Field strength meter (CB9740E)
This circuit, with adjusted sensitivity, can use common general-purpose transistors. The circuit is...
5 to 200 seconds timer (CB21401E)
This circuit was found in a 1967 RCA documentation. The semiconductor components are from the...
Astable Multivibrator (MSB016E)
This is the traditional configuration of na Astable Multivibrator using two NPN ttransistor....