6SN7 Preamplifier (T1105E)

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

100 mA Piezoelectric Generator (CB25413E)
The circuit in the figure is suggested by Linear Technologies (www.linear.com) and consists of a...
Differential Amplifier (CB6546E)
This circuit was found in an American publication from 1968. The transistors are from the time,...
Car audio booster (CB7253E)
Found in a 1990 Hobbyst Handbook this circuit has an output power of a few tens of watts and...