This 1950s audio amplifier uses output tubes of type 1625 in its output stage. The Class B circuit provides a few watts of power and uses transformers that are not readily available today.
This circuit is from a 1968s Motorola documentation. The load can range from 10 to 100ohm and the...
This circuit was found in a 90s Popular Electronics. The frequency is determined by R3 and C1 that...
e find this circuit in documentation for radio amateurs of 1974. The unijunction transistor can be...