This amplifier was found in a tube equipment manual from 1947. The high-fidelity circuit has pentode tubes at the output and a source with transformer.
This amplifier is from a May/April 1969 Popular Electronics. The components are from the period and...
This circuit may be used in IF steps of dual-conversion receivers, i.e., a type of receiver that uses...
This 555 IC circuit was found in the November 1994 issue of Radio Electronics magazine. The...