This 100 MHz bridge circuit was found in an American 1970s documentation. The supply voltages are not indicated, nor are the tubes.
This old fashioned transistor amplifier was found in a publication of the year 1958. Transformer...
This circuit is used in VHF and UHF superheterodyne receivers. The circuit is from the 1964 RCA...
This circuit was found in ancient American documentation. It makes use of the operational...