This is a simple tubed mixer from the 50's. The circuit does not include the power supply and has 3 inputs with independent controls. The tubes are double and the inputs are high impedance.
This circuit was found in General Electric's 1965 documentation. It appears elsewhere on the site....
We found this circuit in a 1962 publication by General Electric. The circuit applies to common...
This multi-output oscillator uses CMOS integrated circuits that are uncommon today, but they can...