This 100 MHz bridge circuit was found in an American 1970s documentation. The supply voltages are not indicated, nor are the tubes.
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...
To small metal plates are used as sensor in this circuit. The skin resistance is enough to trigger the...
We found this circuit in documentation from the 1970s; The circuit uses Japanese transistors of...