This circuit is from an old Japanese publication of 1962. The circuit uses two batteries, one for the filaments of the tubes and the other one of high voltage for the plate circuits.
September 2016 - Mouser Electronics already has in stock the new IC TPS92515 LED driver from Texas...
This crystal-controlled oscillator can generate signals as high as 200 MHz. The L1 coil is made up...
This MOSFET amplifier operating in the VHF range was found in an old American telecommunications...