Jfet bipolar cascode video amplifier

  
The JFET-bipolar cascode circuit will provide full video output for the CRT cathode drive. Gain is about 90. The cascode configura-tioneliminates Miller capacitance problems with the 2N4091 JFET, thus allowing direct drive from the video detector
Jfet bipolar cascode video amplifier - schematic

An m-derived filter using stray capacitance and a variable inductor prevents 4 MHz sound frequency from being amplified by the video amplifier.




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