A Disc-Seal Triode as a UHF Amplifier

A disc-seal planar triode and its performance as a UHF amplifier are discussed. The description of mechanical features is followed by calculations of available power gain, and the measured gain is shown to be close to that computed by theory. The noise figure is calculated by conventional means, but the measured value is found to be higher. Reasons for the discrepancy are pointed out. The four pole admittances, y
ij
, and their influence on practical circuit design, are discussed.