5Applying Vacuum Tube Devices
5.1 Introduction
Numerous circuits have been developed to meet the varied needs of high-power radio frequency (RF) amplification. Designers have adapted standard vacuum tube devices to specific applications that require unique performance criteria. Most of these circuits are built upon a few basic concepts.
5.2 AM Power Amplification Systems
Class C plate modulation is the classic method of producing an amplitude modulation (AM) waveform [1]. Figure 5.1 shows the basic circuit. Triodes and tetrodes may be used as the modulator or carrier tube. Triodes offer the simplest and most common configuration.
Numerous variations on the basic design exist, including a combination of plate and screen grid modulation. The ...
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