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Mechanical movement of the filament, grids or anode may induce artifacts in the anode current during conduction. Liquid cooled tetrodes, with specially designed, low-turbulence anode coolers that reduce mechanically induced noise, are available. FM broadcast transmitter amplifiers sometimes encounter a form of noise called synchronous noise (also called “Incidental AM”). Synchronous noise occurs when a FM signal is applied to a narrowband circuit, causing an AM component to be added to the signal.
A purple color indicates a VHF or UHF oscillation. With a little experience, it will become possible to guess the approximate frequency very closely. A wavemeter or an oscilloscope will then determine the exact frequency. (c) After the frequency of oscillation is measured, it remains to identify the circuit supporting the oscillation. The circuit must then be altered without disturbing the performance of the amplifier on the normal frequency of the amplifier. 2 Correction of Parasitic Oscillations The usual self-oscillations in RF power amplifiers have been found to fall in the following three classes: (a) Oscillation at VHF from about 40 MHz to 200 MHz, regardless of the normal frequency of the amplifier.
The degree of regulation and ripple depends upon the requirements of the system. In the case of a linear RF amplifier, it is important to have good anode power supply regulation. Without good regulation, the anode voltage will drop during the time the anode is conducting current heavily. This tendency for the voltage to drop will cause “flat topping” and will appear as distortion in the output. In a push-pull audio application where grid current flows, it is important to keep the grid circuit resistance to a minimum.