Triodes work with lower signal voltages.
Triodes are more compact.
Triodes need higher power-supply voltages.
Triodes don’t need filaments.
Source of a MOSFET.
Collector of a bipolar transistor.
Anode of a diode.
Gate of an FET.
Free electrons, which pass among the electrodes.
Holes, which are conducted within the electrodes.
Holes or electrons, depending on whether the device is P type or N type.
Nuclei of whatever elemental gas happens to exist in the tube.
The power-supply voltage
The capacitance among the electrodes
The physical size of the tube
The current passing through the filament
The filament is separate from the cathode.
The grid is connected to the filament.
The filament serves as the cathode.
There is no filament.
The filament is separate from the cathode.
The grid is connected to the filament.
The filament serves as the cathode.
There is no filament.
Increasing the gain, helping the circuit to oscillate more easily.
Decreasing the plate voltage required to produce oscillation.
Minimizing the risk that a tube amplifier will break into oscillation.
Pulling excess electrons from the plate.
Triode.
Tetrode.
Pentode.
Hexode.
Triode.
Tetrode.
Pentode.
Hexode.
Has excellent sensitivity.
Exhibits high input impedance.
Produces little or no noise in the input.
Is more stable.
One plate.
Two plates.
Three plates.
Four plates.
Cathode.
Anode.
Control grid.
Screen grid.
Magnetic fields produced by current-carrying coils.
Electric fields produced by charged electrodes.
A variable voltage on the screen grid.
Visible light striking the electrodes.
Requires more driving power, for a given RF power output, than a grounded-cathode RF power amplifier.
Requires less driving power, for a given RF power output, than a grounded-cathode RF power amplifier.
Oscillates at a more stable frequency than a grounded-cathode RF power amplifier.
Oscillates at a less stable frequency than a grounded-cathode RF power amplifier.
Amplitude modulation.
Pulse modulation.
Velocity modulation.
Frequency modulation.
Poor signal-to-noise ratio.
Large size and heavy weight.
Slow response to image movement in dim light.
Excellent selectivity and electrical ruggedness.
A positive dc power-supply voltage.
A negative dc power-supply voltage.
Electrical ground.
RF ground.
A positive dc power-supply voltage.
A negative dc power-supply voltage.
Electrical ground.
RF ground.
A triode gas-filled tube
A photomultiplier tube
An electrostatic CRT
An electromagnetic CRT
Operating voltage.
Signal-to-noise ratio.
Response speed.
Image resolution.
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