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Ravaner
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Hello. Has someone ever been heard about using (in the past) an electrometer tube, for instance CK5886 as UHF preamplifier ?
The tube looks a if it is designed primarily to have very high grid resistance so it can be used for measuring voltages. The Gm is very low, and I think that, along with all the other 1.5V directly heated tubes, the performance at 100 MHz and above will be poor. I would be surprised if oscillation can be obtained at any frequency with this tube. There are much better ones available for UHF operation.Ravaner said:Hello. Has someone ever been heard about using (in the past) an electrometer tube, for instance CK5886 as UHF preamplifier ?
An electrometer tube is a type of vacuum tube used in electronic circuits to measure small electric currents or voltages. It consists of a cathode, an anode, and a control grid, and works by amplifying the current between the cathode and anode.
An electrometer tube is designed specifically for measuring small electric currents, while other vacuum tubes, such as diodes and triodes, are used for amplification or rectification of larger signals. Electrometer tubes have a higher input impedance and lower output impedance, making them suitable for measuring delicate electronic signals.
Electrometer tubes are commonly used in UHF (ultra-high frequency) circuits for measuring and amplifying small signals. They are often used in scientific research, such as in particle accelerators, as well as in medical equipment for measuring biological signals. They can also be found in communication systems, such as radio and television receivers.
Electrometer tubes have a high sensitivity and low noise level, making them ideal for precise measurements in UHF applications. They also have a wide frequency response, allowing them to accurately measure signals across a broad range of frequencies. However, the accuracy of the measurement also depends on the quality of the tube and the circuit it is used in.
While electrometer tubes have been largely replaced by solid-state devices in many applications, they are still used in some specialized fields where high sensitivity and accuracy are required. They are also used in some vintage electronic equipment and for educational purposes. However, the production of new electrometer tubes has significantly decreased due to the widespread use of solid-state alternatives.