Electrometer tube in UHF apllication

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The CK5886 electrometer tube has been discussed as a potential UHF preamplifier, but its suitability is questioned due to its design for high grid resistance primarily for voltage measurement. Concerns include its low transconductance (Gm) and poor performance at frequencies of 100 MHz and above. Users express skepticism about achieving oscillation with this tube at any frequency. Alternatives are suggested as being more effective for UHF applications. Overall, the CK5886 is not recommended for UHF use.
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Hello. Has someone ever been heard about using (in the past) an electrometer tube, for instance CK5886 as UHF preamplifier ?
 
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Ravaner said:
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.
 
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