Electrometer tube in UHF apllication

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SUMMARY

The CK5886 electrometer tube is not suitable for use as a UHF preamplifier due to its low transconductance (Gm) and high grid resistance, which are not conducive to effective performance at frequencies of 100 MHz and above. Users have noted that the CK5886 is primarily designed for voltage measurement rather than amplification. Alternative tubes specifically designed for UHF applications are recommended for better performance.

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  • Understanding of electrometer tube specifications
  • Knowledge of UHF frequency ranges and applications
  • Familiarity with transconductance (Gm) in vacuum tubes
  • Experience with tube amplifier design
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  • Research alternative UHF preamplifiers suitable for high-frequency applications
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Electronics engineers, audio engineers, and hobbyists interested in vacuum tube technology and UHF amplification techniques.

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 ?
 
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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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Many thanks for reply
 

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