Electrometer tube in UHF apllication

[Ravaner]

Hello. Has someone ever been heard about using (in the past) an electrometer tube, for instance CK5886 as UHF preamplifier ?

 

[tech99]

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]

Many thanks for reply