Electrometer tube in UHF apllication

  • Thread starter Thread starter Ravaner
  • Start date Start date
  • Tags Tags
    Tube
AI Thread Summary
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.
Ravaner
Messages
134
Reaction score
3
Hello. Has someone ever been heard about using (in the past) an electrometer tube, for instance CK5886 as UHF preamplifier ?
 
Engineering news on Phys.org
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.
 
  • Like
Likes davenn
Many thanks for reply
 
Thread 'Weird near-field phenomenon I get in my EM simulation'

Thread 'Weird near-field phenomenon I get in my EM simulation'

I recently made a basic simulation of wire antennas and I am not sure if the near field in my simulation is modeled correctly. One of the things that worry me is the fact that sometimes I see in my simulation "movements" in the near field that seems to be faster than the speed of wave propagation I defined (the speed of light in the simulation). Specifically I see "nodes" of low amplitude in the E field that are quickly "emitted" from the antenna and then slow down as they approach the far...
View full post »

Thread 'EMF (Electromagnetic Field) & EHS (Electromagnetic Hyper Sensitivity)'

Hello dear reader, a brief introduction: Some 4 years ago someone started developing health related issues, apparently due to exposure to RF & ELF related frequencies and/or fields (Magnetic). This is currently becoming known as EHS. (Electromagnetic hypersensitivity is a claimed sensitivity to electromagnetic fields, to which adverse symptoms are attributed.) She experiences a deep burning sensation throughout her entire body, leaving her in pain and exhausted after a pulse has occurred...
View full post »

Similar threads

What components are inside the input module of the MC12079 IC for UHF division?
Replies
3
Views
1K
Hillbilly Fractal Antenna Reflector (and digital TV antenna suggestions)
Replies
17
Views
8K
Gain calculation of tube class AB output stage
Replies
10
Views
2K
"Ground" and "Center Tapped" Power Transformer Secondary in guitar amp
Replies
6
Views
3K
B J.J. Thomson's Coaxial Cylinders
Replies
6
Views
2K
3"x3" steel tube, Structural engineering question
Replies
12
Views
842
UHF HDTV reception (Freeview) in the UK
Replies
19
Views
3K
Bench test AC transformer from stereo tube equipment
Replies
9
Views
2K
What Are the UV Radiation Risks of Using a Thyratron Tube?
Replies
3
Views
2K
I How to calibrate a NaI(Tl) scintillator?
Replies
13
Views
9K

Hot Threads

Recent Insights

Back
Top