Troubleshooting a Tektronix 454 scope

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GarryE

Joined Jan 8, 2020
1
I've got a 50 year old Tektronix scope 454 where the Z axis barely works. The trace is visible when the intensity (brightness) is turned all the way up. Then a minute later, the trace fades away. Has anyone ever worked on the Z axis HV on a scope?
 

AlbertHall

Joined Jun 4, 2014
9,009
I've got a 50 year old Tektronix scope 454 where the Z axis barely works. The trace is visible when the intensity (brightness) is turned all the way up. Then a minute later, the trace fades away. Has anyone ever worked on the Z axis HV on a scope?
There are some high value resitors in that circuit and they tend to brcome higher values with the passages of time. After @dl324 suggestions, suspect high value resistors in the Z circuit.
 
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