[Techtoolslist] Problems with Tektronix 475 Scope

[Matthew Rossiter]

Hi Everyone,

I'm starting to have some issues with my Tektronix 475 scope where after 
it warms up for about 5-10 minutes the beam goes out.

If I press the ch1/alt/add or ch2 buttons I see the beam flash on/off.  
Same if I turn the trigger or delay knobs it comes in and out.

Pushing the chop button brings both ch1/ch2 beams on for some reason.  
After a while the beam will come back.   Letting the scope cool off will 
normally bring the beam back.

Last year I did clean some contacts - this seems to be heat related 
though.   Has anyone seen this?   or is there forum out there that 
someone recommends specifically for old tek scopes?

https://youtu.be/GZxO8YkzaBM

Thanks!

Matt