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Need Help with Tektronix 500 series scopes

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Martin.M:
before adjust anything please check first of all:

PSU; the negative -150V. It must be exactly, there is apot for adjust that.
All other voltages of the PSU use this -150V as reference, means, is the -150V wrong, all others will follow.

Tired tubes can be found by swapping with another of same type, but put each tube back to it`s place bec. some of them are selected, so the swap can modify system acuracy.
To identify a selected tube:

When the first 3 Numbers are 154 it is not selected, is there a 157 it can be a selected single or pair.

Martin

Aperna1985:
Thank you,  where can I check for the -150? I'm really not familiar with the inside of these scopes. I took all the tubes out and tested them 1 at a time on a tube tester,  they actually all came back very strong.  I was hoping for a weak tube.

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