Q: O-12E oscilloscope

[aperkalskite at NDC.CO.IL]

     Dear Heathkit fans,

     I am glad to join you, a while ago I got an old O-12E oscilloscope
     and decided to reanimate it.

     The problem is that I cannot identify one of the missing valves, that
     one that is located on the metal schassis, near the power transformer.
     There is no label specifying its type there.

     Up to now, I have found the schematics for O-11 Heathkit oscilloscope.
     Can anybody advise me if I can refer to it in order to identify
     missing components in my O-12 oscilloscope? What are the differences
     between these two models?

     Thanks in advance,

     Alexander Perkalskite.

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