Re: Tektronix 465B Scope - Some problems.
Connect the shorted plates to one of the connections to the deflection amplifiers - x or y as appropriate. The plate pairs will then have a leakage path to earth and also be held at about their operating potential.
The tube's not looking good.... (but check that EHT oscillator supply decoupler - that stage makes quite a racket as it's powerful, having to also supply the tube heater).
Leon.
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