Hi!
Oscilloscopes with a Y (vertical) bandwidth of typically 20 MHz or greater nearly always use a tube with p.d.a. – post deflection acceleration requiring typically +8 to +14 kV and this is always usually supplied by a TV tube type cavity anode connector, but many lower spec Hameg 'scopes, along with the CRT shown in the circuit–extract the OP provided, do NOT need post–deflection acceleration, and therefore there is no multi–kV to discharge on the OP's tube!
However, the heaters, cathode, grid and the first/focus anodes of the CRT in the OP's extract will still be below earth potential at low –E.H.T., typical. –1200 to –2000V obtained either from a secondary on the mains transformer or a h.f. oscillator, either being fairly dangerous to handle!
However, if you leave the 'scope disconnected from the mains for at least 30–45 minutes, the resistors and potentiometers in the brightness/focus bleeder chain will discharge this voltage enough for you to be able to measure it safely with the 1kV range of a dvm, which you can leave connected until the voltage decays away to zero, when the CRT's base will be safe to handle – taking regard to implosion safety–precautions of course!
Chris Williams