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Welcome to the VK!
The labels indicate that it's PSU uses SCR. Is important to assure that it and it's vicinity circuts are in good shape, for not making a excessive +B and then damaging flyback and the HOT.
With such symption, is good to check if the HOT and the SCR are not shorted. And see if flyback not have some strange issue visually.
It also have a "startup" trafo; perhaps the light for the channels indicator comes from this.
Is good to locate the schematic, BTW.
PS.: great, a delta-gun CRT!
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