Cant say for 100% certain on that model but in general terms the focus control is usually situated on the side of the EHT transformer that faces out towards the back of the set and is located near the bottom of it, and "NOT" anywhere near the top where the red 25KV lead to the tube comes out of. (DANGER!!) If you see the adjuster (usually recessed slightly) use a super insulated flat screwdriver to very slowly turn it either way until you get the desired result.

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