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Based on the tube lineup, your set is not the H1 chassis, the earliest model. I had the H1 chassis and it had different HO and damper tubes (12GE5 and 12AX3).
My set developed a heater-to-cathode short in one of the CRT guns. Since there was already an isolation transmission transformer in the CRT filament circuit, I simply removed the 220K resistor tying the CRT filament to +145V.
Later on, I came across the later version CRT (11WP22) and replaced the 11SP22. The improvement was quite noticeable due to the smaller dot size of the 11WP22.
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