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Nice find on the Philco Diamond D. That TV came out during my tenure at Philco and I rate it among the three best Philco B & W chassis. The originals did have aluminized picture tubes. That TV will show a great picture if it's working right.
Tighten the 1/4 " hex screws on the PC boards as a preventive measure. They hold the PC board to the chassis to complete the circuit ground. Goofy intermittent problems show up if they're loose. Sound detector transformers could also be troublesome. Otherwise only routine maintenance is expected. You will be very pleased with the performance.
Good luck,
Don
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