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The large tubes are ham type tubes like 836 and 866. Yes, it's a brass based 01A. The filament is ok but the grid leak is broken inside.
One side of the AC goes right to the chassis ground. The cabinet ground is connected to that via a 1 M resistor and a 0.0047 1.5 kV capacitor. I assume to bleed away any charge that might accumulate.
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