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I can only think of encapsulation in glass as a perfect seal [valves and CRTs] but the temperature required may be a little high for the component itself.
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I have an early 30's Cossor 533A radio that has glass encapsulated resistors, never seen that before!
The set is still working well (apart from some hum from the smoothing cap)with all original parts, When I get round to restoring it I will check the resistor values. It will be interesting to see if they are still in tolerance.
Mark