Hello folks: I'm looking at a late 1940s radio that has a lot of the circular flat capacitors that I believe are ceramic and probably pretty durable. They are coded with stripes of red, black and green. The radio also has quite a few parts that are tubular with a slight hour-glass shape. They have the same color reddish brown color as the ceramics and are color coded with the same red, black and green stripes. Are these capacitors? If so, are they ceramic? molded paper?

Funny that they all have red, black, and green colors. Should be different colors for different values unless the same values are used everywhere. The disc capacitors are in deed ceramic disc capacitors. The round hour glass ones are tubular ceramic capacitors. They are encased in some sort of epoxy or something like that. The tubular ones have a thin tube of ceramic with a metal electrode on the inside and outside of the tube. Length and thickness of tube determine capacitance.

Thomas

OK, Thanks Thomas. I had never seen the hour-glass shaped ones. I'll look up the schematic and see if they all have the same values.

:Funny that they all have red, black, and green colors. Should be different colors for different values unless the same values are used everywhere. The disc capacitors are in deed ceramic disc capacitors. The round hour glass ones are tubular ceramic capacitors. They are encased in some sort of epoxy or something like that. The tubular ones have a thin tube of ceramic with a metal electrode on the inside and outside of the tube. Length and thickness of tube determine capacitance.
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:Thomas