Meaning of painted tips on Russian tubes???

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I have a box of 50 Russian 1960s vintage 6N1P-EVs. Some have red tips, some have yellow (gold?) tips, and some have no paint on the tips. Anyone know the meaning of the color code?

twystd

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Topic - Meaning of painted tips on Russian tubes??? - twystd 12:06:31 04/15/10 (0)

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