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This is far from being a new idea but is presented for the benefit of the newcomers. The number stamped on the glass of old tubes is sometimes almost impossible to read. Wipe the tube clean with a soft cloth, then breathe on it as you would to clean a pair of glasses. The condensation of the moisture from the breath on the cold glass of the tube should make the number stand out plainly.
John McMullen, W0YJS.