Hi,
for gold plated ones i use tarn x once and clean it afterwards with a cotton pad or with a fabric for plexi glass. For non plated ones emery cloth 1200 till pin colour is uniform and then with pure alcohol. Lettering on most vintage tubes is very sensitive and will go away with time and when cleaning dry the envelope.
for gold plated ones i use tarn x once and clean it afterwards with a cotton pad or with a fabric for plexi glass. For non plated ones emery cloth 1200 till pin colour is uniform and then with pure alcohol. Lettering on most vintage tubes is very sensitive and will go away with time and when cleaning dry the envelope.