5963 RCA 12AU7 Square Getter Flat Foil Crossbar, used, tested ok (90-110%) with balanced sections , from 50s, made in USA.
5963 RCA 12AU7 Square Getter Flat Foil Crossbar5963 RCA 12AU7 Square Getter Flat Foil Crossbar5963 RCA 12AU7 Square Getter Flat Foil Crossbar

Platinum matched pairs and quads, rare ribbed black plates, square geter with flat foil crossbar, all the same date codes
 

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