ECC82 12AU7 Mullard 17mm Square getter early 1950s Mullard CV491 1500 1600 etched codes HOLY GRAIL!
ECC82 Mullard 17mm Square Getter k61 code £ 240 pair
ECC82 Mullard 17mm Square Getter Rugged plate 1593 etc £ 750 pair
ECC82 Mullard 17mm Square Getter welded plate 1593 etc £ 800 pair
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