Rare Mullard CV455 ECC81 Copenhagen Grey Plates 'D' Getter Valve TkP (KM74)

Mullard Philips CV455 ECC81 Copenhagen Welded Plate 'D' Getter Valve TkB (J231). Hickok 1-117-B test = 5200/5200 mhos GM Between the pins ΔB Τkp

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