VERY STRONG ECC83 / 12AX7 MULLARD 1958, LONG PLATE, HOLY GRA À SAINT MARTIN DU MONT-AIN

Extremely rare tube ECC83 / 12AX7 Mullard, made in England 1958, testing excellent. Mullard Blackburn factory etched code: B8D  =  April 1958. 17 mm Long Plate with copper plate posts. Legendary (for a good reason) Dual Post (aka Goalpost) Getter Support with Large Getter. Made In England 1958, (this design code f91 was in production from 1957-1959). Tube NOS (new old stock), NIB (new in box). Tous mes tubes ont été controlés bons sur analyseur Metrix LX109A (Courant anode Ia, pente S, gaz, court-circuits), Test results: @ Vp = 250V / Vg1 = -2V: Triode 1: Ia = 1,53 mA    Triode 2: Ia = 1,35 mA (100%:   Ia = 1,20 mA)            Garantie satisfait ou remboursé. Registered shipping (with Tracking number), we combine shipping, just ask before paying.