The OP70/1000 DHT TRIODE produced by TUNGSRAM in the mid-1930s is certainly an exceptional RARITY! This is a stunning, totally identical PAIR, in practically NOS condition (we assume they are truly NOS even if without the original box), both physical and electrical, with test results above 100%. Like many famous Transmission Triodes (RS237, VT-4 or 211, 845, RV239, LK7115 and others) this OP70/1000 is also a Final Power Triode born and conceived in the Military sector for use in Transmission. Its characteristics, like the aforementioned others, make it excellently suitable for AUDIO use, in SINGLE-ENDED configuration, for amazing DIY projects. Particularly interesting as a driver valve can be the 10 = 10Y or RS242 or RS241 Telefunken. The sound performance is undoubtedly HIGH. The OP70/1000 is imposing with an elongated hot air balloon bulb, a unique BLACK plate, three inverted V filaments with DOUBLE ceramic structure for suspension, naturally, by spring and finally a wonderful chromed metal base, in the present pair, in excellent condition. flawless! Double Reversed Disc Getter Support. We highlight that the "Pin-connection" is "proprietary" of this valve and must be considered in case of replacement with similar valves! We note that the dark color of the "flashed area" is totally normal for this type of old tubes.
EQUIVALENT/SIMILAR: 75-100 Thermion = MC1/50 Philips = T1060 Radio-Record = P41/800 Tungsram = E.60M SFR = TM100 Mazda
PLEASE NOTE :
- THE EXACT CORRESPONDENCE OF THE PINS IS INDICATED ON THE JUMBO 4-PIN BAYONET TYPE BASE/SOCKET (BYY) (TOTALLY ERASABLE!)
- THE PRODUCT WILL BE SHIPPED IN DOUBLE BOXES, OVERSIZED PACKAGING FOR MAXIMUM SAFETY !
- TESTS CARRIED OUT ACCORDING TO CHARACTERISTIC CURVES: Va = 400 Volt - Vg = - 15 Volt ( DOC CURVES )