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Visit this seller's eBay Store! TubeMuseum BID 1 FOR THE MATCHED PAIR! AUTHENTIC SIEMENS HALSKE ~ SIEMENS HALSKE PL83 ~ BALANCED MATCHED PAIRS from MUNICH WEST GERMANY PL83 PL83 = N153 = N309 = 15A6 BALANCED & MATCHED 1960''s PAIRS! Actual picures of tube with W.German ≠ factory code with Box Tubes Tested on Amplitrex AT1000 Digital Tube Test System Great Sounding WEST GERMAN workhorse single tube, reproduces sound with accurate tonality. Superb choice for hifi preamps. The PL83 is a Low-Noise rated long-life tube made to last 10,000 HOURS OR MORE. BEAUTIFUL SOUNDING TUBES AS DISPLAYED YOU CAN SEE THE SIEMENS HALSKE WEST GERMAN ^ 1966 ACID CODES IN GLASS REAL SIEMENS FACTORY CODE: mW3 ≠ 9 L = 196 9 ≠ is the symbol of the Siemens Halske Munich W. Germany factory Amplitrex AT-1000 Tested MUSEUM-CERTIFIED Pair 1: (AVAILABLE) 12,500/12,400mA/V & 37.2/37.0mA Pair 2: (AVAILABLE) 12,300/12,200mA/V & 37.0/36.9mA Pair 3: (AVAILABLE) 11,500/11,400mA/V & 36.8/36.6mA Pair 4: (AVAILABLE) 11,300/11,200mA/V & 36.1/36.0mA 10,500/10,500 mA/V (gm) & 36.0/36.0 mA= 100% FACTORY SPEC LOW-NOISE TESTED PayPal Welcome! Visit this seller's eBay Store! TubeMuseum