Item Tag: 12AX7

ULTRA RARE BELVU PAIR 12AX7 – ECC83 – SILVER PLATES – ECC803S Triple micas

ULTRA RARE ECC803S – ECC83 – 12AX7 – 5751 SILVER PLATES TRIPLE MICAS SIMILAR TO TELEFUNKEN NOS VINTAGE TUBES – EARLY PRODUCTION from private collection PAIR OF BELVU TUBES made in FRANCE ******************************** TESTED ON AMPLITREX WITH ACCURATE VALUES first tube : 87% and 81% second tube : 81% and 93% GM values PERFECT FOR AUDIO ********************** PAYMENT PAYPAL SHIPPING $30 by registered airpost

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2x (PAIR!) TESLA ECC83 (12AX7, ECC803S, B339) 100%, 1961-2

2x TESLA ECC83 / 12AX7 You are bidding on 2 pieces (matched pair!) of *original* 1961-2 TESLA ECC83 tubes. They feature foil disc getter on a large and robust support, smooth folded plates, non-corrosive pins and yellow prints.One tube has a military ‘crossed swords’ marking! 100% guarantee original Tesla, NOT JJ, not re-branded RFT. Tube 1: Ia1= 1.80 mA / Ia2 = 1.90 mA, S/gm1= 1.40 mA/V / S/gm2= 1.60 mA/V Tube 2: Ia1= 1.70 mA / Ia2 = 2.30 mA, S/gm1= 1.40 mA/V / S/gm2= 1.80 mA/V …where a new/unused tube should have around S/gm = 1.60 mA/V, “good” value for transconductance starts at 1.2 mA/V. Close date codes: 3/1961 ; 1/1962 Extremely high quality audio tubes for hifi/high-end/guitar amplifiers. Combine shipping is possible !———————————– ->SEE MY OTHER ITEMS<-

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