2x TESLA ECC83
You are bidding on 2 pieces (matched pair!) of *original* 1958 TESLA ECC83 tubes.
They feature foil disc getter on a large and robust support, smooth folded plates, non-corrosive pins, and yellow prints.
100% guarantee original Tesla, NOT JJ, not re-branded RFT.
Tube 1: Ia1= 2.00 mA / Ia2 = 2.20mA, S/gm1= 1.65 mA/V / S/gm2= 1.80mA/V
Tube 2: Ia1= 1.90mA / Ia2 = 1.70 mA, S/gm1= 1.70mA/V / S/gm2= 1.55mA/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. Datecodes: 11/1958 ; 12/1958
Extremely high quality audio tubes for hifi/high-end/guitar amplifiers.
Combine shipping is possible !-----------------------------------
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