2x (PAIR!) TESLA ECC802S Prototype (12AU7WA E82CC B329) lk. Telefunken 100%, NOS

2x TESLA ECC802S / 12AU7WA. of original TESLA ECC802S tubes. These are industrial-grade tubes made for army or aerospace use, and other demanding applications. PROTOTYPE SERIE! Tube 2: Ia1=4.20mA / Ia2 =4.30mA, S/gm1= 1.30 mA/V / S/gm2= 1.30 mA/V.

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