4x (QUAD!) TESLA ECC802S (12AU7WA E82CC B329) lk. Telefunken 100%, 1973, NOS 2
4x TESLA ECC802S / 12AU7WA. These are industrial-grade tubes made for army or aerospace use, and other demanding applications. Tube 4: Ia1= 3.10mA / Ia2 = 3. 10 mA, S /gm1= 1.05 mA/V / S/gm2= 1.05 mA/V.