"Ei-RC" - Electronic tubes factory ECC81/12AT7 ECC81 is R.F. Double Triode Data Sheet Page 1 of 4 Quick reference data • Anode current Ia=10mA • Transcoductance S=5,5mA/V • Amplification µ=60 Heating Heating is indirect by AC od DC, with serial or parallel supply. Please note that, in case of serial supply, a current limiting device must be inserted in the heater circu