This part is a kind of semiconductor called ECC81.

Function of this product has Double Triode.

Manufacturers : Ei-RC

Image and pinout :

Some of the text within the PDF file :

"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 circuit for limiting the current when switching on. Heater voltage Heater current pins Vf 6,3 12 (V) If 300 150 (mA) 9-(4+5) 4-5 Telephone: FAX: Postal address: Electronic mail: Web site: +381 18 550 741 +381 18 550 806 Bul. Sv. Cara Konstantina 80-86, 18000 Nis, Yugoslavia eirc@eierc.com http://www.eierc.com/rc/default.htm "Ei-RC" - Electronic tubes factory ECC81/12AT7 Dimensions and connections Base: Noval Data [ ... ]

ECC81 PDF Datasheet Download