Medium-mu twin triode

Specifications:

Base	Noval
Uf	6,3/12,6 V
If	0,3/0,15 A
Up max	300 V
Pp max	1,5 W
Typical operation (Class A Amplifier)
Up	250 V
Ug1	-4 V
Ampl	40
Tr	1,75 mA/V
Ip	3 mA