A double triode with an indirect glow oxide cathode - 6N5S is installed in output two-stroke cascades of powerful low-frequency amplifiers, as well as in voltage stabilizers for various purposes. The radio lamp is made in the form of a shaped glass bulb, equipped with an eight-pin octal socket with a key. Known foreign analogues are ECC230, A4475, 6AS7G, 6520.

Basic technical characteristics

• Passport voltage on each anode: 135 V.

• Nominal current in the circuits of each of the anodes: 100 mA.

• The average value of the current in the glow circuit at a voltage of 6.3 V: 2.5 A.

• Internal active resistance: 450 ohms.

• Input/through/output electrical capacitance of each triode: 9.5/9.5/5 pF.