B36 Osram double triode metal base cup getter code on glass GC 4 and HH 4

Description

The B36 is an audio double triode with a 12.6 Volt heater. It is a British (M-OV) copy of the American 12SN7.

The construction uses a glass pinch and two separate electrode structures are visible within the glass.

The B36 was designed for audio applications and the valve has independent cathodes.  The B65 differs only in heater voltage and current.

The wide glass tube envelope is 28 mm in diameter and excluding the IO base pin length, stands 71 mm high.

The B36 here shown are made by Osram with full cup getter with codes HH 4 and GC 4

They have been tested with AVO VCM 163 with the following measurements:

B36 Osram tested 10mA/10mA 100% emission

B36 Osram tested 9.3mA/9.4mA 100% emission