B36 Marconi same etched code on glass LK 4 brown base square getter tested 100%
Marconi B36 tested 100% emission same code on glass GBP 350 pair.
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 Marconi with square getter and they both have the same code on glass that is LK 4!
They have been tested with AVO VCM 163 with the following measurements:
B36 Marconi tested 10mA/10mA 100% emission
B36 Marconi tested 10mA/10mA 100% emission
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