ECC31 NR73 Mullard A.P.W.1280 6N7GT double triode akin ECC32 full getter

Description

The Mullard ECC31 is a medium μ double triode with a common cathode. The valves you see here are basically ECC31 branded NR73.

The ECC31 has same current and mA/V of ECC32 but different pin’s layout

Valves you see here have full thick getter early type 1950s

All valves tested at 6mA 100% emission