L63 M.W.T. Marconi Wireless Telegraph black base tall glass large decal 6J5G audio valves

Description

The L63 was first introduced in 1938 as a valve with octal base made by the MO-V.

The American counterpart was named 6J5G.

With 6.3 Volts heater it is basically half a 6SN7GT. Basically two L63 make one 6SN7GT!

The M.W.T. Marconi Wireless Telegraph L63 shown here are among the most sought-after valves.

Codes on glass are very close each other so that means same year production..

They have been tested with AVO VCM 163:

M.W.T. Marconi Wireless Telegraph L63: tested 9mA 100%

M.W.T. Marconi Wireless TelegraphL63: tested 10mA 100%

M.W.T. Marconi Wireless Telegraph L63: tested 9.5mA 100%

M.W.T. Marconi Wireless Telegraph L63: tested 9.3mA 100%