L63 Osram yellow paper logo ST fat shape smoked glass 6J5G audio valves

Description

It is high time to show one of our favourite valve, the Osram L63 6J5G with gold seal paper on glass.

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 Osram ST fat shape L63 shown here are among the most sought-after valves..

They  have been tested with AVO VCM 163:

Osram L63: tested 9.5mA 100%

Osram L63: tested 9.6mA 100%

Osram L63: tested 10mA 100%

Osram L63: tested 10mA 100%