B36 12SN7GT Marconi Valve Tube Brown Base Close Matched Anodes NOS

Acid etched B36

Brown base

Clear glass

Square getter

2 rivet welded black wraparound anodes

Marconi sticker

Made in England

Original Marconi boxed

Test results:

V1 – A1 11ma 2.8gm  A2 – 10.5ma 2.7gm

NOS