Marconi B63.


New old stock.


Unused.


Grey glass.


Black base.


AVO Tested.


Original Marconi carton.


Test results for this valve:

Ia (mA) : 12.5
Gm (mA/V) : 3.3

Ia (mA) : 10
Gm (mA/V) : 3.0

This valve tests 100%


Data Book Specification:

Ia (mA) : 9.0
Gm (mA/V) : 2.6

Shipping:


Tracked shipping.


Any questions, please ask.


I combine postage.


No shipping to Russia.