Original British made STC 19G2 CV1111 U27 AU5 TUBE
Half-wave High-vacuum rectifier/Power supply
black carbonized plate, extremely huge D-getter, thick ceramic micas
made at STC Paignton tube factory Great Britain
Europe 4-Pin (4A, B4) base
filament: Uf=4V, If=1,1A
the tube seem to be unused NOS, tests very strong:
f=4V - Ua=100V
Ia = 94mA
you will get the tube you can see at the pictures.
I always send the tubes by priority registered mail with tracking number within hours after receiving payment