G4120 BBC seal TRIOTRON large mesh plates cup getter 1561 U12 U14 rare

Description

This is a TRIOTRON balloon shape type G4120 one of the rarest audio rectifier you may get around!

Dated circa 1930 it comes with perfect shape, where plate can be easily seen!

Comes with BBC seal on glass!

Two springs each side of anode are held by a thick glass rod to avoid vibration.

Can be used in place of U10 U12 U14 with stunning results.

This valve has been tested and it is 100% working order.