U12 Marconi balloon Holy Grail audio rectfiers R2 R3 DW4/350

Description

U12 Marconi balloon shape audio rectifiers, the best of their kind.

Marconi balloon U12 dated circa 1931 with dome or balloon shape, sporting a lovely mesh plate and full cup getter.

The Marconi U12 have been reckoned to be the best rectifiers to use on valve amplifiers with directly heated triodes such as PX4 and Px25 and all equivalents you can possibly imagine.

They do a great job on radios and other devices.

All four Marconi U12 balloon valves have been tested and 100% working order.