RFT EZ11 Full-Wave Vacuum Rectifier Power-supply glass tube,
used, tested very strong well balanced
Ia1 = 33mA (122%)
Ia2 = 30mA (111%)
where 27mA is 100% for the new tube
I prefer to say that tube is used just to avoid misunderstanding,
but the tube seems to be never used according to its very high emission and looking
made in Germany in 1950's at former Telefunken Funkwerk Erfurt plant.
this is the great tube for power supply unit for EF12 EF14 VF14 based preamps.
you will get the tube from the pictures