original GECOVALVE U10 tube
G1054  RGN1054
Full Wave Direct Heating Rectifier tube
Vf=4V, If=1A
made in Great Britain in 1940's

grey carbonized plates, reversed cup getter

used tube, tested in conditions f=4V Ua=20V
Ia = 28mA/32mA
 tube is in a perfect technical shape
you will get the tube from the pictures