RCA RADIOTRON ER551 551 TUBE
engraved base
Screen-Grid Tetrode
 235 - 435 - C335 - SY235 - UY235
 Vf 2,5Volts, If 1,7Ampere
Tube seem to be NOS, unused, look great, test strong
Ia = 8mA (123%)
Where 100% for the new tube is 6,5mA
Mesh anodes
the tube is in a perfect electrical and visual shape
you will get the tube you can see at the pictures
I always send the tubes by registered priority mail with tracking number within hours after receiving payment
Ramona Rey - Names