I just received this 21EVP4 and will attempt to replace the nearly dead 21EAP4.
It appears to be physically identical. As for the CRT data, all I have is what's at the radiomuseum.
http://www.radiomuseum.org/tubes/tube_21evp4.html
2.68 volts at 0.45 Amps. So I figure I can add a current shunt across the filament to handle the 600mA string.
Does anyone have data on the G1, G2, G4 and anode voltages ? Is it identical to the 21EAP4 ?
