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Base Octal (Int.Octal, IO) K8A, USA 1935
Filament Vf 5 Volts / If 2 Ampere / Direct
Description 2.8KV PIV, 165mA max DC.
Same as 5R4GYA, but low-loss base not specified.
https://www.radiomuseum.org/tubes/tube_5r4ga.html