[Amps] Tube identification or help please

[CLIVE COLLINS]

Good evening Gentlemen,
I have a JAN 7C23 tube that I suspect will give me about 2 kilowatts but I cannot find any data anywhere or reference to it.
Does anyone have details please.  The device is a triode and looks like a very large 4X250 with the grid brought out to three pins on the base plus a heater pair with a centre tap.
 
Thanks in advance for any help.
Regards,
 
Clive GW3WEQ