In a message dated 5/23/2010 11:16:53 A.M. Eastern Daylight Time, km1h at jeremy.mv.com writes: At 2700V @ 400 ma it doesnt matter if its CCS or not Carl, how do you account for a pulse rating on a tube? For a 3cpx1500a7 tube the plate current is 50AMPS and the Anode V is 10KV and the output power is 306KW!! Is it not a Po vs time?