I re-read today the data given in the ARRL '97 handbook. The working condition as stated in the handbook does not mention the values are for two tubes; AB2 class amplifier with VA=4000V, VG2=500V, VG1=-60V and IP=300...1200 mA; output power of 3000 Watts. I guessed the idle current was high (exceeding actual plate dissipation) but reading the Eimac data sheet it states those same values but for two tubes, also tube's IP max=700 mA. A typo in the handbook.
Best regards
Guillermo - LU8EYW.