I'm working for the first time on a pair of 3-400Z's in a Swan Mark I. On both the high and low power position,   the amp is making exactly the instruction  manual's specified idle current. Plate voltage is 2900VDC and idle current is 180ma.  With key down and no excitation at this level,  the tubes begin to glow  to a  color that  I consider to be a bright red. The plate current meter shows no rise in current draw during this entire  process.   The amplifier loads perfectly and when driven with 100w ,  power output is about 1100W. The question is whether this "glowing"  is the normal characteristic of a  pair of  Eimac tubes?? Any comments will be appreciated. Ron W2CQM/3 



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