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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