I would say that, considering the idle plate dissipation is 260W/tube, that
some color would be expected.
At 19:25 2006-07-09, w2cqm@juno.com wrote:
>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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