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[Amps] 811 Plate Color/other tube color/Damage

Subject: [Amps] 811 Plate Color/other tube color/Damage
From: "Pat Barthelow" <>
Date: Mon, 03 Nov 2003 16:51:04 -0800
List-post: <>
rlm Said:

*** The problem is not with the 811A grids, it's melting holes in the 811A plates/anodes due to the increased velocity of electrons because Collins Radio used more than the rated anode V.

There's a great picture of a pair of 4-400As producing lots of power (modulators) at:

Can you guys give an opinion as to whether these 4-400As or other tubes with this plate color are within their long life operating range? In other words, are these in the picture dissapating about 400 watts each? And if 811A plates were the same color, would they be exceeding their dissapation ratings?

Tnx Pat

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