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

To: "Pat Barthelow" <aa6eg@hotmail.com>, AMPS <amps@contesting.com>
Subject: [Amps] Re: 811 Plate Color/other tube color/Damage
From: rlm < <r@somis.org>>
Date: Mon, 3 Nov 2003 18:13:07 -0800
List-post: <mailto:amps@contesting.com>

On Monday, November 3, 2003, at 04:51 PM, Pat Barthelow wrote:


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:


http://hawkins.pair.com/atcitynj/atcity14b.jpg

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?

*** 4-400As/4-250As/3-500Zs and the like show color because such tubes cool themselves mainly by radiation.
...


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