[Hammarlund] [Bulk] Re: Tube shields and heat

[Bill]

All this redesign of tube shields, make me wonder why the engineers that 
designed then didn't think of some of these tips...OR they designed them 
to work in the way they do.
Bill W2CQ


On 9/27/2014 2:54 PM, Kenneth G. Gordon wrote:
> On 27 Sep 2014 at 13:31, Guido Santacana wrote:
>
>> As for tube shields, if they are not IERC shields, paint will not do much.
> Guido: on the basis of experiment, FLAT black painted tube shields reduces
> the heat in the tube by 17%, so yes, it does do something worthwhile. For
> instance, reducing the heat of 300 degrees to 249 degrees, or -51 degrees.
>
> You may not think this is worthwhile, but I do.
>
> According to my reading on the subject, reducing tube heat by even 1 degree
> contributes significantly to longer tube life.
>
>> Better to leave the tubes uncovered and use the fan.
> True.
>
> Ken W7EKB
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