[Amps] Life of tubes in ham service

[Roger (K8RI)]

Silicone rubber sheet wrapped into a cylinder works fine and requires no 
machining. The ends simply overlap. The joint can be made a number of 
ways including RTV. There was a RED high temp RTV available at one time 
although the regular "Silicone" RTV should work  (smells like Acetic 
Acid). Alpha and others have used this for years.  !/16th" Teflon sheet 
should also work fine, but OTOH it is slippery and not as easy to work 
with. .  The nice thing about using sheet is adding a taper is simple. 
Speaking of simple, working with these sheets is simple and requires no 
special tools.

At one time I had a bunch of the red, high temp rubber and the red high 
temp Silastic RTV


I believe the 1/8th inch Silicon rubber might be available at many 
automotive shops.

73, Roger (K8RI)

On 12/28/2017 Thursday 6:39 PM, Stan Gammons wrote:
>
> On 12/28/2017 01:15 AM, Roger (K8RI) wrote:
>> "I think" the GI-7B would be an easy tube to convert to transverse 
>> cooling to replace the no longer available Eimac tubes in the 
>> MLA-2500s.  The coolers are easily replaced by removing a single 
>> screw. A lathe and mill could easily build custom radiators. It'd be 
>> a simple, straight forward conversion.  IM products?
>>
>> 73, Roger (K8RI)
>>
>
>
> I haven't decided on the cooling method. But it will probably be 
> something along the lines of a plexigass cages with the fan mounted so 
> the air flows up around the tubes and out the holes in the top of the 
> cage.  I've seen some use a machined piece of teflon for chimneys. A 
> piece of teflon tubing that size is rather pricey though.
>
> I ask on this list about IM products awhile back and the general 
> consensus is it's not a problem.
>
> Seems like the MLA-2500 is one of the many amps that others have 
> converted.
>
>
> 73
>
> Stan
> KM4HQE
>
>
>
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-- 
Roger (K8RI)


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