[Amps] Life of tubes in ham service

[Stan Gammons]

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