[Amps] Life of tubes in ham service

[Carl]

There is a version for wrapping headers and other exhaust pipes where 
clearance is a problem.

Carl


----- Original Message ----- 
From: "Roger (K8RI)" <k8ri at rogerhalstead.com>
To: <amps at contesting.com>
Sent: Friday, December 29, 2017 8:32 PM
Subject: Re: [Amps] Life of tubes in ham service


> 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
>>
>>
>>
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
>
> -- 
> Roger (K8RI)
>
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
>
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
> 


---
This email has been checked for viruses by AVG.
http://www.avg.com