Oh... And I have used small screws, (2-56) and nuts to hold Teflon sheet
together for tube chimneys.
73
Jim W7RY
Happy New Year!
-----Original Message-----
From: Jim W7RY
Sent: Friday, December 29, 2017 7:46 PM
To: AMPS
Subject: Re: [Amps] Life of tubes in ham service
Lots of Teflon and silicone on eBay.
I have also successfully used turbo charger hose. Buy it by the inch. I use
it on my 3CX800 amplifier. It's silicone sheet with a cloth cover. Used to
connect the exhaust system to a turbo charger on truck and heavy equipment
engines.
73
Jim W7RY
-----Original Message-----
From: Roger (K8RI)
Sent: Friday, December 29, 2017 7:32 PM
To: amps@contesting.com
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
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Roger (K8RI)
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