An Ameritron amp I once owned had very simple chimney construction. The red
silcone
chimney edges were butted together flush and then stapled every inch or so with
common metal staples. Simple and worked fb.
Steve wd0ct
> On Sunday 14 September 2003 15:26, ARNE GJERNING wrote:
> snip
> > 3. Make from sheet and secure with NYLON screws and nuts.
>
> I've always been dubious of nylon in high rf fields, although I couldn't give
> examples of why.
> >
> > 4. Make from sheet and use ordinary brown plastic (mylar?) parcel tape
> > gives good
> > results. W2GN made hundreds of these for the ARCOS VHF amps.
> >
> > Use the tube anode as a former, and wrap the teflon sheet around it to
> > make about a half-inch overlap. Then tape crosswise over the joint with
> > a one-inch wide strip of parcel tape, wrapping it over the inside of the
> > chimney too. (I hope that's clear: the tape doesn't go around the tube,
> > it goes around the overlap in the teflon sheet.)
>
> A variation occured to me but i have never tried it. Wind the chimney as
> described, then drill some small holes in the overlap area and use something
> to stitch the pieces together, like sewing - I had thought to use the outer
> from PTFE covered wire, but many other things might work.
>
> Steve
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