On Wed, 6 Nov 2013, FranK Turner-Smith G3VKI wrote:

"gareth" wrote in message
...
Then it struck me, that we already have a source of stable coil formers
in our junkboxes, which is B7G and B9A glass tubes!

I thought they were called valves, unless you're a Yank.

;-)

But the valves are the whole tube, he's just talking about using the
envelope, "glass tube", as a coil form.

Might as well just use a test tube for the coil form.

Michael VE2BVW