I'm not sure if you thought of this, but there are
a few guys who do nothing but part out Heathkits
and sell the parts on eBay. Right now there's a
DX-40 PA coil going for a few bucks. I've seen
tons of AirDux styles (such as the DX-40), and
also fiberglas and ceramic tanks from later
Heathkits. I picked up a PA tank (ceramic form)
for a TX project I'm planning. Often the PA
tank switch is included, along with the standoff
insulators. Worth a shot if nothing pans out here.

Pete k1zjh