I have my SB220 back on the bench, and just noticed the high voltage secondary wire of the plate transformer going to B+ read "RG58U" on the side of it!!! So naturally, I proceeded to rip it out of there, only to discover someone had spliced the original wire and used a length of outer jacket from a piece of RG58u to insulate a previous splice.. The splice was also heatshrink insulated underneath the rg58u jacket. The original (it looks like the old asbestos type) coming out of the transformer is about 2 inches too short. At least whoever did this was smart enough to sheath the two secondary wires with some 40KV PTFE "conduit" for the entire length run. I plan on reusing that nice sheath. Anyhow, while I wait for the replacement HV rated wire to be delivered, is it kosher to splice HV wire in the first place? And is there any special procedure for this?