Thanks for all the helpful responses. I found a Final Choke complete with the tube HV metal caps on eBay. Also ordered final amplifier rebuild parts such as capacitors and resistors, etc., from K4EAA. I've ordered a lot of stuff from him and his XYL over the years including that poster-sized TS-830 Schematic which I Framed for the ham shack. I'll keep you all posted on how the repairs are going. My concern now is why, when I plug the rig into 110 vac, it still crackled and emitted smoke, even though no key down or other actions which might put it into transmit.