This thing acts strangely... one measurement and it is open and on another it is fine. I removed the tube and did the soldering trick and seemed to get good continuity right afterwards, but hours later I measured open again. Waited a few minutes and it was fine again. This is using ohmeter, not filament voltage. So I hooked up 6.3vac directly and so far all is well. The filament glows and has on repeated occasions. I sure wonder why the ohmeter varies from time to time. If someone has seen anything like this before, let me know. BTW, thanks for the very helpful advice, this may have saved me a lot of trouble and money... knock on wood. I will keep you posted. For now, tube is out and I am cleaning chassis and reforming some lytics before I reinstall.

Dan