TV Typewriter II

I built one of these when I was 15. It didn't work when I finished it. I sent it to SWTPC for repair. DON LANCASTER himeself fixed it, and sent me a note thatI should get a better soldering iron (a solder bridge and some _horrible, evil_ Molex soldercons (the worst sockets ever made) were responsible for the problems. In any event, I would go down the timing chain; if the 60 Hz is not at some decent level for (the 555's?), you've got problems. Do you have the (unijunction transistors?) in correctly - maybe a case difference between TO-92 and "the other ones, I forget" made of metal?. I have seen a surprising number of bad/mismarked 1n914/4148 diodes surplus. Are the caps and resistors definitely the right values. The R and C values are all critical around here, and I've seen mismarked caps. Hopefully, you have at least a scope. Funny story: my grandfather, who never graduated the 8th grade, a machinist, helped - that is, made - all the cases for my projects out of wood (so much for FCC part B). We were working on his dining room table with the TVT and a modified 9" TV set (which HE had repaired(!). A friend of his, a senior engineer at Zenith, came unpectedly to visit and his eyes just about fell out of his head. "We've got some stuff like that at Zenith - but they won't even let me into that lab, and I've only seen it through a window!!". __________________________________________________ Do You Yahoo!? Yahoo! - Official partner of 2002 FIFA World Cup http://fifaworldcup.yahoo.com