Alright. I have a Heathkit io-10 that I got from a garage sale, guy said it worked. Of course I got home and pluged it in and it did not. I just got a green dot in the center of the screen. Befor this I had never worked with vacuem tubes before, but I am willing to try. I found a manual and a schematic, took the bad boy apart and started to check connections, solder joints, and what not. Found one cold joint and a loose wire but over all from what i can tell the guy followed the directions to a t. Fixed these problems, powered it up to check the tubes. v10 the 6x4 tube didn't light...replaced it. the new one would start to heat up then spark on the inside a little and fail, figured it was a bad tube. I got another one, this one sparks on the inside a bit but doesnt fail like the last one. Though, now there is arcing across pins 4 and 5 on the v8 IV2 tube and this blows the 1/2amp fuse when it happens. Again i figure bad tube, so i replace it. Arcing still hapends. Could it be a bad transformer? attached the schematic, need the manual?
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