Heathkit IO-21 oscilloscope

[JerkStore]

     Hello everyone.  I recently acquired a heathkit IO-21 General Purpose o-scope and would like to make it functional again. I have a good understanding of electronics, but not a lot of experience with tubes. I found an older thread on this site concerning the same scope and everyone was very helpful. I am heading out soon to get a copy of the schematic made, and would appreciate any help I can get. Thank you in advance.

I did plug the unit in and it does power up. I get an oval-ish dot in center of screen and no response from any knob turning.

[JerkStore]

Photo

[shooter]

here's the schematic;

http://www.nostalgickitscentral.com/heath/schematics/heathkit_schema_io21.pdf

standard troubleshooting,  physical inspection, DC volts,.....
only real difference between sand n glass is how bad it hurts when you put your fingers where they shouldn't be 

[John]

http://www.antiqueradios.com/forums/viewforum.php?f=8&sid=2c6d7b6063eacf13abd9c4af2514a802


Right there is the site to visit. Do a good search first, that will answer many of your questions, and keep the guys from getting aggravated off the bat. ;)


Be careful poking around in there, I believe you'll find 1600 or so VDC. At least I did, while testing one that "didn't power up".