I managed to pickup a used BK Precision 1474 oscilloscope for $10 and figured it would be a good gamble for the price, I powered it up and the CRT had no spot. I did some hunting and managed to find the original service manual as a pdf, and started working down the troubleshooting chart. I have made it as far as a section that wants me to check the voltage across a "radiator plate". So far I have found absolutely nothing that mentions what this part is, and google just wants to show me car radiators for sale. I am 16, and this is my first scope, so any help figuring out what this is would be deeply appreciated.
Schematics are here (Diagrams and schematics start on PDF page 25.)
Thanks in advance!
EDIT: Thanks for digging into this with me guys! :) The general consensus seams to be that it is some kind of thermal plate on a transistor or something. So I will probe around when I get home, and will update when I do!
I also added a link to schematics for those of you that know more then me to have a look at.