[james1095]

Yikes, let's take a step back here and make sure you understand how to properly and SAFELY use your tools before you do any more poking around in a tube circuit. You're dealing with voltages substantially higher than what comes out of the wall and if you aren't careful you can easily destroy your test equipment, your radio or worse! Not trying to come off as rude or anything, but this stuff really can kill you.

There are very few measurements of any sort that need to be taken with the equipment powered up. Get in the habit of unplugging it and discharge the electrolytic capacitors before you start poking around.