[radiola]

Hello, I'm new to this forum and can't wait to get started. This radio cabinet is in very good condition. When I received the radio, it just hums lowly, and the volume control does not change this. After changing caps and a few resistors, the set still hums lowly. Now, I checked all the tubes with a nice tester. All are good. One of the 7b7 tubes seems to stay cold after the others heat. I assume I am at the stage where I will be taking voltage readings on all the tubes. Never had to do that before, and it's tight in there. I assume to ground multi-tester to ground end of electrolytic caps. Must the tubes be in to take all the voltage readings?? I have the diagrams of each tube. It IS tight in there. Any suggestions? Much appreciated and glad to be aboard.