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Just got 130A. What should I do next to repair?

Question asked by PeterChoi on May 31, 2010

I'm a newbie here. Recently I got a HP 130A CRT type oscilloscope with the manual. However, it shows a dim vertical bar on the CRT under the dark light. Therefore, CRT and Power supply may be OK. I suspect that tubes and capacitors could be an issue. I have a vacuum tube tester and I will check all tubes in it. Secondary, the I am scared with the high voltage when I test it. Any basic troubleshooting steps with the oscilloscope? I made several tube amps before as a beginner. Thanks in advance.  :?: