I've made a bloody mess!

[Chad Hauris]

The only test equipment you need is a digital multimeter (or analog voltmeter, but I find the digital is easier to read). Skill and knowledge only comes through experience! The more you do, the easier it becomes.

Troubleshooting always moves from the general or obvious to the specific or concealed. You took care of obvious potential problems such as electrolytics or tubes...that is the first step.

Now you need to start examining the DC voltage readings, starting with the most general...the power supply input voltage to the stage (+405 volt B+). Also it looks like the boost voltage (usually +800 volts or so) comes into this stage. Check the supply voltages against your photofacts. If they are off, then you know that the trouble may lie in the power supply circuit delivering that voltage.

If the power supply inputs are OK, now start measuring the voltages at the 6GF7 tube...check against the photofacts. If you find wrong voltages here, then you know what part of that vertical circuit has a problem.

Do not do component substitution until you have really narrowed down the problem. Checking the DC voltages against the photofacts WILL help lead you to the problem.