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RE: Need some trouble shooting advice please......

Yes, you can measure it with a meter, although I prefer to use a scope. Being able to see the waveform shape sometimes helps to identify the origin. A scope will also tell you whether it's oscillating, which sometimes sounds like hum. Modelling the PS can provide a lot of insight into how it's functioning and whether it's clean enough. Don't forget to apply a load that approximates the actual current draw. Be careful poking around in the PS with a scope. It's easy to exceed the voltage limits of the probe and/or scope input with tube circuitry. You might need to construct a voltage divider for this use or buy a high voltage probe.




Edits: 10/07/16
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