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Do It Yourself (DIY) paradise for tube and SET project builders.

RE: Does the speaker side of the transformer have the negative lead grounded?

I'd suggest clip leading RCA shell, negative side of speaker connection, power cord ground, and the ground lead of probe all together. You need them to all be at the same potential. Do all of this with the amp off.

With a RCA shorting plug in place I don't think you will see so much.....partly depending on if it is a push pull or SET amp.

If I'm looking to measure ripple voltage I do it at the power supply caps. AC coupling only....auto trigger works okay to start with.


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