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The simple drawing I used to explain the test and test circuit.
I will tear down the HP 339A on video to show how nicely these are built. This is one of those rare “all analog” devices that has not digital parts at all, watch out for that video if you like seeing the guts of nicely built equipment.
After this, it’s time to do some THD measurements. I’ve built a couple of nice tube amps with just a DMM, I'm trying to drive my amp MC33941EG(datasheet: http://www.kynix.com/uploadfiles/pdf2286/MC33941EG.pdf) into an appropriate resistive load and measure across that, the amp needs to see the right impedance in order for the distortion measurements to be meaningful.
Thanks for watching.
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