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RE: effect of AC heating on 45 DHT filaments ...w/graph

Posted by deathtube 667 on June 18, 2015 at 16:09:43

In Reply to: RE: effect of AC heating on 45 DHT filaments ...w/graph posted by 91derlust on June 18, 2015 at 15:07:27:

My AC line operates at 60 cycles, not 50.

The measurements on the graph were taken at 1.15W power output.

The 60 cycle hum was down -76.6dB from the test tone.

When I changed power output levels to .25W , the 60 cycle hum increased to -70dB down from the test tone.

The 940 and 1060 sidebands went down to -90dB from the test tone.

Why that happened I am not sure, but I can't measure any mVAC at the OPT secondary with the input jacks shorted on my DMM.

I didn't take any IMD measurements.

Edits: 06/18/15

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