Heathkit Oscilloscope If I Pull The Modulator Tubes Hum Disappears So Started Investigating Audio Circuits Injected A Signal At Mic Input And 10 18

heathkit oscilloscope if i pull the modulator tubes hum disappears so started investigating audio circuits injected a signal at mic input and 10 18

heathkit oscilloscope if i pull the modulator tubes hum disappears so started investigating audio circuits injected a signal at mic input and 10 18.

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