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I don't know what it means to "Detune" the T-113 secondary. I know it's the adjustment on the bottom of the transformer can but I don't understand the term detune. Detune how? What am I looking for that indicates the secondary is "detuned"?
As for the next step with injection of the 21.25mc signal at 100mV into the second sound IF grid (V117 pin 1) when I get a DC voltage read I'm trying to peak, we're talking a maximum of around 30mV. Does that sound reasonable?
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