Quote:
Originally Posted by kbmuri
So I did a complete IF alignment, by the book. With my crude tools, but I'm sure I nailed it. My Knight am signal generator made sine waves, and I set probe A of my tektronix dual-trace scope to monitor them, setting the sweep to 0.1 microseconds/div (or 1 microsecond per full frame of 10 divisions). Counted the waves by hand to make sure the 2nd-hand Knight generator was dead on. 21.25 Mhz where needed, 23.5, 25.3, 22.0.
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Counting waves isn't really that an accurate way to measure frequency. But it does sound like all the circuits fundamentally are working, but at a somewhat wrong frequency.
Quote:
Originally Posted by kbmuri
Then I used probe B to measure voltage deflection at test points. Had to build a detector probe per the Sams schematic and a resistor-capacitor filter test point and an insulated tube shield with test-clip loop (for injecting signals inductively into the 1st tuner tube). Quite a time-consuming affair.
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After removing the filter test point and reassembling channel 13 of the turret tuner and replacing the tube shield, I re-applied VCR signal. Lost all my sound now, and made crap out of my crystal-clear picture.
How exhausting is that?
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Been there at times... VCRs usually create a signal on either channels 3 or 4. I presume you didn't try to use channel 13 (I've made similar silly mistakes myself... :-) )