Quote:
Originally Posted by old_tv_nut
Oh! Revelation! You are using the RF cable, 75/300 ohm switchable, which should only be used for antenna input. Use a plain unterminated cable as shown in the Zenith illustrations, with the RC network of figure 6.
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I am using the Zenith service manual directions coupled with trying to use the B&K 415 and supplied signal cable which is the RF cable with built-in 75 or 300 ohm termination. There are no other signal cables described in their manual, see below. Also the snippet below had me believing I could the supplied cables and use the manufacture's directions, the output switch does have options to output video, IF, ch4, & ch 10, but it is odd to use a RF cable to feed into a IF circuit.
The Zenith service manual directions for the IF alignment steps in question state to connect the sweep and marker signals to the converter control grid (Test Point A on the tuner). No reference is made to any coupling circuit, which matches your note to use a plain unterminated cable. Zenith info below:
