Frank - Congratulations! :-)
C6 is also multi-turn. It is a "piston" trimmer, where turning the threaded adjuster moves a metal piston up and down within a tubular body with the other "plate" of the capacitor wrapped around it. IF you are able to null the CO completely, I wouldn't force it. If not, then you'll have to see what is interfering with the piston under the chassis. One thing I have seen is where someone got too close to the plastic tube with a soldering iron, deforming it and preventing the piston from going any further. Hopefully that's not your problem.
Let us know what you find! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs <www.k4oah.com> iz oos wrote:
Hi! Homework complete! Yes, Garey was correct !!! The RF Output meter was not sensitive enough to balance the Balanced Modulator and I think I followed his procedure! I connected a Drake 2-C, with the mute cable and the antenna cable connected to the rx output of the T-4XB and then "spotted", so that the RX and the TX were at the same frequency. The 2-C was set at with the function EXT-mute. Then, with the "Transceive function of the T-4XB set at SPOT", I tuned up in the TUNE position on LSB, then switched to CW and closed PTT. Then I listened on the 2-C for the "suppressed" carrier. Set AVC to FAST, and adjusted the Carrier Balance control (10 turn pot) and C6 for minimum S-Meter reading. I could see the difference moving the Carrier Balance pot on the RX s-meter !!!. While the Carrier pot can be moved by 10 turns or so, C-6 seemed to move by just 90 degrees (a quarter of turn). I didn't want to force it as I was afraid to break it. Do you know if C-6 moves just by that little? 73, Frank IZ2OOS
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