[TinCanAlley]

One more part of the video chain eliminated.

The IF module is not the source of the bars. I installed the new IF and after adjusting the detector output to proper level, the bars are still there. Put back the original IF.

Next in the chain are the ABL, Blankers, 3rd Video Amp and then 4th Video Amp.

So far I've eliminated the tuners, IF, horizontal module, subcarrier module, B+, damper diode/capacitor and 240V Boost diode/capacitor. With all the electrolytics replaced with exact parts noted in SM as well. Transistors on the chassis and horizontal module have been replaced with factory correct.

There is a zener diode on the 4th video amp (emitter to collector/ground). Since this is acting as a voltage regulator, I don't think it can create the kind of noise to cause bars.

I also have checked all soldered ground points on the terminal strips to chassis, shielded cables and on the boards I've tested. I have tried a number of different routings of leads and isolated the yoke leads from all others.

If I never get rid of the bars, I'll still be very please with the overall image quality I've been able to achieve. The bars will be a very small price to pay to have an amazing set.