Zenith Color Roundie Alignment with B&K 415

[old_tv_nut]

1) It seems odd that the color oscillator beat frequency should be affected by fine tuning, but is very normal that when adjusted using one source it will be different with another source. It depends on whether the sources are close in color subcarrier frequency or not.

2) At the horizontal sweep rate you are using on your scope, adjust the 3.58 traps for minimum "fuzz" (trace thickness), which is caused by residual 3.58 MHz at the output of the demodulators. You may also be able to see the 3.58 MHz in the picture as a fine, moving dot pattern.

[Electronic M]

Sometimes when chroma osc lock is effected by fine tuning it is a result of the horizontal hold being set to the edge of lock and the flyback winding pulse that gates the burst isn't lining up with the burst.

[bhegges]

I am calling it done. The set has a much better picture, probably not perfect but I am very happy. Maybe related to the full alignment or maybe due to the new to me Blonder Tongue BAVM-860SAW modulator but I no longer get horrible noise during commercials transitions which made it un watchable before. Next will be a final color purity and convergence once I get the set brought into the living room.

A special thank you to old_tv_nut. Your help and advice very much appreciated.

[old_tv_nut]

Pictures, please!

[bhegges]

Some pictures below to include the Danish modern cabinet and also my test bench setup. As I look close I see some ghosting or smearing, maybe an artifact of the setup and adjustments, also the CRT in the cabinet should be a bit stronger so the guns and contrast can come down.

[old_tv_nut]

Thanks!