Six Weeks of Troubleshooting...I think I found it!

[Penthode]

Originally Posted by Kevin Kuehn

Congratulations on finding the bad regulator and hopefully it solves your issue. The HP 8601 along with the HP 8600 Digital Marker combination are most likely the best relatively modern thing going for TV alignment. If you feel challenged while troubleshooting those two, you'll be horrified of the 8664's internal complexity, as well as the 8662. They are not at all user friendly service wise.

Yes the overall challenge is what I am afraid of. There is also a factor of trust with the equipment as the complexity removes you from the actual task.

The main pros of the 8600a/8601a are multiple accurate markers, marker adding does not interfere with the displayed frequency response and simple sweep and frequency and amplitude controls.