RCA 9TC240 Alignment...The start of my education (I hope!)

[old_tv_nut]

Extremely accurate test gear is not so important in alignment EXCEPT for accurate frequency marks. Most of the alignment steps will be to peak or null the response at a certain frequency, or make two peaks of a double-peaked curve the same height, or make a particular marker 50% of the peak, for example. So accurate actual height of the curve is mostly irrelevant as long as you get the specified shape vs. frequency.

The touchiest part of the procedure often involves the signal injection cable/circuit, the ground point, length of leads, etc.

[Chris K]

Originally Posted by old_tv_nut

Extremely accurate test gear is not so important in alignment EXCEPT for accurate frequency marks. Most of the alignment steps will be to peak or null the response at a certain frequency, or make two peaks of a double-peaked curve the same height, or make a particular marker 50% of the peak, for example. So accurate actual height of the curve is mostly irrelevant as long as you get the specified shape vs. frequency.

The touchiest part of the procedure often involves the signal injection cable/circuit, the ground point, length of leads, etc.

The Eico does have a variable marker frequency dial with adjustable amplitude but, I can't possibly know if a marker frequency selected on a crudely numbered dial scale is correct. My B&K alignment generator has all of the markers pre set and ready to go...for TVs aligned using frequencies around 20 mc higher.

[jr_tech]

Originally Posted by Chris K

The Eico does have a variable marker frequency dial with adjustable amplitude but, I can't possibly know if a marker frequency selected on a crudely numbered dial scale is correct. My B&K alignment generator has all of the markers pre set and ready to go...for TVs aligned using frequencies around 20 mc higher.

Does your digital oscilloscope have a frequency read out?

jr