Admiral 14R12 Restoration

[Crist Rigott]

Originally Posted by Electronic M

You only align radios (and other sound IFs) for max output from slugs. TVs you align the video IF for frequency response, output level be damned. There should be an alignment procedure in the philco manual if you can't undo your work consult the philco procedure. You will need both sweep and marker generators working to see the response curve and know what frequencies important features correspond to.

This is why I always advise not touch video IFs unless you really are prepared to do so. I've not done a video IF alignment yet, but have been grabbing equipment to try it. When I do I plan to do it on a set I don't care about for this exact reason.

Tom,
I was following the procedures from Sams and Riders on this Admiral TV.

The Eico 369 is a sweep/post marker generator.

I'm doing this so I can learn something about TV alignment. I knew it wouldn't be easy.

I'm posting the procedures below so we can see what I'm trying to do. Of course I'm only doing the Video IF and Sound sections for right now.

I do appreciate everybody's comments and willingness to help.

[old_coot88]

Remember that in a TV set, the IF stages are stagger-tuned rather than tuned 'on-peak' (as in a radio). Stagger tuning is for a wide bandpass which is necessary to render fine detail in the pic.

Also the signal level from the genny should be attenuated as much as possible while maintaining a stable trace.

[Crist Rigott]

Originally Posted by old_coot88

Remember that in a TV set, the IF stages are stagger-tuned rather than tuned 'on-peak' (as in a radio). Stagger tuning is for a wide bandpass which is necessary to render fine detail in the pic.

Also the signal level from the genny should be attenuated as much as possible for a stable trace.

I remembered that the Eico 369 manual talked about stagger tuned IF and sure enough the manual talks about adjusting each IF for its own frequency. I looked on Sams schematics and sure enough, there is a frequency marked by each IF coil! However there are only 2 freq. used. Yup, the 25.3 and the 23.1. Which corresponds to the Sams alignment chart.

Hmm....still puzzled on how to actually align the video IF section.