Newbie's First Questions RCA TS 721 Restoration

[Chris K]

Originally Posted by Notimetolooz

Some other generators do have sound modulation. The LGC-396 doesn't seem to.
That generator can only output channels 5 and 6.
That may be a problem if you want to adjust channels 3 or 4 on the tuner so that you can use it with the digital TV converter.

The suggestion that you might be able to use the output from the digital converter to align the sound could be a good one. If you arrange to not receive a station on the convertor it may put out a sound carrier without modulation.
You then might be able to peak the sound IF and adjust the discriminator for zero volts output. Using a scope would be the best way to see the results.
You would first need to make sure the tuner was adjusted correctly.

The Leader has a channel 3 or 4 option for output...not 5 or 6. Its LCG 396...not LGC 396. Maybe that's the issue

[Notimetolooz]

Originally Posted by Chris K

The Leader has a channel 3 or 4 option for output...not 5 or 6. Its LCG 396...not LGC 396. Maybe that's the issue

My typo.

The manual I found doesn't mention options. Perhaps yours is a later version.
http://bama.edebris.com/manuals/leader/lcg396/

You could use a sig-gen with AM modulation (1KHz) on 21.25 MHz to inject the signal at the output of the tuner. Trace it thorough the sound IF with a detector probe attached to a scope. You could not get the sound any further than the discriminator, however you could confirm the sound IF transformers were peaked correctly. You could check the 21.25MHz with a frequency counter if need be.