CD-4 demodulator questions

[gvl_guy]

I have a Sansui QRX-7001 with a built-in CD-4 demodulator. When I try to set it up using the test tone record, I can't seem to get the carrier level right. If I turn the adjustment knob all the way to the left, sure, I can tell the level isn't correct. But when I turn it a little to the right, it clears up. But then I can keep turning it all the way to the right and it stays about the same. Does it matter? (I know some demodulators don't have a carrier level adjustment.)

Also, I've noticed that I can also adjust the right front/rear separation with no issues. (It's pretty awesome, actually.) But the left front/rear separation is not so good. Any ideas what could be going on?

Thanks for your help!
--------------
BTW, check out my new Facebook group for "old school" quad.
https://www.facebook.com/groups/475618800025161/

 

[winopener]

A pot going bad?

 

[Q-Eight]

Sounds more like you need to align your cartridge. I had similar issues with my setup where the right side demodulates fine, but the left side was splatty. Once I obtained a GeoDisc, I was in CD-4 Nirvana.

 

[gvl_guy]

Sounds more like you need to align your cartridge. I had similar issues with my setup where the right side demodulates fine, but the left side was splatty. Once I obtained a GeoDisc, I was in CD-4 Nirvana.

Wow. Yes. Sounds like an excellent idea! Thank you!

 

[Doug G.]

Yes, THE two most important aspects of CD-4, other than having a working demodulator, of course, are making sure the ultra sonic signals are not lost between the turntable and demodulator via low capacitance cables and getting cartridge tracking just right.

Doug