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CD-4 demodulator questions

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gvl_guy

300 Club - QQ All-Star
Joined
Apr 23, 2019
Messages
311
Location
Greenville, SC (via NYC, Philly, SoFL)
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!
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Q-Eight

2K Club - QQ Super Nova
Since 2002/2003
Joined
Sep 30, 2003
Messages
3,265
Location
Castlegar, BC, Canada
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.
 

Doug G.

1K Club - QQ Shooting Star
Joined
Jul 8, 2007
Messages
1,838
Location
Austin, Minnesota
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
 
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