• QuadraphonicQuad welcomes you and encourages your participation! Treat all members with respect. Please keep all discussions civil, even when you have a strong opinion on a particular topic.

    Do not offer for free, offer for sale, offer for trade, or request copies or files of copyrighted material - no matter how rare or unavailable to the public they might be. We do not condone the illegal sharing of music. There are many places on the internet where you can participate in such transactions, but QuadraphonicQuad is not one of them. We are here to encourage and support new multichannel releases from those companies that still provide them and as such the distribution of illegal copies of recordings is counter-productive to that effort. Any posts of this sort will be deleted without notification.

    Please try to avoid discussions that pit one format against another. Hint for new users: make liberal use of the search facilities here at QuadraphonicQuad. Our message base is an incredibly rich resource of detailed information on virtually all topics pertaining to surround-sound. You will be surprised at what you can find with a little digging!

JVC CD-4 demodulator 4DD-10

Help Support QuadraphonicQuad:

Manimarco

Member
Joined
Feb 2, 2018
Messages
10
I recently picked up a Technics quad (It is in another post) But i got this also, A JVC CD-4 demodulator 4DD-10. I have never used one but thought it might be good to have with the Technics. Any info on this would be great. ThanksCIMG3141.JPGCIMG3142.JPGCIMG3143.jpg
 

Manimarco

Member
Joined
Feb 2, 2018
Messages
10
Well I can't find much info on this and I don't have a quad TT so on ebay it goes!
 

sjcorne

2K Club - QQ Super Nova
Joined
Jan 1, 2010
Messages
2,629
Location
Southern NY
Well I can't find much info on this and I don't have a quad TT so on ebay it goes!
No such thing as a "quad TT"...to get good CD-4 performance you can use any model as long as it has short and low-capacitance cables. You do need a quad cartridge (with a shibata tip stylus) though. For CD-4 playback I use a Technics SL-1500 with a JVC 4MD-20x cartridge.

To properly use the demod you have to run the turntable wires into it, then run the 4 channel outs to a receiver. You then need a special adjustment record to properly tune the separation and carrier controls.
 

quadanasaziland

500 Club - QQ All-Star
Since 2002/2003
Joined
Mar 13, 2002
Messages
579
Location
never never land
No such thing as a "quad TT"...to get good CD-4 performance you can use any model as long as it has short and low-capacitance cables. You do need a quad cartridge (with a shibata tip stylus) though. For CD-4 playback I use a Technics SL-1500 with a JVC 4MD-20x cartridge.

To properly use the demod you have to run the turntable wires into it, then run the 4 channel outs to a receiver. You then need a special adjustment record to properly tune the separation and carrier controls.

Well I guess, technically but in the 70's there were lines of "quad tables" by Sansui, Dual, JVC, Pioneer and others that featured the low capacitance connects and Shabata style tips that played cd-4, sq, qs and stereo lps so one TT did every thing.
 

winopener

2K Club - QQ Super Nova
Since 2002/2003
Joined
Mar 2, 2002
Messages
3,692
Well I can't find much info on this and I don't have a quad TT so on ebay it goes!
You may regret it... i have one of these and works very well with several cart, among these the Audiotechnica 331LC and the 440ML. Slightly better than the 4dd5.
Have also a Groovetool still packed that waits for a test with CD4 records.
Unfortunately i don't have any literature on the 10.
 

Manimarco

Member
Joined
Feb 2, 2018
Messages
10
You may regret it... i have one of these and works very well with several cart, among these the Audiotechnica 331LC and the 440ML. Slightly better than the 4dd5.
Have also a Groovetool still packed that waits for a test with CD4 records.
Unfortunately i don't have any literature on the 10.
I don't really know if I will need it. My Technics SA 8000X has demodulation in it but it may not be anywhere as good as the JVC?
 

winopener

2K Club - QQ Super Nova
Since 2002/2003
Joined
Mar 2, 2002
Messages
3,692
I don't really know if I will need it. My Technics SA 8000X has demodulation in it but it may not be anywhere as good as the JVC?
I am not sure about the CD4 circuit into the SA 8000X, but if it is the same as their standalone cd4 decoder, it need a special cartridge (semiconductor).The 4dd10 works with all carts.
 

Quadzilla

Exiled QQ Veteran
Since 2002/2003
Joined
Jul 9, 2003
Messages
2,179
Location
London, Ontario, Canada
I am not sure about the CD4 circuit into the SA 8000X, but if it is the same as their standalone cd4 decoder, it need a special cartridge (semiconductor).The 4dd10 works with all carts.
There is a switch on the back of the Technics to choose between semiconductor and moving magnet cartridges.
Don't forget to clean the cartridge selector switch as well as the CD-4 subcarrier level adjustment switch above it.
Use DeoxIT, because they could have been left in the same positions for many years ... https://www.parts-express.com/caig-deoxit-d5s-6-spray-5-oz-with-perfect-straw--341-200
 

Attachments

Last edited:
Joined
Mar 25, 2014
Messages
297
Location
Massachusetts
If you haven't put the demodulator up for auction yet, it's worth trying it out versus the onboard demodulator in your Technics receiver. If it actually performs as good or better than a 4DD-5 like winopener says, then it's probably a pretty good unit. I was going to say that it looked relatively equivalent to a 4DD-5 in terms of controls an connections. Actually, looking through my photographs, that is a JVC re-badge of a Victor CD4-2, and I've almost never seen either model. The thing that tipped me off to look was the separation controls on the front - Victor was considerate about putting them on the front instead of the back, where you have to struggle with wiring to to adjust them during set-up.
kokoko83939-img600x337-1435929822n1v68e29904.jpg
 

The Quadfather

Moderator
Since 2002/2003
Joined
Mar 7, 2002
Messages
1,535
Location
Dixie
JVC demodulators aren't a rebadge of anything. JVC invented CD-4 and all their demodulators are pure JVC. More than likely, the Victor demodulator you speak of is actually a JVC. Some of the Marantz demodulators also had JVC boards in them. Same with Sylvania. (just a rebranded JVC 4DD5) The JVC demods are some of the best. I think the 4DD10 was an enhanced 4DD5 and has discrete components in it's preamp instead of integrated circuits. Otherwise very similar. The frontal controls are nice but not necessary. Once they are set, you don't have to mess with them. I see you posted in February, It is now August. If you did sell that demod, someone got a good one. If not, hook it up and see if it works. It's worth fixing.
 

bigbillquad

1K Club - QQ Shooting Star
QQ Supporter
Joined
Dec 6, 2010
Messages
1,318
Location
New Zealand . Waitakere
Hi. All

After comments on a JVC CD4- 50 demodulator I bought it a why`ll ago and gave it a brief test it performs better than my 4 DD-5 unit, but I have not done a comprehensive full test yet, does anybody have information on this unit.
Bill...

Untitled_Panorama1.jpg
IMG_3457.JPG
IMG_3458.JPG
 
Last edited:

DuncanS

2K Club - QQ Super Nova
QQ Supporter
Joined
Aug 30, 2012
Messages
4,751
Location
UK

The Quadfather

Moderator
Since 2002/2003
Joined
Mar 7, 2002
Messages
1,535
Location
Dixie
Wow, I've never seen one with delay controls. I suspect that's to fine tune the delay to max out separation. It would adjust the subcarrier delay before the remix stage. If it's not that, it probably delays the rear channels to make the room sound larger. I suspect it's the former. More than likely, this model is intended to be a reference standard demodulator. Something other demodulators would be compared with. I would hang on to that one, and listen to it.
 

Soundfield

701 Club - QQ All-Star
Joined
Dec 29, 2011
Messages
745
Location
Essex, UK
Wow, I've never seen one with delay controls. I suspect that's to fine tune the delay to max out separation. It would adjust the subcarrier delay before the remix stage. If it's not that, it probably delays the rear channels to make the room sound larger. I suspect it's the former.
I suspect you are correct - the maximum delay offered by that knob is apparently 50uS which represents 1.7 cm so not making the room very much bigger!
 

fredblue

2K Club - QQ Super Nova
QQ Supporter
Joined
Mar 30, 2009
Messages
23,237
Location
London, England
ooh i say! what a tasty looking bit of kit! :love:

I notice it has a blend switch, how "blended" do things get with it engaged?
my little Grundig CD-4 demodulator has a blend switch round the back (wish it looked as impressive as this JVC beauty of yours!!) but I don't use it as it seems to defeat the point of CD-4 (imho!).

also, how do you make the adjustment for the 30khz carrier?
is it on the underside of the unit, like the 4DD-5?
or is it automatic like the Grundig Quadro and Marantz CD-400B?

one thing this does have in common with the diminutive Grundig is, afaik, they both use the "Holy Grail" CD4-392 chip.. how cool is that! :QQlove
 

bigbillquad

1K Club - QQ Shooting Star
QQ Supporter
Joined
Dec 6, 2010
Messages
1,318
Location
New Zealand . Waitakere
ooh i say! what a tasty looking bit of kit! :love:

I notice it has a blend switch, how "blended" do things get with it engaged?
my little Grundig CD-4 demodulator has a blend switch round the back (wish it looked as impressive as this JVC beauty of yours!!) but I don't use it as it seems to defeat the point of CD-4 (imho!).

also, how do you make the adjustment for the 30khz carrier?
is it on the underside of the unit, like the 4DD-5?
or is it automatic like the Grundig Quadro and Marantz CD-400B?

one thing this does have in common with the diminutive Grundig is, afaik, they both use the "Holy Grail" CD4-392 chip.. how cool is that! :QQlove
Hi. fredy

I am dying to get into my CD-4 collection with this baby but dealing with Q8 & Q4 lately I have my system set up with Reel to Reel & my Quad 8track player Its the old story of no room for everything at your fingertips..

Yes its automatic for the 30khz carrier in photo 2 it has... "ready & play lights"... I have not down loaded the manual yet so not fully confers yet with this unit but it was a great find I bought it her in little old NZ would you believe it....

O the blend switch you would only use it with a well worn LP as you say it sacrifices separation for less sand paper nose...
 
Last edited:
Joined
Mar 25, 2014
Messages
297
Location
Massachusetts
JVC demodulators aren't a rebadge of anything. JVC invented CD-4 and all their demodulators are pure JVC. More than likely, the Victor demodulator you speak of is actually a JVC.
Sorry for mis-speaking Quadfather. That's actually what I meant, that they were the same device, just labelled two different models under the JVC/Victor umbrella. I have no idea which of the two brands would have had a given model "first".
I know you're knowledgeable in CD-4 because I've used your forum advice in setting up my CD-4 system: CD-4 was developed by JVC, but started life in Japan (didn't it?), who would you guess might have had an identical offering like the 4DD-10 / CD4-2 or 4DD-5 / CD-30 "first"? Probably varied from offering to offering. I'm not clear on how the business hierarchy was between JVC and Victor.

Frontal controls are nice for easier fine tuning of channel separation. My CD4-10 and UDA-100 both have this - fewer times having to reach around the back of the demodulator to adjust the separation (but nevermind carrier signal adjustment).
 
2
Top