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VERY IMPORTANT. These links take you to the product, however Amazon have three different ways of selling. There's Amazon Direct - This means that you are only dealing with Amazon themselves, then there's other sellers that use Amazon's facilities - these show as Fulfilled By Amazon and finally there's Market Place sellers that advertise on Amazon, but operate independently.  I strongly recommend that you only use the first...the Amazon Direct - Sold By Amazon option. Even if it appears that you are paying a couple of £/$ more it is more than likely you are comparing the price of a real item against the price of a fake.

To give you an idea of the extent of the fake goods problem. In a 2016 survey by Apple - 90% of the 'Apple' chargers sold through Amazon - using the other the two methods..which includes the "Fulfilled by Amazon" option -  were found to be counterfeit....90%! 

 
« Time for a quick nixie tube video | Main | Review: Feiyu Tech Wearable Gimbal »
Wednesday
Oct182017

CX Discs - Better, Worse & The Same as a normal record

CBS envisioned all records made after 1982 utilising their CX encoding system, but if you've bought any music on vinyl since the mid 80s, you won't see a CX logo on the sleeve...so what was CX and what went wrong. Watch this video to find out. 
   
    
As always there are some great contributions in the comments - especially this link to a DIY CX decoder kit.

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Reader Comments (16)

Great video! CX! ;) I completely forgot about it, except for analog sound on early Laserdiscs!
(Which used a modified version of CX)

Found this:
http://www.proaudiodesignforum.com/forum/php/viewtopic.php?f=12&t=739

A DIY CX encoder!
Here's the complete issue:
http://www.americanradiohistory.com/Archive-Poptronics/80s/1982/Poptronics-1982-01.pdf

So it sems your RS120CX have the 3-chip CX solution as you pointed out in the video. eg. 3 op-amps IC's, one (the 13700D ) a bit unusual... TL084 is industry standard op-amps.
Would be fun to see which CX design board they put into the direct drive RS220CX!

Also, the CX line output of the Telefunken players needs to adjusted if a new pickup or different brand is fitted, normally the Audio-Technia AT-72K was factory fitted. This is according to the manual and a german Forum I've found.

October 19, 2017 | Unregistered Commenterpinswede

Great video as always!
Ok, this doesn't have anything to do with it, but after watching it, I've thinked about TECHMOAN!

https://www.youtube.com/watch?v=jWUqrn2yKns

The console of the car! Am I the only one who thinks it's... beautiful!
:D

have a great day everybody!

C.

October 19, 2017 | Unregistered CommenterClaudio

CBS patent for CX system:
https://www.google.com/patents/US4376916?hl=sv

More nice info, albeit in German:
http://www.hifi-forum.de/viewthread-26-8655-4.html

October 19, 2017 | Unregistered Commenterpinswede

Thanks for that amazingly in-depth video! Sorry if I sent you down the rabbit-hole (or is that pot hole?) with the suggestion. You covered more than I could ever imagine.

And I'm so glad for having lived on both sides of the pond to really 'get' both sides of your muppets' jokes. Brilliant!

October 19, 2017 | Unregistered CommenterDahFinstah

Oh, forgot to mention: the short clips you pulled from the Telefunken (CX) record player were out-of-phase.

October 19, 2017 | Unregistered CommenterDahFinstah

Hi Matt,
I must confess I am impressed by the amount of time and research you put into these videos. I worked in the Hi Fi Trade for many years and never came across this one. I never knew of it's existence.

Perhaps it was because I sold hi end equipment that I missed it and perhaps the reps didn't want to push their luck.

When you think of the technology of today you could probably introduce something similar today but I don't think the purists would accept it.
Thank you for your time and effort. I really enjoyed this one.
PS I suspect the motor in the belt drive turntable was of the frequently generator type and that was were the bad speed issue was.

Jeremy Travis.

October 20, 2017 | Unregistered CommenterJeremy

Hi, Mat. Once again you have made an interesting, informative and entertaining video on a technology that I have never heard of, and I used to think I was well up on these things! I immediately checked all the many CBS albums in my collection - not a single CX amongst them!
Quadrophonic next? - another abortive technology that Sony and Columbia (and others) tried in the 1970’s.....

October 20, 2017 | Unregistered CommenterRoland

Thanks for all the comments and info - I've added the link to the DIY kit into the post as well.

October 20, 2017 | Registered CommenterTechmoan

I searched your site for Quadrophonics with just this comment being found. Is there any Quadrophonic equipment about I wonder? In the 70's I visited Decca's studios in London and saw them testing Quadrophonic remixes (someone and his two pianos I think?). Sometime later I also managed to get a copy of Simon & Garf's Bridge Over Troubled Water in a quadrophonic format (I still have it somewhere!) never managed to play it on any Quadrophonic kit, but it was compatible with stereo cartridge & turntable and was very high audio quality. I'd be interested to know if you've ever seen any equipment around?

October 21, 2017 | Unregistered CommenterSteve Wootton

Want albums to sound better, do what i did back in the early 80's, get a dbx compressor/dynamic range expander.. Heck of a difference and you get to play engineer

October 22, 2017 | Unregistered Commentertj treinen

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