Patch cords

[The Bushmaster]

I have a new(to me) Dual CS 721 arriving tomorrow that someone removed the original patch cord and replaced it with a standard RCA patch cord. In as much as CD-4 patch cords are hard to find I will have to manufacture a new one. What is the microfarad requirement for about 4 feet of patch cord from the turntable and the demodulator? Or the uF per foot or yard.

Thanks.

 

[The Bushmaster]

Now where did all of the experts go? They were here a short while ago. I'll be damned! Absolutely quiet.

 

[JonUrban]

I wish I could help but I don't remember or just never knew.

Someone here should know, maybe winopener or quadtrade? "Quad First" is a CD-4 expert but he only stops by once in a while. You could try PM'ing him.

 

[quadsearcher]

The lowest I"ve found is a Belden video cable, thin, easy to work with, haven't tried it yet, about 19 pF/ft.. Belden lists pF/ft for each wire number on their site.

 

[quadsearcher]

1281 is the cable number, 17pF/ft.

 

[The Bushmaster]

Thanks Jon. I appreciate you prodding the experts out of the hinter land.

Picofarads (instead of microfarads) O K...That helps. Thanks.

 

[quadtrade]

This was not really an issue by the 80s, we had thick cords that work fine. This was an issue back when cd-4 started, if you are old like me, ya remember all cables were thin pieces of crap back in the early 70s. Grab a good thick cable and soldier correct and it will work fine.

 

[Doug G.]

Turntable and cables - 100pF max. (although up to 125pF will still work).

Thickness is not really an indicator. I have seen thin cables with very low capacitance and thick with high capacitance. It's all in the design. You have to go by specs or measure them.

Doug

 

[EMB]

Thanks Jon. I appreciate you prodding the experts out of the hinter land.

The French call it Noblesse Oblige.

That, and the fact that he's just a nice guy who happens to own and run the board. He cares. Like me, he's a music lover, not a tech guy (wish I had been, though, the repairs woulda been a lot easier to do and a LOT less expensive).

ED

 

[ar surround]

I have a new(to me) Dual CS 721 arriving tomorrow that someone removed the original patch cord and replaced it with a standard RCA patch cord. In as much as CD-4 patch cords are hard to find I will have to manufacture a new one. What is the microfarad requirement for about 4 feet of patch cord from the turntable and the demodulator? Or the uF per foot or yard.

Thanks.

Bushmaster - If you really must have an OEM CD-4 cable, send me a PM and I can send you the one that came with my old Panasonic CD-4 demodulator. You can have it for the cost of shipping - consider it my QQ community service project for the year. Do you realize that this cable is only about 25" long?

 

[The Bushmaster]

PM Sent.

 

[quadtrade]

Hogwash. I have never found a cable that does not work when i used my Harmon Kardon t60 which has rca outputs on the turntable for cables. Any monster cable will work fine.

Turntable and cables - 100pF max. (although up to 125pF will still work).

Thickness is not really an indicator. I have seen thin cables with very low capacitance and thick with high capacitance. It's all in the design. You have to go by specs or measure them.

Doug

 

[The Bushmaster]

ar surround...Recieved it yesterday. As my turntable is rather close to the demodulator it was a perfect fit.

Postage on the way.

Thanks Mike

 

[Doug G.]

Hogwash. I have never found a cable that does not work when i used my Harmon Kardon t60 which has rca outputs on the turntable for cables. Any monster cable will work fine.

You can ignore the CD-4 specifications all you want. It doesn't make you correct.

You're just being belligerent because I don't agree with your leftist politics.

Doug

 

[EMB]

Be nice, kids, or the scissors come out....

ED