CD-4 Turntable?

[edisonbaggins]

I'm not the seller. Just curious!
No stylus. "3 of 4 channels working.
I thought CD-4 could work with a regular TT?
https://www.facebook.com/marketplace/item/492280132518336/

 

[kfbkfb]

https://worldradiohistory.com/Archi...0s/1973/Radio-Electronics-1973-10.pdf#page=31^^^
Setting up for CD-4 records


The tonearm needs low capacitance wiring (turntable makers rarely mention this now) to work for CD-4, JVC and Panasonic made turntables w/built in CD-4 demodulators.

(the manual for my Akai turntable [purchased in 1982-06] does say the tonearm wiring is suitable for CD-4)


Kirk Bayne

 

[Soundfield]

I'm not the seller. Just curious!
No stylus. "3 of 4 channels working.
I thought CD-4 could work with a regular TT?
https://www.facebook.com/marketplace/item/492280132518336/

It's a turntable with a built in CD4 demodulator.

 

[furui_suterioo]

My Victor JL-B41 says "4 channel" on the lid I suppose due to the low cap wiring and options for shibata stylus when it was new but is essentially a regular tt.

 

[par4ken]

CD-4 turntables as I recall used low capacitance wiring inside the tonearm as well! They had anti-skate settings for shibata as well as elliptical and conical stylus. Some like the one pictured had a built in CD-4 demodulator. I haven't seen any for sale in awhile, but then again I haven't been looking.

 

[Doug G.]

The only real difference between a regular TT and a CD-4 TT is the low capacitance wiring. The "specific" anti-skate setting was more a marketing gimmick than anything else because you have to adjust the anti-skate to work instead of just setting it to a fixed adjustment.

But yes, the subject TT has a built-in demodulator, which would be a Panasonic or Technics and outputs to go to line inputs on amps/receivers.

The actual TT plopped on top there is just a regular BSR with, probably, low capacitance wiring to the internal demodulator.

Doug

 

[soesbeout]

My Pioneer PL-55DX was sold as a made for quad TT also.

 

[winopener]

I'm not the seller. Just curious!
No stylus. "3 of 4 channels working.
I thought CD-4 could work with a regular TT?
https://www.facebook.com/marketplace/item/492280132518336/

It has inside a SH400 cd4 demod. The record changer isn't great.
The cartridge is valuable.

 

[edisonbaggins]

It has inside a SH400 cd4 demod. The record changer isn't great.
The cartridge is valuable.

This one looks to me like it's missing the cart. I could be wrong. Is a built in demod any good?

 

[kfbkfb]

https://www.lpgear.com/product/TSTSL0701.html
At least a replacement stylus is still available, IMHO, the Technics SH-400 demod is one of the best (uses the CD-4 IC).


Kirk Bayne

 

[edisonbaggins]

https://www.lpgear.com/product/TSTSL0701.html
At least a replacement stylus is still available, IMHO, the Technics SH-400 demod is one of the best (uses the CD-4 IC).


Kirk Bayne

How big a concern is it that 3 of 4 channels are working?
Thinking about picking this thing up, pending some market research.

 

[kfbkfb]

Could mean it isn't repairable if the circuitry is damaged or it may just need some internal connectors cleaned and/or retightened.

(for ~$63, it might be worth it to buy it just see what can be done, since it's a complete system, all of the CD-4 alignments are already correct)


Kirk Bayne

 

[Electric Moo]

Agree, if it's that cheap I'd buy it & try to repair it

 

[edisonbaggins]

I've inquired.

 

[Soundfield]

How big a concern is it that 3 of 4 channels are working?

If you're not good at fault finding and repairing vintage electronic equipment I'd suggest you don't touch it with a barge pole!

 

[Doug G.]

The SH-400 demodulator is very good. Of course, you don't get the beauty of the stand alone unit.

It uses Lou Dorren's chips and if one of them were to be the cause of the missing channel, finding a replacement might be a real bearcat. However, to me, it's unlikely that is the cause- for just one channel to be missing on account of one of those chips.

It's inexpensive enough but it does depend on your skills as a troubleshooter. Of course, it may be a very simple problem.

Myself, I would rather have stand alone components (which I do have).

Doug

 

[MrMike86]

https://worldradiohistory.com/Archi...0s/1973/Radio-Electronics-1973-10.pdf#page=31^^^
Setting up for CD-4 records


The tonearm needs low capacitance wiring (turntable makers rarely mention this now) to work for CD-4, JVC and Panasonic made turntables w/built in CD-4 demodulators.

(the manual for my Akai turntable [purchased in 1982-06] does say the tonearm wiring is suitable for CD-4)


Kirk Bayne

I have two turntables, a Marantz 6300 and a Thorens TD165. Are either of these capable of workin with a CD4 Demodulator and quad cartridge? Are either wired with low capacitance wires?

 

[kfbkfb]

I don't know, IIRC, CD-4 needs no more than 100pF (from the phono cartridge to the CD-4 demodulator input).

Amazon sells capacitance meters [one was ~$26] (I haven't used one), new phono cables from the turntable to the demodulator can be used to reduce the total capacitance, but I've never heard of putting new wires inside the tonearm.


Kirk Bayne