Library / Dual

Dual CS 505

2-Speed Automatic Belt-drive turntable with pitch control

Dual CS 505

Description

Floor vibration and acoustic feedback are frequent external sources of interference.

Vibrations can be transmitted to the record player with each step, and sound energy from the loudspeakers can be fed back acoustically to the record player through the air or through a piece of furniture.

To minimise these unwanted effects, the Dual CS 505 uses a floating chassis.

In the Dual 505, a great deal of technical expertise has been applied to acoustically decouple the entire turntable drive unit from the remainder of the casing.

As a result, external interference is filtered out so effectively that it no longer has any audible effect on the music.

The anti-resonance mat used on the CS 505 filters and counteracts resonances which can be transmitted through the record player to the record.

Specifications

Drive: Dual 16-pole SM 100-1 synchronous motor with precision flat belt for flywheel drive

Starting time: 2 to 2.5s

Platter: 304mm, 0.9kg, non-magnetic, removable

Speeds: 33.33 and 45rpm

Pitch control: 6%

Wow and flutter: 0.05% WRMS

Rumble: 69dB

Tonearm: distortion free ultra low mass aluminium tubular tonearm in 4 point tip bearing

Review

An impressive, easy to use and fuss free turntable system with a number of useful facilities - £80 HiFi Choice 1983

Slightly lacking in balls, but compensates with a consistently unmuddled presentation and good stereo focus perspectives - £170 (CS-505-4) HiFI Choice 1992

Downloads faq

-2 flyer (en)

-2 instruction/owners manual (en)

-4 flyer (en)

-1 instruction/owners manual (en, de, fr, nl, es, se, ita)

-1 service manual (en, de, fr)

-2 instruction/owners manual (de)

-2 flyer (de)

-2 service manual (de)

-3 instruction/owners manual (de)

-4 service manual (de)


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Dual CS 505 / CS505 owners manual, service manuals and schematics are for reference only and the Vinyl Engine bears no responsibility for errors or other inaccuracies. The PDF files are copyright the Vinyl Engine and provided under strict licence. Reproduction for financial gain is strictly prohibited. This website is not affiliated with or sponsored by Dual.

Comments

Great sounding

Submitted on August 24th, 2009 by westcoast92126

Turns out the previous owner was using a rubber band as a belt... (?!?)
I purchased new belts (one for pitch control also) and a new cartridge for it.

Everything works great. All features fully functional. Speed at 33/45 seem consistent when monitoring between LPs & CDs (I don't have a strobelight). The only thing I'm thinking about now is what kind of lubing it is in need of. I might have to take it to a vintage service shop for that.

My RCA plugs are a bit worn, but, removing the chassis from the plinth I see the junction
where the cartridge wires meet the RCA cord wires at 4 terminals. I might replace the entire RCA cable side with higher quality... some day. For now, I just want to keep spinning vinyl since they sound so nice.

Dual CS505-2 Plays too fast and also speed is warbly

Submitted on June 19th, 2009 by westcoast92126

Hello. I purchased the turntable from a local thrift store because it looked in very nice shape physically. Upon hooking it up at home, I noticed the speeds at 33/45 are both too fast and warbly and the pitch knob doesn't appear to do anything. I managed to remove the unit from the wood base and looked underneath. Everything looks in very nice condition, but, I don't see the toothed belt. Since I did try a record on it, I assume the flat belt is attached (I didn't remove the platter yet).

I was wondering is the speed being fast and warbly usually mean the motor needs replacing, or, could a missing toothed belt cause this speed problem?

The unit does turn off and lift tonearm at end of record.

Any feedback would be greatly appreciated! Thank you.

toothed belt

Submitted on June 19th, 2009 by JaS

Hi,
It's common for the toothed belt to disintegrate over time and while you can try to set speed with the unit apart it's best to replace it. The 'warbly' sound could be the main belt slipping, but cleaning it and the drive surfaces may fix it?

Regards,
JaS

how to replace the toothed belt on the 505-2?

Submitted on August 26th, 2009 by rw280

I am very happy to have found this forum. My 505-2 had been in storage for the last 15 years. I now like to bring it out of its hibernation. I was able to use the advice from this forum to get the microswitch to work. But I haven't been able to figure out how to install a new toothed belt. Please help.

Many thanks,

RW

Dual cs 505-2 problem

Submitted on June 13th, 2009 by hirstfam

Hello. I've got a new amp (NAIT) but it doesn't have a 'ground' screw on it. What should I do with the black earth wire from the turntable? I'm getting quite a bad buzz at the moment.

amp with no ground screw

Submitted on June 27th, 2009 by josephazannieri

Yo hirstfam:

All you need to do is take that ground wire from the turntable and tie it under any screw on the chassis of the amp. You just make contact with any bare spot. Most amps have a metal bottom that is bare metal that is held in place by screws along the edge of the chassis. Any of thse screws will work. Just back it out, stick the spade lug under it and tighten it. Any contact with amp chassis will take care of the problem.

Joe Z.

Dual CS 505 problem

Submitted on December 31st, 2008 by fnikolajeff

I have a Dual CS 505-2 from mid-80s. It has been spinning like a cat ever since, but recently when I plugged in the electrical cord it wouldn't start, so that when I raise the tonearm the platter doesn't turn. Does anyone know if there is a fuse or something rather simple that I could fix myself?

Thanks,
Fred

try oiling the motor or just

Submitted on August 20th, 2009 by AVchallaged13

try oiling the motor or just removing the turntable from the base and seeing if the micro swich that turns the table on is jammed, there are no fuses in the turntable

Cs 515 problem

Submitted on February 28th, 2009 by Melvin

My father used to repair appliances. I remember that on motor (in that case you have a 16 poles motor) a pole might not work. And I think that if it is the case if you turn the motor like 1/8 of a turn it might start. But then I imagine that you already tried to turn the turntable a bit so that with the belt in place the motor must have turn a bit and would have start. You might find one used for a cheap price (I did for 40$).

Good luck

Dual CS 505 problem

Submitted on January 9th, 2009 by rodsmith

I've just had exactly the same problem myself & tried to see what was wrong. I managed to get the floating part of the chassis off the base but could see nothing obviously wrong. I suspect the belt might be broken or loose but can't see where the belt is located. I've bought another used Dual for now.

Common problem on Dual 505-2

Submitted on April 3rd, 2009 by vekelly

Saw your query from January.

Underneath the chassis there is a leaf switch with a cover over it near the spindle. It looks like a little tan pushbutton if I remember correctly on my unit, but your color may be different. An actuator presses on it when the tone arm is raised and moves toward playing position. It is *very* common on these units for the action of the pushbutton to get stiff if the unit is idle for a long time, and if so, it will not flip on the motor power. Solution is to press the button a few times. It may "pop" the first time, then should begin to work smoother. After about 5 presses, the unit is back to normal.

Easiest prevention is to play records more often.

Cheers.

re: Common problem on Dual 505-2

Submitted on July 6th, 2009 by pacebrinkley

I am having this same problem. My 505-2 was in storage while I was out of town (for years).

When you write "underneath the chassis" that means underneath the platter?

I cannot find the button mentioned. If I take a picture of the exposed under-platter area, can someone point it out? I have tried pushing whatever seems like a button, or seems to move... to no avail! !

Help! I have lots of great records to spin!

Pace B.

Common Dual 505 problem

Submitted on August 3rd, 2009 by flim

You take off the section that moves when you press on it. The plate that has the disc, arm and all the controls on it. It is supported by springs on the corners. By unscrewing the two screws (1 at the front, 1 on the right) and fiddling with them you can lift up the plate.

I have one taken apart right now, so here are the pictures (I removed the cables and some other lids and stuff, but you get the idea). This is the bottom side of the whole plate:
http://www.flickr.com/photos/fl1m/3785019653/

And the little red thing is the on/off switch for the engine. Press the little plastic thing that sticks out of it a few times and it should be ok again! (You may need to remove a plastic cover first, but that's just one screw...you can't go wrong!) See this:
http://www.flickr.com/photos/fl1m/3785829040/

how to get the floating part off to lift up the plate??!

Submitted on August 19th, 2009 by rossnroller

Hi flim,

I suspect I have the same switch problem, but I can't even work out how to lift up the plate to access the switch!

When you say "By unscrewing the two screws (1 at the front, 1 on the right) and fiddling with them you can lift up the plate", could you please be a bit more specific about what you mean by "fiddling with them?"

Just to make sure I am trying to undo the correct screws, you're referring to the two screws that are used to secure the floating part (ie: stop it "floating") during transport - am I right in this? If so, all I need to find out is HOW these little buggers come off so I can lift up the plate.

Cheers
Ross

Worked it out thanks to a pic kindly posted on the main forum:
Vinyl Engine

Fixed the switch as directed above. Everything working great again! Great thread guys - thanks!

Thanks a lot "flim". This

Submitted on August 8th, 2009 by SteveGrasberg

Thanks a lot "flim". This was a great help for me as well. now my Dual is running again. But i also found out that the tooth belt for speed was broken. I need an new one but where can I find it?

Pitch Belt

Submitted on September 12th, 2009 by signalsuk

Hello Steve.

In the US try Turntable Basics in the UK us signalsuk.com

Regards John

schematic

Submitted on December 29th, 2008 by northender

Thank you!

Download

Submitted on October 23rd, 2008 by christian8

Many thanks!

dual 505

Submitted on December 23rd, 2008 by alex1966

Very helpful manual. I must thank christian8.