Dual Service

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kceretzke
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Re: Servicing Dual Turntables - Revised

Post by kceretzke » 15 Apr 2018 00:02

I have a Dual 1004 turntable that is in great condition but I believe it has a cycling problem. Can anyone help trouble shoot a Dual 1004? Thank you

dualcan
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Re: Servicing Dual Turntables - Revised

Post by dualcan » 15 Apr 2018 04:32

Hi,
I have uploaded both the 1004 and the 1004S service literature to the Library section above. The 1004S was the first Stereo wired Dual changer derived from the mono 1004.
Regards,
k

joea
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Re: Dual Service

Post by joea » 06 Jan 2019 01:19

I am just now building the DIY turntable stand, using the instruction manual provided here.

Thanks for the instructions, the stand should prove useful, even for an amateur "turntable tech" such as myself.

Before I assemble the base, there is one thing I do not understand.

The long measurement of the base and back brace is specified as 18 inches, while the interior dimension distance between the arms is specified as 16 inches.

Since the plywood is 3/4 inch thick, this requires the arms to be "inset" from the edge of the base.

Preferring the sides to be "flush" I was just going to trim the pieces to 17 1/2 inches but thought I might ask if there is some reason I should not.

joea
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Re: Dual Service

Post by joea » 06 Jan 2019 02:58

joea wrote:
06 Jan 2019 01:19
I am just now building the DIY turntable stand, using the instruction manual provided here.

Thanks for the instructions, the stand should prove useful, even for an amateur "turntable tech" such as myself.

Before I assemble the base, there is one thing I do not understand.

The long measurement of the base and back brace is specified as 18 inches, while the interior dimension distance between the arms is specified as 16 inches.

Since the plywood is 3/4 inch thick, this requires the arms to be "inset" from the edge of the base.

Preferring the sides to be "flush" I was just going to trim the pieces to 17 1/2 inches but thought I might ask if there is some reason I should not.
I should add that the pictures show the arms flush with the edges of the base, adding to my hesitation.

Hugues TR4
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Re: Dual Service

Post by Hugues TR4 » 06 Jan 2019 11:19

Hi joea,

I also made this very handy turntable stand, following blindly (well...almost…) the instructions given and it corresponds exactly to the specified measurements needed for both large and small chassis Dual's, with the appropriate spacers.
The sides are not flush on mine but the distance between the two sides is exactly 40.5mm (16") as specified. That is the paramount importance.
Enjoy your puzzle!
Cheers,

Hugh.

Ad-vice2011
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Re: Dual Service

Post by Ad-vice2011 » 07 Jan 2019 23:02

Question: I have a Dual model 1249, x2. After major restorations, I connected both of them to two different amps from the 70's. With new cartridges installed. The best sound i could get from the speakers trying both 1249 units and two different amps was a tinny sound from the record. It sounds like an old transistor radio with a bad speaker.

The only thing i can think of, these cartridges are dual magnet, would these older amps (which are also radio, 8 track, etc) only good with a ceramic cartridge?

Thank you for you help. Mike

joea
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Re: Dual Service

Post by joea » 07 Jan 2019 23:32

Hugues TR4 wrote:
06 Jan 2019 11:19
Hi joea,

I also made this very handy turntable stand, following blindly (well...almost…) the instructions given and it corresponds exactly to the specified measurements needed for both large and small chassis Dual's, with the appropriate spacers.
The sides are not flush on mine but the distance between the two sides is exactly 40.5mm (16") as specified. That is the paramount importance.
Enjoy your puzzle!
Cheers,

Hugh.
I went ahead and trimmed the bottom and rear piece to 17 1/2 inches. Lined up perfectly. Laid on a couple coats of Minwax Urethane just to avoid future splinters and staining from any lubricants or dirt that may drop from time to time.

Still gathering up odds and ends to finish it.

tep392
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Re: Dual Service

Post by tep392 » 10 Jan 2019 14:51

I've noticed the tracking force scale on my 1219 reads about 0.25g lower than measured with a digital scale. I thought they were supposed to be more accurate. What should I look at first?

Hugues TR4
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Re: Dual Service

Post by Hugues TR4 » 10 Jan 2019 15:08

@ tep392: is your scale wheel real tight in its lodge? Sometimes it gets slightly loose, or the spring is detached from its locking point.
There could always be a small difference in the reading: do not forget it works with an almost forty years old little spring…
For real accuracy, I use my digital scale.
Enjoy your music!

Hugh.

Hugues TR4
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Re: Dual Service

Post by Hugues TR4 » 10 Jan 2019 15:21

@ Mike (Ad-vice2011): you definitely need a "phono mag" entry to reproduce the sound from a magnetic cartridge.
Your old amps are probably made for ceramic cart.
Just tried to play my 1219 with a Shure M44 MM through a ceramic entry and it sounds tinny indeed.
You would need a more recent amp or the appropriate pre-amp.
Hope this helps,

Cheers,

Hugh.

Spinner45
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Re: Dual Service

Post by Spinner45 » 10 Jan 2019 17:06

tep392 wrote:
10 Jan 2019 14:51
I've noticed the tracking force scale on my 1219 reads about 0.25g lower than measured with a digital scale. I thought they were supposed to be more accurate. What should I look at first?
That's amazing, really.
Considering Dual originally advertised their turntable's stylus pressure dial at about the same accuracy in the 1970's.

tep392
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Re: Dual Service

Post by tep392 » 10 Jan 2019 17:47

Spinner45 wrote:
10 Jan 2019 17:06
tep392 wrote:
10 Jan 2019 14:51
I've noticed the tracking force scale on my 1219 reads about 0.25g lower than measured with a digital scale. I thought they were supposed to be more accurate. What should I look at first?
That's amazing, really.
Considering Dual originally advertised their turntable's stylus pressure dial at about the same accuracy in the 1970's.
I haven't seen the advertised specs. Just some of the magazine reviews posted here that tested better. If that's within factory specs, then I won't mess with trying to calibrate it. Looks like I would need to disassemble the gimble, and I don't really want to mess with the bearings, which are adjusted and working very well. I'll just remember to subtract 0.25 from the desired setting and I always verify with the scale anyways.

Ad-vice2011
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Re: Dual Service

Post by Ad-vice2011 » 15 Jan 2019 22:24

Hugues TR4 wrote:
10 Jan 2019 15:21
@ Mike (Ad-vice2011): you definitely need a "phono mag" entry to reproduce the sound from a magnetic cartridge.
Your old amps are probably made for ceramic cart.
Just tried to play my 1219 with a Shure M44 MM through a ceramic entry and it sounds tinny indeed.
You would need a more recent amp or the appropriate pre-amp.
Hope this helps,

Cheers,

Hugh.
Thank you

tep392
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Re: Dual Service

Post by tep392 » 21 Jan 2019 20:44

I have a question that should be easy for the seasoned vets here. I just finished cleaning and lubing my 1219. Replaced pimple and single/multi ring. I have a slight problem when I start a record. The arm moves smoothly to the correct position over the lead-in then stops a moment before it lowers. At the moment just before lowering, the arm moves outward a couple mm's. Sometime enough to just miss the edge of the record. What should I be looking at to fix this? If I raise and lower it using the cue lever, it doesn't move right or left, just up and down.

Spinner45
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Re: Dual Service

Post by Spinner45 » 22 Jan 2019 02:26

There are several critical adjustments involved in the "end of cycle" mechanism.
If you've removed any parts in your cleaning, these adjustments will likely require re-adjustment again.
The Service Manual covers all these things.
The cuing height and limits - the main cam follower lever adjustment - etc.
The "paddle" underneath must be free from the pimple before it moves horizontally, because if it moves while touching the pimple it will upset the arm's downward motion.

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