Just acquired a Dual CS505-1 turntable made in Germany that was sold in
Canada.

It is wired for a 115v 60Hz supply.

How can I adjust the wiring inside the plinth for 230v operation in the UK?

There is a small circuit board inside the plinth with 5 pins for external
connections. The Dual SM100 motor has 2 identical windings. I suspect it
is a 16 pole synchronous design.

Will I need a different spindle for 50Hz operation?

I have traced the existing wiring, but would rather not guess how to change
it.

Nick

--
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No trees were harmed in the generation of this posting
Just a few electrons may have been disturbed
************************************************** *************************

"Nick" wrote in message
reenews.net...
Just acquired a Dual CS505-1 turntable made in Germany that was sold in
Canada.

It is wired for a 115v 60Hz supply.

How can I adjust the wiring inside the plinth for 230v operation in the
UK?

There is a small circuit board inside the plinth with 5 pins for external
connections. The Dual SM100 motor has 2 identical windings. I suspect it
is a 16 pole synchronous design.

Will I need a different spindle for 50Hz operation?

I have traced the existing wiring, but would rather not guess how to
change it.

Nick

--
************************************************** *************************
No trees were harmed in the generation of this posting
Just a few electrons may have been disturbed
************************************************** *************************



If it's a DC servo motor, you won't need a different pulley. The main power
transformer may or may not have facility to run directly on 230V. The AC
input should be fairly basic - there could just be two wires that go
directly to the transformer, with the power switch being on the DC side. A
stepup transformer for a low-consumption item like a turntable should not be
too expensive, if one is required.

Mark Z.

"Mark D. Zacharias" wrote in message
. com...

If it's a DC servo motor, you won't need a different pulley. The main
power transformer may or may not have facility to run directly on 230V.
The AC input should be fairly basic - there could just be two wires that
go directly to the transformer, with the power switch being on the DC
side. A stepup transformer for a low-consumption item like a turntable
should not be too expensive, if one is required.

Mark Z.

The Dual CS505 uses an AC synchronous motor, so from what you said I need a
bigger spindle/pulley to compensate for the lower frequency.

Since the deck was made in Germany I'd be surprised if there isn't a way of
connecting the two motor windings to the pcb for 230v operation.

Nick

Nick wrote:

The Dual CS505 uses an AC synchronous motor, so from what you said I need a
bigger spindle/pulley to compensate for the lower frequency.

Since the deck was made in Germany I'd be surprised if there isn't a way of
connecting the two motor windings to the pcb for 230v operation.

Nick

The simplest way to convert to 230 operation is to fit a series
capacitor to act as a dropper. To calculate its value you need to find
the motors current consumption (on the ratings plate) and dc
resistance.

To convert from 60Hz to 50Hz you either need a bigger pulley, which may
be sitting there under the TT, or else to use the sellotape trick.
Despite being a horrible bodge it actually works well. The idea is to
wind tape round the pulley to bring its size up as needed. The tape
must be cut to the correct width before winding it on, and it must be
wound in the direction that results in the outer end being pressed back
into place every revolution. I used this trick when younger and it does
work properly. Although it may sound unattractive, its either that or
run round trying to get a suitable pulley, which I doubt you'll ever
find.


NT

Nick wrote:
Just acquired a Dual CS505-1 turntable made in Germany that was sold in
Canada.

It is wired for a 115v 60Hz supply.

How can I adjust the wiring inside the plinth for 230v operation in the UK?

There is a small circuit board inside the plinth with 5 pins for external
connections. The Dual SM100 motor has 2 identical windings. I suspect it
is a 16 pole synchronous design.

Will I need a different spindle for 50Hz operation?

I have traced the existing wiring, but would rather not guess how to change
it.

Nick

Nick,

I have a manual for a Dual 521 which is a similar vintage turntable BUT
NOT IDENTICAL so please be aware that my info might not be correct for
your turntable!!!!

In the 521, the motor is easily rewired for 220-240V operation. there
is a 'box' that the motor leads go to, as well as the mains leads. The
mains leads got to pins 1 and 4, and remain that way. Dual usually uses
brass connectors that go on pins, and can be slid off to change.

For 110-125V: Green and Black go to pin 4, Orange and White got to pin
2, pin 3 is not used, and the neon lamp for the strobe goes from pin 2
to pin 4

For 220-240V: Green goes to pin 4, Orange and Black go to pin 3, White
goes to pin 2. the lamp leads goes from Pin 4 to Pin 3. (The lamp is
across ONE of the motor windings, so it sees about half the line voltage.)

A NEW MOTOR PULLEY IS CALLED FOR! In the 521, the 60 Hz pulley is part
number 234 454, and the 50Hz pulley is 234 253. This part will have to
come from Dual, or a scrap turntable. While you are ordering parts from
Dual, I'd also replace the drive belt, and the cogged speed belt, if the
505 has one.

Again, please remember that my info is for a different model than yours.

Regards,
Tim Schwartz
Bristol Electronics

Nick wrote:
Just acquired a Dual CS505-1 turntable made in Germany that was sold in
Canada.

It is wired for a 115v 60Hz supply.

How can I adjust the wiring inside the plinth for 230v operation in the UK?

There is a small circuit board inside the plinth with 5 pins for external
connections. The Dual SM100 motor has 2 identical windings. I suspect it
is a 16 pole synchronous design.

Will I need a different spindle for 50Hz operation?

I have traced the existing wiring, but would rather not guess how to change
it.

Nick

--
************************************************** *************************
No trees were harmed in the generation of this posting
Just a few electrons may have been disturbed
************************************************** *************************

I posted a reply to this message yesterday but it did not show up on
the group. I think I hit the "reply to author" button instead of the
"reply" button. I didn't keep a copy of the message so I'll try and
redo it for the benefit of the rest of the group.

I have the service manual for this turntable. The wiring for 115V
should be as follows:

Pin 1 = No connection
Pin 2 = White wire from motor plus one end of strobe wire.
Pin 3 = Yellow wire from motor.
Pin 4 = Green wire plus one end of capacitor which is in series with
strobe lamp, plus one end of AC input, and another wire whose color is
not labeled that comes from the motor. Please label this wire as "wire
#4," as I'll be referring to this wire in the conversion process.
Pin 5 = Other side of AC input.

The wiring for 230V should be performed as follows:

Changes to pin 1
1. Move green wire from pin 4 to pin 1.
2. Move one end of strobe wire from pin 2 to pin 1.
3. Move "wire #4," from pin 4 to pin 1.

Changes to pin 2
1. Move one end of capacitor in series with strobe lamp from pin 4 to
pin 2.
2. White wire on pin 2 remains on pin 2.

Pin 3 has no changes. Yellow wire remains as is.

Pins 4 and 5 should now have only the AC input attached.

Make sure you double check all of this before plugging it in. If you
have any questions, please ask.

The 60Hz motor pulley needs to be changed to a 50Hz pulley. The Dual
part number is, 261938.

Good luck.

--
David Farber
David Farber's Service Center
L.A., CA

The simplest way to convert to 230 operation is to fit a series
capacitor to act as a dropper. To calculate its value you need to find
the motors current consumption (on the ratings plate) and dc
resistance.

The pcb has a 5.1k resistor for this purpose.

To convert from 60Hz to 50Hz you either need a bigger pulley, which may
be sitting there under the TT, or else to use the sellotape trick.
Despite being a horrible bodge it actually works well. The idea is to
wind tape round the pulley to bring its size up as needed. The tape
must be cut to the correct width before winding it on, and it must be
wound in the direction that results in the outer end being pressed back
into place every revolution. I used this trick when younger and it does
work properly. Although it may sound unattractive, its either that or
run round trying to get a suitable pulley, which I doubt you'll ever
find.

You are correct! I can't find a source of pulleys.

The pulley is a funny split thing that is forced apart with the pitch
control, but I understand this only does +/- 6% so a silone rubber sleeve
might work!

Thanks for your input NT.

Nick

I have a manual for a Dual 521 which is a similar vintage turntable BUT
NOT IDENTICAL so please be aware that my info might not be correct for
your turntable!!!!

In the 521, the motor is easily rewired for 220-240V operation. there is
a 'box' that the motor leads go to, as well as the mains leads. The mains
leads got to pins 1 and 4, and remain that way. Dual usually uses brass
connectors that go on pins, and can be slid off to change.

For 110-125V: Green and Black go to pin 4, Orange and White got to pin 2,
pin 3 is not used, and the neon lamp for the strobe goes from pin 2 to pin
4

For 220-240V: Green goes to pin 4, Orange and Black go to pin 3, White
goes to pin 2. the lamp leads goes from Pin 4 to Pin 3. (The lamp is
across ONE of the motor windings, so it sees about half the line voltage.)

A NEW MOTOR PULLEY IS CALLED FOR! In the 521, the 60 Hz pulley is part
number 234 454, and the 50Hz pulley is 234 253. This part will have to
come from Dual, or a scrap turntable. While you are ordering parts from
Dual, I'd also replace the drive belt, and the cogged speed belt, if the
505 has one.

Again, please remember that my info is for a different model than yours.

Regards,
Tim Schwartz
Bristol Electronics

Thanks for your input Tim. The CS505-1 is wired differently from the 521.

Sourcing a pulley is a problem, so looking at driving the motor from a power
signal generator instead.

Nick

Nick wrote:
The pulley is a funny split thing that is forced apart with the pitch
control, but I understand this only does +/- 6% so a silone rubber sleeve
might work!

Yes. I remember them. It looks like a teeny-tiny muffler pipe expander.

Nick wrote:

The pulley is a funny split thing that is forced apart with the pitch
control, but I understand this only does +/- 6% so a silone rubber sleeve
might work!

It might, if it happens to be just the right size. You can calculate
the size you need, you want the final outer circumference to be 60/50 x
the present circ.

NT

wrote:
Nick wrote:

The pulley is a funny split thing that is forced apart with the pitch
control, but I understand this only does +/- 6% so a silone rubber sleeve
might work!

It might, if it happens to be just the right size. You can calculate
the size you need, you want the final outer circumference to be 60/50 x
the present circ.

correction, that would give you the wanted running circumference, which
under slight squashage will be a mite smaller than unsquashed
circumference. So you want a circumference of that much plus a mite.


NT

wrote in message
ups.com...
I have the service manual for this turntable. The wiring for 115V
should be as follows:

Pin 1 = No connection
Pin 2 = White wire from motor plus one end of strobe wire.
Pin 3 = Yellow wire from motor.
Pin 4 = Green wire plus one end of capacitor which is in series with
strobe lamp, plus one end of AC input, and another wire whose color is
not labeled that comes from the motor. Please label this wire as "wire
#4," as I'll be referring to this wire in the conversion process.
Pin 5 = Other side of AC input.

The wiring for 230V should be performed as follows:

Changes to pin 1
1. Move green wire from pin 4 to pin 1.
2. Move one end of strobe wire from pin 2 to pin 1.
3. Move "wire #4," from pin 4 to pin 1.

Changes to pin 2
1. Move one end of capacitor in series with strobe lamp from pin 4 to
pin 2.
2. White wire on pin 2 remains on pin 2.

Pin 3 has no changes. Yellow wire remains as is.

Pins 4 and 5 should now have only the AC input attached.

Make sure you double check all of this before plugging it in. If you
have any questions, please ask.

The 60Hz motor pulley needs to be changed to a 50Hz pulley. The Dual
part number is, 261938.

Good luck.

--
David Farber
David Farber's Service Center
L.A., CA

Thank you David. I have traced out the new wiring and it kinda makes sense.

The pulley may be difficult to source, so I'm thinking about making a 110v
60Hz PSU just for the turntable.

Nick

"Nick" wrote in message
reenews.net...

wrote in message
ups.com...
I have the service manual for this turntable. The wiring for 115V
should be as follows:

Pin 1 = No connection
Pin 2 = White wire from motor plus one end of strobe wire.
Pin 3 = Yellow wire from motor.
Pin 4 = Green wire plus one end of capacitor which is in series with
strobe lamp, plus one end of AC input, and another wire whose color is
not labeled that comes from the motor. Please label this wire as "wire
#4," as I'll be referring to this wire in the conversion process.
Pin 5 = Other side of AC input.

The wiring for 230V should be performed as follows:

Changes to pin 1
1. Move green wire from pin 4 to pin 1.
2. Move one end of strobe wire from pin 2 to pin 1.
3. Move "wire #4," from pin 4 to pin 1.

Changes to pin 2
1. Move one end of capacitor in series with strobe lamp from pin 4 to
pin 2.
2. White wire on pin 2 remains on pin 2.

Pin 3 has no changes. Yellow wire remains as is.

Pins 4 and 5 should now have only the AC input attached.

Make sure you double check all of this before plugging it in. If you
have any questions, please ask.

The 60Hz motor pulley needs to be changed to a 50Hz pulley. The Dual
part number is, 261938.

Good luck.

--
David Farber
David Farber's Service Center
L.A., CA

Thank you David. I have traced out the new wiring and it kinda makes
sense.

The pulley may be difficult to source, so I'm thinking about making a 110v
60Hz PSU just for the turntable.

Nick
A 12 volt to 115vac 60hz power inverter might sound like a kludge, but they
are cheap and provide rock solid 60 hz output. Your power requirements are
very low, so a 60 watt unit should do the trick. I bought a new 200 watt
unit for 30 USD. You can run it from a 230v to 12 volt dc power supply, 4
amps should be plenty. Then no modification of the turntable would be
needed.
regards,
tom

"t.hoehler" wrote in message
m...

http://www.velleman.be/Downloads/0/Usermanual_VM113.pdf Nick
A 12 volt to 115vac 60hz power inverter might sound like a kludge, but
they are cheap and provide rock solid 60 hz output. Your power
requirements are very low, so a 60 watt unit should do the trick. I bought
a new 200 watt unit for 30 USD. You can run it from a 230v to 12 volt dc
power supply, 4 amps should be plenty. Then no modification of the
turntable would be needed.
regards,
tom

Tom,

AFAIK sychronous motors do not like to run from the square wave output from
a typical budget inverter.

Have you actually tried to a run a turntable from one of these? If so I
wonder what model it was.

Having got the details for 230v operation I rewired the TT and ran it up
today. It all works but the with it set to 33 1/3 rpm it only runs between
26.5 and 29 rpm depending on the setting of the Pitch control.

So all those folks who said it needs a new pulley are spot on!

I was going to build a Wien bridge oscillator at 60Hz followed by a power
amp and a transormer until I read your post.

Please send me any info you have on using budget inverters for this purpose.

Nick

"Nick" wrote in message
reenews.net...

"t.hoehler" wrote in message
m...

http://www.velleman.be/Downloads/0/Usermanual_VM113.pdf Nick
A 12 volt to 115vac 60hz power inverter might sound like a kludge, but
they are cheap and provide rock solid 60 hz output. Your power
requirements are very low, so a 60 watt unit should do the trick. I
bought a new 200 watt unit for 30 USD. You can run it from a 230v to 12
volt dc power supply, 4 amps should be plenty. Then no modification of
the turntable would be needed.
regards,
tom

Tom,

AFAIK sychronous motors do not like to run from the square wave output
from a typical budget inverter.

Have you actually tried to a run a turntable from one of these? If so I
wonder what model it was.

Having got the details for 230v operation I rewired the TT and ran it up
today. It all works but the with it set to 33 1/3 rpm it only runs
between 26.5 and 29 rpm depending on the setting of the Pitch control.

So all those folks who said it needs a new pulley are spot on!

I was going to build a Wien bridge oscillator at 60Hz followed by a power
amp and a transormer until I read your post.

Please send me any info you have on using budget inverters for this
purpose.

Nick
I haven't run a Dual turntable motor from the inverter, but my Teac 2300S
runs perfectly fine and it has a hysteresis synchronous capstan motor.
regards,
tom

Nick wrote:

Tom,

AFAIK sychronous motors do not like to run from the square wave output from
a typical budget inverter.

Have you actually tried to a run a turntable from one of these? If so I
wonder what model it was.

Having got the details for 230v operation I rewired the TT and ran it up
today. It all works but the with it set to 33 1/3 rpm it only runs between
26.5 and 29 rpm depending on the setting of the Pitch control.

So all those folks who said it needs a new pulley are spot on!

I was going to build a Wien bridge oscillator at 60Hz followed by a power
amp and a transormer until I read your post.

Please send me any info you have on using budget inverters for this purpose.

Nick

Once OP has exhausted all these unlikely efforts, maybe OP will reread
the thread and try the time honoured solutions.


NT

Thanks to all who posted to this thread.

Nick

Nick - did you obtain a new pulley for your CS505? If not, I have a
50Hz CS505 and now live in the US, so I'll gladly swap pulleys with
you, or purchase your old one if you still have it.