18V power adapter replacement for pro-ject phono box mm

dear members, I have a project phono box mm but sadly the power adapter has ended its life. to make matters worse, the adapter does not have a usual socket (3 holes) and the phono box itself, the input DC has 3 pins sticking out in a circle. called my local dealer but they mentioned that the product has been discontinued so they don't sell the adapter replacement. hope that someone out there will be able to assist me with this. really hope ill be able to source for the adapter. thanks so much -Jason

p.s. the model no of the adapter is sap180050eu
photo links of adapter jack and phono box input dc socket
https://ibb.co/i1O8kR
https://ibb.co/haWps6

 

here are more self uploaded links of more photos of the phono amp and its adapter thanks so much

25520126 10156484834086393 1710668231 n
25520144 10156484833716393 1180539370 n
25529875 10156484835911393 78581347 n
25564544 10156484835441393 1865803012 n
25564819 10156484834621393 1512954691 n
25590008 10156484834421393 303607573 n

 

That must've been an early design that needed +/- 18V, I think the later ones just use +18V, so have the normal two pin concentric connectors like you see on just about everything now. Maybe send email to Pro-Ject and ask for ideas. Or just toss it and buy a new (or used) one

 

do you have their email? I tried to msg them from the web form on their website but no response and it has been more than a month

 

[email protected]

 

I would measure between each of the pins with a multimeter first before considering the power supply to be at fault. You should get either 18V or 36V between pins depending on which connection you test, of +18V/GND/-18V.

You could disassemble the plug on the end of the cord, and see if there is a broken wire or solder connection inside. It is probably held together with a set screw.
An enterprising tech could crack open the plastic case of the power supply and replace capacitors as a possible fix.

Probably your guy:

ND-077: 2 x 18V / 250mA DC Power Supply

• All DC versions of the Phono Box MM, up to Serial Number E4360, excluding those with ND-024 (see below).

Ordering it from the UK, with the link above, you are likely to get one with a UK "G" wall plug (3x rectangular wall pin), which should actually be the standard plug in Singapore, not the European round-pin connector you show.



The connector on the end of the power supply looks to be a Switchcraft CB3FX 3-pin connector - used for CB radio handsets:


The corresponding connector on the box would be the CB3mx:


A +18V/GND/-18V power supply of any type is harder to find. I was only able to discover expensive +15V/GND/-15V with a different connector.

Edit:
Disassembling the cord will likely need some creative paper-clip poking through the back to release the spring latch that holds the metal cover onto the plastic plug body:

 

hi harby will it be possible to connect 2 9v batteries to power up the preamp?

 

Hi.

You would need four. There is +18V, Ground, and -18V.

Between +18V and -18V, that's 36 volts total potential.



Most dual supply op-amps, such as the Pro-Ject's NJM4580 chips, and devices based on them, can operate within a voltage range. You might try such a power supply with the more common lower voltage +15V/-15V, which should only reduce the maximum signal output headroom on the RCA outs.

 

The power supply is somewhat similar to the Project Phono RS which is also +/-18v although the end fitting may be a different size. I think the RS one is also 300ma output rather than the 250 on the op's one.
If the op is waiting on a reply directly to Pro-ject he could be waiting a long time. I'm still hanging out for a question I sent to them in 2006 requarding my then Perspective TT.
A better course might be to contact the UK agent, Henley Audio who appear to be more resposive
Welcome to Henley Audio
or a UK retailer like Analogue Seduction
Search Results

 

It would be, I linked the exact adapter, in post#6, where one can pick ND-077 from the drop-down menu and press "add to cart".

 

Hey, look what I have, the elusive +18v/-18v power supply:



It has a plastic square four-pin power connector for the device that could be switched to something different, but I thought I'd better get it while I had the chance, who knows when it might be useful. Don't know how that would help someone in Singapore though...

 

hi harby, how do I make the connection? I have ordered croco clips and wires from ebay about 2 weeks ago. still waiting for them to show up in the mailbox. anyway, initially, I thought of connecting 2 9v batt together, then from the +ve connect it to the positive of the input pin of the phono box and the negative to the negative of the input pin of the phono box but that wont work right? thank you

 

yup still waiting for them to respond.. hehehe..

 

They don't have a pin description. You could email Pro-Ject and see if they will supply one, otherwise you would have to open the phono box and see if you can find the meaning of the pins from silk-screening or device connections inside.

Funny, I just found another +18v/-18v power supply, from a JBL iPod boombox. It has a s-video style connector.

 

ohhhh..so those 3 pins sticking out don't mean anything.. I see.. thought they meant positive negative and earth or something like that. thank you for the info harby. I guess the battery connection is out then..

 

That is what the power supply input pins are for. One pin is the connection for +18 volts, one pin is the connection for Ground (earth), and one is the pin for -18 volts.

You need to discover the correct meaning of the pins. You don't know which pin is for +18V. There is no information provided by Pro-Ject on the internet. You can either contact Pro-ject for the information about how to wire the pins (using the 3-pin connector I linked above), or you (or a technician) can open the Pro-ject box and see if there is more information inside.

 

thanks harby