Cyrus PSX diy - Advice needed

[pampalini]

Hi,
I just bought a diy PSX, and I would like to know an opinion from you. Is it well constructed? Is it "safe" to connect it to a Cyrus Two?
Here ar some pix of the diy PSX internal:
http://img141.imageshack.us/img141/8504/dsc05788md.jpg
http://img11.imageshack.us/img11/5329/dsc05787h.jpg
http://img827.imageshack.us/img827/8...6194048641.jpg
http://img717.imageshack.us/img717/9533/dsc05784r.jpg
..and here is the Cyrus Two power supply schematic:
cyrus_2_power_supply.pdf

thanks in advance

 

[GloBug]

It looks to be well constructed.
How old is it? You may need to replace the 'lytic caps.

I did not download the PDF from that site.
If you post the schematics and what you need/have for voltage requirements somebody might be able to help more.

 

[sippy]

hey there,
I have a Cyrus 2 + PSX in daily use......
The PSX should, as far as i know, produce +/- 40v.
BE AWARE that if this 'diy psx' does produce the above, you cant just plug it into the amp - there are two fuses that need to be removed from inside the amp. These de-couple the on-board ps leaving it dedicated to power the 'pre-amp' section (the C2 still needs to be hooked up to the mains) and the PSX powers the 'power-amp' section.
I refer you to this thread: http://www.diyaudio.com/forums/solid-state/79759-cyrus-2-a.html ,plenty of info for the Cyrus 1/2
Expect the '2 to sound slightly 'darker' with the PSX, I'd also advise to leave the '2 powered up permanently (switch off the PSX though), it dont do it any harm and its always part ways to being warmed up....... enjoy 🙂

 

[pampalini]

Thanks for the answers....
@GloBug
I do not know how old is this PSX, but I think that it is not older than 10 years, so I guess the caps are still ok...here is a pix of the Cyrus Two power supply. Couldn't find a Psx schematics, but I read on the net that it is pretty similar to the Two power supply section...
http://img692.imageshack.us/img692/8046/cyrus2powersupplyb.jpg
...and here some pix of the original Psx...
Recent image by chalshus on Photobucket
http://img26.imageshack.us/img26/5415/psxcloseup.jpg

@sippy
Unfortunately, the psx is still in the UK, and now is "parked" in London at a friend's house. Actually he is not a teckie...just a record collector, so I cannot measure the voltage at the moment. As soon as I will have the unit I will do it, but I do not know when I will be able to get the PSX.
I know the Cyrus Two/one thread by heart, because I'm using now a Cyrus One, which was recapped by me, following the advices found on that thread...
What I am most concerned of is the trafo of this diy PSX. I searched the net to find some info about the brand, but with no luck. I do not know either which is the trafo voltage...no sign on it. Do you know by chance what type of trafo is it...here you can find all the info that I have...
http://img827.imageshack.us/img827/8656/20120226194048641.jpg
Made in UK...can you help me?
Regards.

 

[AndrewT]

If the PSX is newish then it must be similar to the current version.

The original PSX is quite different from the two versions of the PSXr.

 

[AndrewT]

The brand is ILP.

I think they were taken over by an Irish transformer company.

ILP were the cheap end of the transformer market.
The advantage is that copper was used more freely, so good regulation is available.

A "proper" audio grade transformer will bring with it some advantages. But expect to pay upto double the price of the lower end of the current market.

Toroidy supplies cheap high quality audio grade transformers.
I have two for a balanced F5. They measure well.

 

[pampalini]

If the PSX is newish then it must be similar to the current version.

The original PSX is quite different from the two versions of the PSXr.

Hi,
The PSX is not an original one, is a DIY project.

 

[pampalini]

The brand is ILP.

I think they were taken over by an Irish transformer company.

ILP were the cheap end of the transformer market.
The advantage is that copper was used more freely, so good regulation is available.

A "proper" audio grade transformer will bring with it some advantages. But expect to pay upto double the price of the lower end of the current market.

Toroidy supplies cheap high quality audio grade transformers.
I have two for a balanced F5. They measure well.

Hi again Andrew,
thanks a lot for the info! They still have a website, but no sign of the transformer inside my PSX. I will send them an email, hope they have some info.
Thanks again.

 

[AndrewT]

I think the ILP transformer codes are on the internet.
Each VA & Voltage is defined by the ILP code number.

 

[pampalini]

I think the ILP transformer codes are on the internet.
Each VA & Voltage is defined by the ILP code number.

Unfortunately there is no matching codes between the psx trafo
http://img827.imageshack.us/img827/8656/20120226194048641.jpg
and the pdf of the the ilp...
http://www.ilpelectronics.com/images/pics/transformers_mains.pdf
The type of my trafo is: 7E137
Maybe it is not a "standard range"...
Btw, I already sent them an email.

 

[emma]

Kondensatoren DNM
HTH
Emma

 

[DIP8]

Hello;
I would to build a diy cyrus psx ofr my cyrus 2;
I have the conector, 4 capacitors, diodes, a 400Va transformer with 2x30V outuput;
could I use a scheme like this?

https://i.ebayimg.com/images/g/PxQAAOSw-CFgN16Z/s-l500.jpg

Thank you ! 🙂

 

[duncan2]

Looking at the internal PS there is also a =17.8V +/- DC feeding off the main supply.

 

[DIP8]

there is +/- 40V printed internal pcb of the cyrus two

 

[Ozark HiFi Doctor]

images of the PSX service manual

I have the complete factory service manual, obtained from Mission in 1989.

I shot large JPEG for best detail, did not crop or edit for time...

 

[listentwice2002]

Hi
First generation of Cyrus II required +/-36 V DC, second generation (die-cast chassis) was designed for +/-38V .
The second generation of PSX provided regulated +/- 18V to supply the analog section of Cyrus PCM II CD-player (now rarely found) only.

 

[DIP8]

Thank you very very much!
I reallt appreciated guys