Go Back   Home > Forums > Amplifiers > Power Supplies

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 2nd March 2012, 12:45 PM   #1
diyAudio Member
 
Join Date: Jul 2011
Question Cyrus PSX diy - Advice needed

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
  Reply With Quote
Old 4th March 2012, 11:17 PM   #2
GloBug is offline GloBug  Canada
Banned
 
Join Date: Jun 2011
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.
  Reply With Quote
Old 5th March 2012, 12:05 AM   #3
sippy is online now sippy  United Kingdom
diyAudio Member
 
Join Date: Jun 2008
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: cyrus 2 ,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 :-)
  Reply With Quote
Old 5th March 2012, 05:12 PM   #4
diyAudio Member
 
Join Date: Jul 2011
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/img692/8...wersupplyb.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/img827/8...6194048641.jpg
Made in UK...can you help me?
Regards.
  Reply With Quote
Old 6th March 2012, 10:19 AM   #5
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
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.
__________________
regards Andrew T.
  Reply With Quote
Old 6th March 2012, 10:22 AM   #6
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
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.
__________________
regards Andrew T.
  Reply With Quote
Old 6th March 2012, 11:06 AM   #7
diyAudio Member
 
Join Date: Jul 2011
Quote:
Originally Posted by AndrewT View Post
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.
  Reply With Quote
Old 6th March 2012, 11:08 AM   #8
diyAudio Member
 
Join Date: Jul 2011
Quote:
Originally Posted by AndrewT View Post
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.
  Reply With Quote
Old 6th March 2012, 11:23 AM   #9
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
I think the ILP transformer codes are on the internet.
Each VA & Voltage is defined by the ILP code number.
__________________
regards Andrew T.
  Reply With Quote
Old 6th March 2012, 11:31 AM   #10
diyAudio Member
 
Join Date: Jul 2011
Quote:
Originally Posted by AndrewT View Post
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/img827/8...6194048641.jpg
and the pdf of the the ilp...
http://www.ilpelectronics.com/images...mers_mains.pdf
The type of my trafo is: 7E137
Maybe it is not a "standard range"...
Btw, I already sent them an email.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Advice on refurbishing a Mission Cyrus 2 & PSX ianp Solid State 6 13th February 2014 11:47 AM
Cyrus 2 Repair Advice Needed roguerobot Solid State 65 16th May 2013 07:27 PM
Cyrus PSX dead gfredriks Solid State 97 1st April 2011 08:43 PM
mission cyrus 2 PSX bonjaribros Solid State 4 31st July 2008 10:28 PM


New To Site? Need Help?

All times are GMT. The time now is 01:51 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2