PSU1 versions
Printed From: Graham Slee Hifi System Components
Category: And the rest
Forum Name: Power Sources
Forum Description: Where the power comes from has always been a hot topic - even more so now with new World legislation
URL: https://www.hifisystemcomponents.com/forum/forum_posts.asp?TID=2156
Printed Date: 27 Mar 2026 at 4:52am
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com
Topic: PSU1 versions
Posted By: suede
Subject: PSU1 versions
Date Posted: 03 Feb 2014 at 7:23pm
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I've currently got two PSU1 units and they were purchased with about a year between them. During that time I think some small improvement was made to the design and so they're not exactly identical. Now I seem to have mixed them up and don't know which PSU1 came with which unit. It might be a stupid question but is it as simple as lower serial number equals older PSU1 unit? ------------- Proprius, Reflex M, Solo UL, Bitzie, CuSats & Spatia --------------------------------- Johan |
Replies:
Posted By: BAK
Date Posted: 03 Feb 2014 at 9:00pm
You are probably correct about the serial numbers.
But I am sure that the older PSU1 should be the same quality power and sound.
I would use them as interchangable.
The PSU1's are all designed to provide filtered 24 volts DC regulated power; all of the GSP kits connected to a PSU1 have their own internal power filter and regulator.
This amounts to a Mains AC power stepdown and DC conversion in a separate power unit to be located 1 meter or more away from the GSP kit connected. This is meant to keep the AC power as far away from the sensitive audio circuits, thus reducing AC hum pickup.
Bruce ------------- Bruce AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way! |
suede wrote:Posted By: suede
Date Posted: 03 Feb 2014 at 9:43pm
Yes they both work excellent but I believe Graham did a small tweaking of the PSU1 design between my purchases in early 2011 and 2012 making them slightly different editions. I'm just interested to learn if there's a way of telling which PSU1 came with which unit as I've now got them mixed up. It's no problem or anything, I'm just curious.  ------------- Proprius, Reflex M, Solo UL, Bitzie, CuSats & Spatia --------------------------------- Johan |
Posted By: Graham Slee
Date Posted: 03 Feb 2014 at 11:07pm
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2011 starts 014 and 2012 starts 015. ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |
Posted By: suede
Date Posted: 04 Feb 2014 at 1:54pm
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Thanks Graham. I have 013 and 015, but the older unit (Solo UL) was purchased from an ebay vendor so I'm assuming I got a 2010 stock unit then. ------------- Proprius, Reflex M, Solo UL, Bitzie, CuSats & Spatia --------------------------------- Johan |
Posted By: Richardl60
Date Posted: 04 Dec 2014 at 1:48pm
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Hi, the latest version of teh PSU have form of din plug rather than hard wired which is good for convenience and the cabling is more substantial but an extra connector is never that welcome! Whilst I have yet to use my new Revelation and PSU, I have noted the new PSU appears to run 'cold' vs my existing PSUs are quite warm to the touch - same location. Is this a feature of the later/current versions? May seem like a daft question but presumably the current PSU do sound better than the old ones - I will be selling a PSU and don;t want to let a potentially superior one go (yes I can use my ears) but wonder if anyone had any experience? Regards Richard
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Posted By: Graham Slee
Date Posted: 04 Dec 2014 at 6:54pm
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Richard, I'd not noticed the cooler running myself. The PSU1 will run hot if called upon to deliver a lot more current - for example, used with the Majestic DAC it gets much warmer than when used with a Gram Amp. If anything it may be due to the latest "auto-fused" transformer. It may be a better batch of transformer steel: we specify a certain quality for reduced magnetisation current, and if a batch is even better than that, the magnetisation current will reduce further, and that would reduce idling current consumption and hence heat output. Graham ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |