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Old 3rd March 2009, 04:11 AM   #41
Ceibal is offline Ceibal  United States
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Default 5 channel hypex amplifier

was curious if any of you have listened to the ucd700's? Wondering if there is a quality difference in the sound and if so, how much? The THD performance is outstanding and compares well to the Parasound 5250 which I have been comparing these amps to. Any thoughts?
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Old 28th June 2010, 10:29 PM   #42
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Default Hypex UCD400 schematic wanted

About
Hypex Electronics B.V.
for the UCD 400 (UCD400) I can download only the pdf files
http://www.hypex.nl/docs/UcD180400.pdf
and
http://www.hypex.nl/docs/UcD400HG_datasheet.pdf
but no schematic diagram.
Who know, where I get this and a detailled circuit description?

The circuit (see attachement) looks much more easy than that one from B&O/Sanyo ICEPOWER module about
Sanyo/B&O Icepower 200AC Rev.D, schematic about rev. engin., not complete finished
and
http://www.icepower.bang-olufsen.com...power200ac.pdf
Attached Images
File Type: jpg Hypex400Top.jpg (233.8 KB, 751 views)
File Type: jpg Hypex400Bottom.jpg (271.1 KB, 727 views)

Last edited by tiefbassuebertr; 28th June 2010 at 10:31 PM.
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Old 1st February 2012, 12:48 PM   #43
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The last post was in 2009, but I'm interested in this. I have Hypex UCD400 modules - I haven't set them up yet or made a power supply. But I'm interested in driving the output stage direct from a balanced transformer preceded by a tube stage.

Are there versions of this with the UCD400? Wondering how to change the board.

Andy
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Old 1st February 2012, 03:18 PM   #44
Koifarm is offline Koifarm  Netherlands
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Hello Andy,

i do not know if it is already done but it is quit simple.
Locate the two coupling capacitors between de opampbufferstage and the powerstage, disconnect them and use this point as input. This will only work with asymmetrical input. So signal in is the removed point from capacitor en shield must be connected to ground.

Ronny
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Old 1st February 2012, 07:38 PM   #45
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What a coincidence this thread is.

Just started developing (at work) a UCD180OEM / UCD400OEM DSP controlled amplifier (After frying the last 180 LP modules, oops!). Also being driven by the same Shanling as you!


Ronny, would you be so kind as to answer a few questions?

1. Have you compared the Hypex SMPS versus the Red rocks audio SMPS? We're currently interested in exploring other alternatives to the hypex, cost always beeing a priority

2. Re: The OEM vs standard module, have you had the chance to listen to both of these? If so, any difference in sound quality?

Thanks

I'll be watching this thread with great interest
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Old 1st February 2012, 08:53 PM   #46
Koifarm is offline Koifarm  Netherlands
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Quote:
Originally Posted by zerokelvin99 View Post

1. Have you compared the Hypex SMPS versus the Red rocks audio SMPS? We're currently interested in exploring other alternatives to the hypex, cost always beeing a priority

2. Re: The OEM vs standard module, have you had the chance to listen to both of these? If so, any difference in sound quality?
yes, i have compared the two smps with the UCD400oem modules. They sounded the same so price is an important issue.

Another issue is the opamp input stage of the hypex oem and st modules, if you use the inputstage with its supply from the smps then the background is not so quit and the highs are not so steady as with a conventional powersupply.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

If you use your own inputstage with its own conventional powersupply with is easy with the OEM modules and the smps for the powerstage then the sound can be as the Hg modules with hxr. I tested this with several opamp and tube inputstages.

Ronny

Last edited by Koifarm; 1st February 2012 at 09:11 PM.
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Old 1st February 2012, 09:15 PM   #47
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Ronny, thanks for the insight. I take it you're referring to the aux (unregulated) voltage off the SMPS - I think my boss would have kittens if I tried using that for anything LOL. The SMPS and class D topology was a massive stretch in itself..

Glad to hear that the input buffer makes a difference. We actually specialise in class A phono stages so shouldn't be too hard to make . (+ linear PS and regs)

Keep up the good work, and never stop building

Cheers,
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Old 7th February 2012, 10:37 AM   #48
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Hi andyjevans,

Wondering if you ever had any joy with the tube > tranny > class D project? I'm looking at a similar idea for an MI application. I'd be interested to know your tx specs etc.

Cheers,

Rowan
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Old 7th February 2012, 11:43 AM   #49
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I haven't put the system together yet. I have UCD400 modules and haven't so far shelled out for a 500VA 40+40 transformer. I would have preferred to build with the UCD180, but that's not what I have!! A colleague used a 300VA 35+35 with the UCD400, and I may try that. I'll use a Lundahl interstage with a PP output - I have several I can try. I have several choices for the preceding valve stage - I will use directly heated tubes myself including the 26 which can be found on the "26 pre amp" thread which is very long and useful and to which I contributed. This isn't a MI kind of setup!! Actually I'm a bass player but don't gig anymore, so though I'd be interested in a MI solution it isn't urgent.

andy
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Old 7th February 2012, 01:11 PM   #50
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Andy,
Watch the input impedance of a naked UCD 400, it is 1k8 for + and - inputs referred to ground.
Your DHT + IT will not low impedance enough to drive the UCD well; you'd need a source impedance of some 100 ohms, preferably even lower.
It can be done well with IHT's like 6H30, 5687, but I know that's not your cup of tea.
With a 26 you would need an additional buffer.
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