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Old 13th January 2008, 03:30 PM   #1
Koifarm is offline Koifarm  Netherlands
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Default Hybrid Hypex UCD

Here in the Netherlands they build a great amplifier module from Hypex (http://www.hypex.nl)the Ucd series. I have the standard serie and i used it for 2 years. The modules sounds perfect, so perfect that with time i got boring. I read a lot of the modifications with were possible but nowhere a read about using a tubebufferstage for the Ucd. Luckely a had experience with the modification of my shanling CD-T100se(http://www.hififever.com/forum/viewtopic.php?t=1738) and so i spend this chrismas holiday by modificate my Ucd amplifier.

Goal:

- Do not use the opamp inputbuffer. Direkt drive the UCD.
- Bypassing the 22uF decoppling capacitor.
- Improve the sound with some more live.

Reminders:

- Input impedance = 10k
- Source must be DC free
- Compensate 4,5 X gain of the opamp

At work:

I removed the decoppling caps of 22uf from the UCD pcb.
They were between the opampinputbuffer and the UCD powerstage. Then i connect the input sym.+ en sym - to the new points on the PCB according the picture below.

Click the image to open in full size.

Now i only need a max 5 V rmss input signal with i can get from my shanling player by using a higher value of the I/V resistor in my tube output stage.
My shanlingplayer is the first 10 seconds not DC free so i must wait 10 sec before i press play the first time. Other wise the UCD going pumping.

If you have a tubepreamp with has 5 Vrmss output you can use that.

For the people who want to intergrate the tube stage in to the UCD housing i have a nice schematic.

Click the image to open in full size.

This is the same SRPP circuit i use in my shanling player but with other tubes ( 6N6P ). With enough gain ( 11 X ) and working with a voltage of 40 V and higher so you can use the original UCD power supply. For the heather voltage you can use 12 V by putting two tube heaters in serie.
This SRPP circuit you can build ones a channel for RCA input and twice a channel for symmetrical input.
The sound of this SRPP circuit i perfect, see this link from Polen.

http://www.lampizator.eu/

At how about the sound the UCD are now alive. I like it.

Last edited by Koifarm; 14th May 2014 at 06:54 PM.
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Old 20th January 2008, 02:54 PM   #2
Koifarm is offline Koifarm  Netherlands
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After one week of listening to the 6N6P tube, i have now placed the ECC99 tubes. After i switched the heater connection.
One thing i heared directly the ECC99 has less bass but also less noise. I will listen this week to the ECC99.
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Old 30th January 2008, 04:23 PM   #3
Koifarm is offline Koifarm  Netherlands
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After using the circuit for a month and build several for friends, one thing is very important. If possible let the tubestage warmup for 20 sec and then turn the UCD on. During warmup there is a lot of DC at the output of the tube this can damage the UCD.

If you intergrate the tubestage in to the UCD housing and you use one on/off switch then ad a relais contact shorten the tubestage output to ground. When switch on a timer can drive the relais after 20 sec. to open the relaisontact. The timer can be a simple circuit with NE555 or just RC and fet.

My friends and i like the sound of the 6n6 tube with the UCD.
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Old 20th February 2009, 07:56 PM   #4
Koifarm is offline Koifarm  Netherlands
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My newest project is ready.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

- More detail, instruments and artist are clearer.
- More staging also left, right and behind me plays the music.
- More midbass, the snaredrums lance the speaker conus.
- Very easy playing and nice to listen to.

This is in comparision to the audioromy fu13 in own.

Used parts:

- Brothers LU 64 db step volume controll with input select and remote. ( custom made with 20 delay ).
- 6n6p SRPP tubebuffer.
- Hypex UCD400 class D amplifier.
- Redrock 1000 Watt SMPS.
- DIY Gene aluminium case.
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Old 21st February 2009, 04:35 AM   #5
Ceibal is offline Ceibal  United States
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Default Hypex UcD400 5 channel amplifier

Wanted to know how to figure out the size of the toroidal transformer you will need for 5 of the Hypex UcD400's? Also, looking for ideas on capacitors for the power supply. Was looking at Mundorf since they have a good reputation for use in speakers. I am new to this but have always wanted to build my own amplifier and this looks like the best way to start and learn. Any help is welcomed.
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Old 21st February 2009, 09:15 AM   #6
Koifarm is offline Koifarm  Netherlands
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Ceibal, as you see i do not use toroidal transformers anymore.
The SMPS works great and performs even better as the toroidal transformer setup.

Why i use SMPS now:

- As good or even better sounding as toroidal transformer ( less humm ).
- Lighter in weight.
-Easy to use and install.
- Cheaper ( for 2000 Watt you need 2 x Redock 1000Watt SMPS cost 280,- with the toroidal setup it cost at least 500,- ).

In your case use 2 Redrock 1000Watt SMPS and you do not have to doubt over with capacitors you have to use. Use one SMPS for the two front channels and the other SMPS for the mid and surround channels asuming you use it in a dolby setup.
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Old 21st February 2009, 03:55 PM   #7
Ceibal is offline Ceibal  United States
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Quote:
Originally posted by Koifarm
Ceibal, as you see i do not use toroidal transformers anymore.
The SMPS works great and performs even better as the toroidal transformer setup.

Why i use SMPS now:

- As good or even better sounding as toroidal transformer ( less humm ).
- Lighter in weight.
-Easy to use and install.
- Cheaper ( for 2000 Watt you need 2 x Redock 1000Watt SMPS cost 280,- with the toroidal setup it cost at least 500,- ).

In your case use 2 Redrock 1000Watt SMPS and you do not have to doubt over with capacitors you have to use. Use one SMPS for the two front channels and the other SMPS for the mid and surround channels asuming you use it in a dolby setup.
Thanks for the recommendation. Is there not a need for capacitors in this setup? Where is the best place to order one of these and learn about them? Thanks again. Sounds like it will make this an easier project.
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Old 21st February 2009, 06:40 PM   #8
Koifarm is offline Koifarm  Netherlands
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No need for extra capacitors. It is even possible to use one SMPS for the five amps. Piek output power is 2000Watt. You can place you order at the factory.

Just email what you need and ask for the price incl. shipment.
Ad to the order that you need +/- 60Volt version for the UCD400.

http://www.redrocksaudio.es/files/SMPS6060PFCen.pdf

http://www.redrocksaudio.es/
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Old 22nd February 2009, 05:05 AM   #9
Ceibal is offline Ceibal  United States
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Default Hypex UcD400 5 channel amplifier

My concern is the quality of the capacitors it uses. Do you know the brand or any specs on them? I know from other forums that the capacitor on the power supply can make a big difference in the sound quality. Have you compared this power supply to others? Sounds good but want to insure this is the best possible way to go.
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Old 22nd February 2009, 05:22 AM   #10
Ceibal is offline Ceibal  United States
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Default Hypex UcD400 5 channel amplifier

Does it have enough connections for all 5 amps? If not, how would this work?
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