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Old 22nd February 2009, 09:07 AM   #11
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Hi Koifarm,

I love your concept but have a few thoughts about your driver withan Ia of 8mA driving 9V into 1,8k.

Are you really using exactly the circuit shown above? It will not work without distortion well above 1%.
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Old 22nd February 2009, 09:32 AM   #12
Koifarm is online now Koifarm  Netherlands
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Default Re: Hypex UcD400 5 channel amplifier

Quote:
Originally posted by Ceibal
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.
I do not know the brand of them. Next time i disamble the amp i will look for you. I now they have a much lower value then i normal use in normal powersupply's for the UCD modules. It is not my goal to build the best amplifier but this one sounds for me the best i heard i my 40 years of audio experience. Looking on the budget it is the biggest bang for your bucks. Where do you get a 1000Watt( 2000Watt max ) power supply for € 130,-. There will always a better solution. But enjoying the present one is great.


Quote:
Originally posted by Ceibal
Does it have enough connections for all 5 amps? If not, how would this work?
It has two connectors a terminal. You can build a powerrail( 3 times, +,- and ground of copperstrip ) from were you connect the amps.


Quote:
Originally posted by revintage
Hi Koifarm,

I love your concept but have a few thoughts about your driver withan Ia of 8mA driving 9V into 1,8k.

Are you really using exactly the circuit shown above? It will not work without distortion well above 1%.
I use the same principle but the above diagram is optimized for 120 V and a output impedance of 8k2. I used 68 Ohm resistors no resistor in the anode. And two 100uF/50V Nichicon Gold Muse Capacitors antiparallel bypassed with Wima 100nF/250V as output capacitor. I will place diagram soon.

Click the image to open in full size.
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Old 22nd February 2009, 11:23 AM   #13
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Hi Koifarm,

Oooops! This makes it even worse as according to my calculations current is now ca 4mA.

THD of 9V into 1,8k will be gross and probably over 10%! Have you done any measurments?

Why not try an 6N30P instead as these are more linear at this extremely low voltage. It will draw about 12mA in this circuit.

Also a B+ of at least the double would be fine.
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Old 22nd February 2009, 04:31 PM   #14
Koifarm is online now Koifarm  Netherlands
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Quote:
Originally posted by revintage
Hi Koifarm,

Oooops! This makes it even worse as according to my calculations current is now ca 4mA.

THD of 9V into 1,8k will be gross and probably over 10%! Have you done any measurments?

Why not try an 6N30P instead as these are more linear at this extremely low voltage. It will draw about 12mA in this circuit.

Also a B+ of at least the double would be fine.
I do not now how you calculatebut i use this:


http://www.ict-net.net/tube.xls

I can not hear any distorsion at high levels. So it must below 0.5%.
I do not measure only if there problems. If my ears tell me it sounds great, why measure? Great specs says really nothing about the sound.
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Old 22nd February 2009, 05:27 PM   #15
Koifarm is online now Koifarm  Netherlands
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Lars tuberolling i did in the past. My favourit is the 6n6p not the 6n30p or ecc99. Sound is very personal. I like the little bump in the frequentiecurve( around 400 Hz ) of the 6n6p.
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Old 22nd February 2009, 06:23 PM   #16
Ceibal is offline Ceibal  United States
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Default Hypex UcD400 5 channel amplifier

I was reading about switch mode power supplies and was wondering about some of the disadvantages. My book state that they have very high levels of EMI emissions, poor reliability and poor transient current response. Of course, this book was written around 1999 and allot has changed but was curious if they have solved these issues? Also, with my limited electronic know how, I am unsure how to build the power rail. I like challenges but I will need a way to learn how to build it. Any ideas as to where I can get a good idea of how to do this?
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Old 22nd February 2009, 06:48 PM   #17
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Hi Koifarm,
I am sorry to disappoint you but the spreadsheet is useless for this. With 30V over each triode it won´t work without gross distortion.

You have to check tubecurves or use Spice.

This is agood starting point:

http://klausmobile.narod.ru/testerfiles/6n6p.htm

I can help you, just drop an E-mail.

Your circuit has potential but you must get the figures right !
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Old 22nd February 2009, 08:45 PM   #18
Koifarm is online now Koifarm  Netherlands
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Lars let me see your alternetive with the right figures. And probaly i will tell you it is one i tested before.

Tested more then 100 SRPP setups on my shanling CD- T100se. On this player i can build two SRPP output stages and do ABX testing with a lot of persons. They point if they can hear the difference or not. I do this for 3 years. After this period i like the SRPP setup. I also tested different anode voltage and different current setup's.
The difference between 120V or 60V was not notable for every person. Below 49 V the tube do not work fine anymore and it will be notable.

The spreadsheet is a guideline, your ears and emotion are the finetuners. But maybe you can tell me something new.

Ceibal, this SMPS is made for audio. It is simple to make a nice powerrail. Take 3strips of copper( 2 x 12 mm or so ) mount them on isolators. Connect from the powersupply the +, - and ground to them. Then tap from the powerrail the +. -, and ground for each UCD module. I hope you get the picture.
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Old 22nd February 2009, 10:43 PM   #19
Ceibal is offline Ceibal  United States
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Default Hypex UcD400 5 channel amplifier

You have to keep in mind I have never done this before. So, it all about learning at this point. I can somewhat picture this but was wondering if you had any pictures? Or, at least a pic of a power rail?
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Old 22nd February 2009, 10:58 PM   #20
sek is offline sek  Germany
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Hi Koifarm,

just a quick side question: Where did you get those OEM modules from?

Cheers,
Sebastian.
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