UCD180 questions

[rick57]

Hi Gertjan

Thanks, makes sense.

Min ohms are not on the Hypex web site.
I wonder what the official Hypex line is?

Cheers

[Stevenacnj]

Originally posted by Stevenacnj
Bruno or JP

UCD 180AD

I have five of the above modules.

Purchase 4 previously, they are marked UCD 180 Rev 2.0, serial # 0466 (just one as example). All four are identical.

I just received one additional module and it looks a bit different from the above 4 modules. Serial # 0517/0155B398

I havent used any of the modules yet. I want to make five monoblock amps for my HT system.

When looking from the top of the new module, there are now two pairs of full size resistors. C 35 & 36 are BC rather than Yageo. The two 470uf caps are different shorter, brown color. On the green vertical card, on the left of the module, there also is like a larger cap protruding out. Output cap .68uf is now turned 90 degrees. Bottom side, naturally, also has differences.

My questions are:

1. What are the changes made to the newest module?

2. Does this new module sound better?

3. Am I going to have a problem getting 5 monoblock amps to sound alike?

4. Any chance to exchange 4 older modules for 4 new modules?


Thanks

Bump

[Jan-Peter]

There are no sonically difference between all versions of the UcD modules.

All modules doesn´t have a real minimum impedance. During test we always test the modules with a 1 ohm dummy load. The THD must be below 0.05%.

You can save use the modules with a very low load, when the load is very low you have to check the temperature of the UcD amplifier. This will be the real limitation.


Regards,

Jan-Peter

[rick57]

Thanks Jan-Peter!

[Jan-Peter]

Originally posted by Jan-Peter;
There are no sonically difference between all versions of the UcD modules

Of course there is difference between the standard module and the module with the AD8620 upgrade.......

Jan-Peter

[Jennice]

Originally posted by Jan-Peter


Of course there is difference between the standard module and the module with the AD8620 upgrade.......

Jan-Peter

...and that would be ??? (except for the price tag)

Jennice

[classd4sure]

Originally posted by Jennice



...and that would be ??? (except for the price tag)

Jennice

He was posting to correct himself. Previously he stated there was no _sonic_ difference between modules, he meant from say the ucd180 to ucd400, though personally I'm sceptical of that, there must be _some_ small difference, c'mon, admit it

Anyway Jennice, the reason for the difference in cost for the upgraded version is obvious, go look up what an AD8620 would cost you from digikey as compared to an opa134. He's obviously not just stamping an upgraded mark so he can raise the price of the module. You're just getting what you're paying for.

So your question now should be, what am I paying for in the AD8620 that I _don't_ get with an OPA134, and the answer of course lies within their respective data sheets, specifically, on the THD Vs Frequency curves, one is a little more in tune with the nature of the amplifier, so you can now decide if that's worth it to you. It would be for me.

Regards,
Chris

[Jennice]

Hi Chris,

Thanks for your explanation. That's the kind of thing I was fishing for

Jennice

[Jennice]

Originally posted by Jan-Peter
During test we always test the modules with a 1 ohm dummy load. The THD must be below 0.05%.

You can save use the modules with a very low load, when the load is very low you have to check the temperature of the UcD amplifier. This will be the real limitation.

I have a stack of 24V transformers at home doing nothing (for the time being). somehow I think they're trying to whisper in my ear that they want to be mated with UcD180's.

This brings me to my question: If I should find need for it, can two UcD180 modules be used in bridge, provided that the heat sink is sufficient?

Jennice

[Stevenacnj]

Originally posted by Stevenacnj
Bruno or JP

UCD 180AD

I have five of the above modules.

Purchase 4 previously, they are marked UCD 180 Rev 2.0, serial # 0466 (just one as example). All four are identical.

I just received one additional module and it looks a bit different from the above 4 modules. Serial # 0517/0155B398

I havent used any of the modules yet. I want to make five monoblock amps for my HT system.

When looking from the top of the new module, there are now two pairs of full size resistors. C 35 & 36 are BC rather than Yageo. The two 470uf caps are different shorter, brown color. On the green vertical card, on the left of the module, there also is like a larger cap protruding out. Output cap .68uf is now turned 90 degrees. Bottom side, naturally, also has differences.

My questions are:

1. What are the changes made to the newest module?

2. Does this new module sound better?

3. Am I going to have a problem getting 5 monoblock amps to sound alike?

4. Any chance to exchange 4 older modules for 4 new modules?


Thanks

JP

What kind of crap answer was this:

"There are no sonically difference between all versions of the UcD modules"

How about addressing the questions I posted? What reason to change the modules, if it doesnt make them sound better?