Pass ZEN cheapo ebay special.

[Munga]

Hi All,

Does this look like a copyright infringement to anyone? Does it appear to use a Nelson Pass design or are they just trying to use his name to sell them?

eBay Australia: Buy new & used fashion, electronics & home d?r

 

[Nelson Pass]

Trademark infringement.

 

[Munga]

You should take it as a compliment, and then sue them.

 

[tiefbassuebertr]

Trademark infringement.

Whether or not trade mark infringement - I doubt whether there is any justification for such amp devices with only the unimportant devices with respect to the costs;
The really expensive devices are always not mentioned in such offers:
Heatsink, transformers and capacitors.
An exception can be found here (information unfortunately only in German):
Home - André Buscher Audiotechnik - Puristische Eintaktverstärker
(Single Ended Power Amplifier Modules for Purists)
Start by only 250 euros for a stereo module include all parts except the enclosure; from my view not expensive for a 2-CH completly power amp module.
If I tend to buy a PCB with parts as show about
http://www.ebay.com.au/itm/ws/eBayI...648455&ssPageName=STRK:MEWAX:IT#ht_1810wt_905
it is better to buy a SRBP matrix board from Vero like this
http://uk.rs-online.com/web/p/prototype-development-boards/4853892/
and the components individually (then I can choice high quality caps and must not accept the low-cost caps from the provider in HongKong).
The number of simple and good circuits for SE amp projects is alone here on diyaudio very large.

 

[Mr Teal]

Obviously not trademark infringement, this amp uses MOSFET tubes.

Reference ZEN line design single-ended A senior Liangsheng amp on the board with a rectifier filter, dual-channel fully independent design (ground are completely independent) using FET voltage power supply. Regulator, constant current control, amplifier tubes are used new original IRF610 MOSFET, quiescent current 380MA! Adjustable. Mellow sound, music, gorgeous, quite a tube amp style. Load capacity, pushing 32-600 EU good performance headset can also be pushed directly to the speaker in Europe, 4-8, when the little 5W amp, the sound is very good. FET design of the edge of the board can be easily fitted to any size of the radiator, if it is aluminum chassis, you can also install the tube horizontal, the base plate when the heat is very convenient

Where do you think they got the "used new original IRF610" FETs?

 

[Nelson Pass]

I find that when I use "search and replace" functions to edit earlier product
text I get results like that.

 

[dave_gerecke]

PPFFFFTTTT!!! Papa uses IRF610 as preamp transistor. This copycat isn't even a good copycat. Pathetic and insulting.

Peace,

Dave

 

[tiefbassuebertr]

Obviously not trademark infringement, this amp uses MOSFET tubes.

I don't understand this.

Where do you think they got the "used new original IRF610" FETs?

By exactly look to the images I read the logo from Siliconix on the surface from the IRF610.

 

[Karsten Sømand]

I don't understand this.

Hi,

About MOS-FET tubes - it´s written in the description. I think this guy is using a HUGE PSU since he states that the current is 380 MA!!! Ok, maybe he meant 380 mA?! ;-)

Karsten

 

[slownlo]

An externally hosted image should be here but it was not working when we last tested it.

Guilty as a sex maniac in a brotel with a credit card...
I bought them because they made building the design simpler...
sounds pretty good...lacking bass

 

[tiefbassuebertr]

Hi,
About MOS-FET tubes - it´s written in the description. I think this guy is using a HUGE PSU since he states that the current is 380 MA!!! Ok, maybe he meant 380 mA?! ;-)
Karsten

I don't find it in the text from currently auction.
This amp looks at first look like a headphone amp.
Here the schematic, ordered from there:

 

[Andersonix]

With a bit of vigilance, seems DIYAudio members could keep up with eBay thieves by reporting items known to be rip-offs? (I reported this Zen to eBay -- click 'report item.')

 

[Karsten Sømand]

Hi tief....

3rd line below the picture:

"Regulator, constant current control, amplifier tubes are used new original IRF610 MOSFET, quiescent current".....

Hope this helps

Karsten

 

[tiefbassuebertr]

Hi tief....

3rd line below the picture:

"Regulator, constant current control, amplifier tubes are used new original IRF610 MOSFET, quiescent current".....

Hope this helps

Karsten

I don't ask to the term "amplifier tubes" but to the term "MOSFETs tubes".
This means in China power MOSFET's in the TO-220 and TO-247 outline - so I think.

 

[vizion]

380mw total bias per channel equals 0.57wpc Class A @ 8 ohms

 

[sangeet2]

An externally hosted image should be here but it was not working when we last tested it.

Guilty as a sex maniac in a brotel with a credit card...
I bought them because they made building the design simpler...
sounds pretty good...lacking bass

My build went pretty smooth and the amp works. BUT:
I do have hum
The Transformer is about 20 cm away from the amp sitting on my desk, as I am still waiting for the case...
Connecting the case to signal ground didnt make any difference.
Any help is apprechiated

 

[Zen Mod]

more info

 

[godfrey]

The Transformer is about 20 cm away from the amp sitting on my desk, as I am still waiting for the case...
Connecting the case to signal ground didnt make any difference.

how did you connect the case to anything if you haven't got it yet?

 

[sangeet2]

how did you connect the case to anything if you haven't got it yet?

I have a case for the amp, the transformer will get a separate case.

 

[sangeet2]

more info

I have the same amount of hum with inputs not connected and volume turned down completely. I dont measure any DC on outputs, and it doesnt make a difference either, if I shorten the inputs…

Hmmm, do I have to connect the input grounds on the PCB with a wire? As the PSU caps and the the rectifier are on the PCB...