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Old 14th April 2012, 12:29 PM   #1
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Default YBA PASSION 1000

i have an YBA passion 1000 to repair ( i have no probs repairing it ) but inside there is like a gozillion design lies and flaws compared to the user manual and the all construction looks way too much diy

the unit has a serial number and the boards inside are marked 9/2003 does anybody have a clue why this amp is made so bad ?
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 17th April 2012, 12:41 PM   #2
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amazing ...anyone ?
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Old 17th April 2012, 03:26 PM   #3
Wino is offline Wino  Sweden
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Default YBA

Hi Sakis!

For what its worth, the YBA:s I have seen inside have all been VERY neatly laid out with industrial quality in both PCB and components. So this leaves us with following:

Could it be some sort of (eastern) copy?
Have any self appointed "engineer" butchered the inside?

Just my 2 cents.....

Wino
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Old 17th April 2012, 03:44 PM   #4
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Or have a previous owner completely rebuilt it instead of repairing the original circuit ?
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Old 17th April 2012, 08:28 PM   #5
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Sakis,
Post some photos of the amp
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Old 17th April 2012, 09:04 PM   #6
tvi is offline tvi  Australia
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Quote:
Originally Posted by audiobard View Post
Sakis,
Post some photos of the amp
Yes, a jpg is worth a 1000ish words
and there are few nude shots of this amp on the interwebs
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Old 18th April 2012, 12:38 PM   #7
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well to be honest the subject is "running " also on a Greek forum and actually is a quiet serious issue and in between and after a few phone calls first i found out that YBA as we know it doesnt exist any more A chinese company is pulling the strings now not possible to talk with the guys on the phone and phone numbers in france also dont work anymore and the web of te company is not properly updated

Though after a few calls in France i was promised that mr YBA him shelf will take a look at my email and provide me with answers .

I may start by re posting the e mail i ve sent to YBA and then i will post some pictures also

here is the email ...


Dear sir

One costumer of our company brought in for service /repair one of your amplifiers YBA passion 1000 and there is a number of problems and questions about that need to be answered....


The unit serial number is 902001

-----The unit has no CE marking on it
-----The unit had no electrical ground ever connected on the standard IEC connector that is located on the rear panel
-----The power supply cord marked as YBA has also no ground on it
-----There is a device that looks like a power conditioner coming with the amp without CE marking , without ground ,and without any electrical information on it regarding model/power /ratings/safety
-----Please notice that only cables of the power conditioner are marked as YBA and there is no other marking on the device
-----Please notice that beyond no markings present all ground points on the ( french standard three pin ) power splitter are cannibalized /chopped off the power splitter

Generally there is also a number of things that the costumer is concerned about that don't actually meet the spec manual of the amplifier

----balanced XLR leads exists on the rear panel but inside there is no balanced circuit and/or any additional information regarding a balanced connection exists on the rear of the amp or the manual
----Even tough it is clearly stated in the manual that transistors are mounted in solid copper and with out mika insulators in reality the metal is either bronze or anodized aluminum in a gold color and transistors are mounted with mica insulators
----There is all short of wiring and soldering problems in the soft start board and seems that something is wrong there the all circuit looks very """hand made """
----There is got to be some bias issue since your manual states an undefinable class .... ( class Alpha ) which obviously is not class A and as we speak the unit is biased at 5ma /device and to our understanding this amount of bias is barely enough for a class AB amplifier
----The unit after scope readings shows limited bandwidth and asymmetrical clipping yet to be defined if this is a design issue or some kind of failure
----The unit also has a number of M10 nuts fitted as spacers between the main sassi and the top cover , fitted with longer screws , to create a gap between the top cover and the main sassi probably to ensure fresh air flow inside the amplifier .Problem is that this gap is almost 10 mm wide and that doesn't look very safe .


Now the actual problem started when the costumer ( which is also a father of of two young children ) noticed a small electrical leak when touching his YBA preamplifier or the amplifier ...The leak was enough to feel with his hands but not enough to trigger the existing safety relay that is a standard in electrical installation in Greece ( obviously this is expected when equipment features no electrical ground ) .As a father of two young children our costumer was furious requested a qualified electrician to trace down the electrical leak which was due to a faulty DVD player , and then requested our company to run a full safety check on his amplifier for starts . Above you have our findings and once more we will have to tell you that the costumer is furious regarding all the findings around the particular YBA passion 1000 and he was also ready to inform the Goverment's Consumers Institute regarding the ground issues and the CE markings .


We advised the costumer to consult with YBA first ,please let us know what is wise to do .Obviously the above findings may not state if these are factory issues or other issues .Generally the picture you get by looking inside the machine is that is very hand made , or a machine that is not coming form an organized manufacturer .

Now ...after the electrical problem and combined with the rest of the issues the costumer has seen on the amp the truth is that your costumer has lost trust in your company taken also in mind that this is not an amplifier that costs 500 euros . We actually know very little for the history of the amplifier and one may not tell if the amp is original and factory made or it has been a subject to any modifications by any unauthorized technician .The all amplifier looks like a "demo" version ....Please notice that we also have pictures of our findings and you are kindly requested to advise us on how to proceed from here.

Thank you very much .

Kind regards
Sakis Petropoulos
( Electronics Engineer of National Technical university of Athens )

+302294091111
+306944879399
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Old 18th April 2012, 12:42 PM   #8
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some pictures

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 18th April 2012, 12:43 PM   #9
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and a few more

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that will be square at 10KHZ
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Last edited by east electronics; 18th April 2012 at 12:46 PM.
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Old 18th April 2012, 12:45 PM   #10
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Click the image to open in full size.

and that will be square at 30khz
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