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Old 19th May 2010, 03:15 AM   #1
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Default What type of integrated amp is this please.

Hello Forum:
Click the image to open in full size.
I have a picture of the internals of a YBA Integre.
From looking at it from my inexperience, I don't recognize a transistor output section or heat-sinks - although I am sure that there are
Could someone comment on the internals and perhaps the over-all design and sonic qualities?
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Old 19th May 2010, 03:41 AM   #2
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Quote:
Originally Posted by philmagnotta View Post

From looking at it from my inexperience, I don't recognize a transistor output section or heat-sinks
Output devices hi-lited. Chassis is the heat-sink

dave
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Old 19th May 2010, 09:07 AM   #3
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...heatsink highlighted red - a sheet of aluminium bended two times
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Old 19th May 2010, 09:09 AM   #4
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beyond that looks like an excellent made machine .... dont expect loads of power but yeap it looks very fine
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Old 19th May 2010, 12:36 PM   #5
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Thanks to all for drawing those sections for me, such excellent help on this site!
I'm going to do some more search on this unit, but so far it is stated to put out:

50 watts at 8 ohms and
90 watts at 4 ohms using Class Alpha Amplification.

Is Class Alpha similar to or the same as Class A?
It would seem a rather small heat sink assembly for Class A...no?

Also, this unit is five years old and spent its life on the east coast of Florida - although in an air conditioned home. Is this a possible issue with the components?


Last edited by philmagnotta; 19th May 2010 at 12:39 PM.
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Old 19th May 2010, 12:46 PM   #6
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can be an issue ...but looking at the all set up size of trafo cooling facilities it doesnt look like real Class A equipment ...

it is probably a normal class AB amplifier only instead of 30-50ma that is the normal bias for a comercial amplifier this one is probably biased at 120-300 ma to come closer to class A but not pure class A

that doesnt mean that this a bad amplifier on the contrary it can be a very nice amp ...looking ata the quality of material and the quality of built i think that is a superb piece of equipment

regards sakis
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Old 19th May 2010, 12:49 PM   #7
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50 watts in pure Class A would require a much much larger heatsink and PSU.

It's probably some "marketing speak" for a sliding bias class ab or something like that.

Amplifier classes are well defined... either it is or it isn't

Just out of interest what are the device numbers on the output transistors ?
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Old 19th May 2010, 01:02 PM   #8
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Quote:
Originally Posted by Mooly View Post
50 watts in pure Class A would require a much much larger heatsink and PSU.

It's probably some "marketing speak" for a sliding bias class ab or something like that.

Amplifier classes are well defined... either it is or it isn't

Just out of interest what are the device numbers on the output transistors ?
I don't know what the device numbers for output transistors are. I might be able to find out and will reply.
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Old 19th May 2010, 01:05 PM   #9
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Quote:
Originally Posted by philmagnotta View Post
I don't know what the device numbers for output transistors are. I might be able to find out and will reply.
Don't worry... I only meant the numbers printed on the top of the those transistors on the heatsink.

Sometimes manufacturers rub them out and paint them over.

They don't like you knowing they used TIP3055 etc
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Old 20th May 2010, 10:38 AM   #10
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Quote:
Originally Posted by planet10 View Post
Output devices hi-lited. Chassis is the heat-sink

dave
great similarity to Densen's integrated amps:
Densen amp
for normal home hifi applications in Class AB enough (idle current <100mA/channel).

Are there schematics from this YBA model?

Last edited by tiefbassuebertr; 20th May 2010 at 10:41 AM.
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