Aaron Millenium 3, outputs tranzistors & quiescent current - diyAudio
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Old 23rd December 2011, 01:54 PM   #1
lemon is offline lemon  Greece
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Default Aaron Millenium 3, outputs tranzistors & quiescent current

Hi @all,

I have an Aaron Millenium 3, ver1.1 (20/06/2005) with problem on an output tranzistor - left channel - (unfortunately the signs of tranzistor has deleted from the factory).
I have find the following pcb schematic and according to this, the outputs tranzistor are pairs of MJ15003/15004. Is that true and happens to all Aaron versions?
Click the image to open in full size.

If you have any other schematics about this final amplifier, I will appreciated!

If you can help me about how to set right the quiescent current, I will appreciated too (procedure and values).

Thanks
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Old 23rd December 2011, 04:24 PM   #2
AndrewT is online now AndrewT  Scotland
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My Aaron is fitted with MJ15003/4 outputs.
Aaron literature tells lies about the low impedance capability of their amplifiers.
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regards Andrew T.
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Old 23rd December 2011, 05:37 PM   #3
lemon is offline lemon  Greece
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Do you know, what pcb revision has it? - there is a refference about this, under each pcb.

What you meaning, exactly with "Aaron literature tells lies about the low impedance capability of their amplifiers"?
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Old 23rd December 2011, 07:42 PM   #4
AndrewT is online now AndrewT  Scotland
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They state the power output into 8r0, 4r0, 2r0 and 1r0 loads.
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Old 25th December 2011, 06:35 AM   #5
lemon is offline lemon  Greece
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Aaron says:
Output power continuous sine wave per channel:
100W/8Ω 0.1% THD
160W/4Ω 0.1% THD

Output power pulsed per channel:
350W/2Ω 0.1% THD
410W/1Ω 0.1% THD

At the low impedance loads the "secret" is the term "pulsed"...they don't use the term "sine wave". Factory trick!

I have the equipment to measure all of this, but I haven't the appropriate "dummy load" for this power. Usually, I use "dummy load" until 60W/4-8 Ohm.

Yesterday, I found the problem to the right channel and fixed. I have some measures (thd+N, imd) between left & right channel (left has the new MJ15003/15004G, right has the factory tranzistor).
I will upload to my next message.

Cheers.
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Old 4th January 2012, 09:40 AM   #6
lemon is offline lemon  Greece
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Happy New Year to all!

I come back with my Aaron No3. Millennium.

At listening test, everything is OK, but if you place your ear to the right speaker there is a "zzzz" from midrange & tweeter.

This appears and with thd+N metering, that there is a difference 0.023% vs 0.073%, with the noise threshold at the R channel more higher. I believe that the cause must be some transistor.

THD+N(%) Left Channel
Click the image to open in full size.

THD+N(%) Right Channel
Click the image to open in full size.

Also, my pcb differs from above schema (first message). I have per pcb 18 tranzistors vs 17 tranzistor that appears at the schema. I have enclosed two photos from my pcb.

I would be happy if someone gave me an extra pcb schema like mine board.
Attached Images
File Type: jpg aaron.JPG (332.7 KB, 455 views)
File Type: jpg aaron_3.jpg (217.1 KB, 422 views)
File Type: jpg THD_5W_left.jpg (96.3 KB, 594 views)
File Type: jpg THD_5W_right.jpg (99.4 KB, 472 views)
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Old 10th January 2012, 11:56 AM   #7
lemon is offline lemon  Greece
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Quote:
Originally Posted by AndrewT View Post
My Aaron is fitted with MJ15003/4 outputs...
Is your amp, Aaron 3 or Aaron No3. Millennium?
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Old 10th January 2012, 12:05 PM   #8
AndrewT is online now AndrewT  Scotland
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Aaron No.3 Millennium
Quote:

Here, you will find the right connection for the best speakers.

With output of

2 x 100 Watt at 8 Ohm

2 x 180 Watt at 4 Ohm

2 x 320 Watt at 2 Ohm

2 x 550 Watt at 1 Ohm

the No.3 Millennium is of course able to drive even impedance-critical speaker systems.
this is the lies. It's from
http://aaron.hifi.net/intl/no3.html
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Last edited by AndrewT; 10th January 2012 at 12:11 PM.
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Old 10th January 2012, 01:49 PM   #9
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Quote:
Originally Posted by lemon View Post
Happy New Year to all!

I come back with my Aaron No3. Millennium.

At listening test, everything is OK, but if you place your ear to the right speaker there is a "zzzz" from midrange & tweeter.

This appears and with thd+N metering, that there is a difference 0.023% vs 0.073%, with the noise threshold at the R channel more higher. I believe that the cause must be some transistor.
most likely it is, that one of the transistors T1-4 has been noisy.
Check also the zeners Z1+Z2 so as the electrolytics C2+C3 (perhaps you add bypass caps, e. g. WIMA MKS, 1uF - 4,7uF).

What happens with the difference in noise, if you short the input to GND (short therefore C1 resp. R2) ?

About
http://new.audiogon.com/listings/433779
there are various pics.

Last edited by tiefbassuebertr; 10th January 2012 at 01:59 PM.
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Old 10th January 2012, 03:28 PM   #10
lemon is offline lemon  Greece
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Quote:
Originally Posted by AndrewT View Post
Aaron No.3 Millenniumthis is the lies. It's from
AARON No.3 Millennium * The High End Stereo Power Amplifier from Germany
- I agree with you, AndrewT. There is a "trick" at 2 & 1 Ohm from Aaron (pulse measuring).
Please, it is very important to me. You said that yours Aaron output transistor are pairs MJ15003/15004. Have you Aaron 3 or Aaron No3 Millennium?

Quote:
Originally Posted by tiefbassuebertr View Post
most likely it is, that one of the transistors T1-4 has been noisy.
Check also the zeners Z1+Z2 so as the electrolytics C2+C3 (perhaps you add bypass caps, e. g. WIMA MKS, 1uF - 4,7uF).

What happens with the difference in noise, if you short the input to GND (short therefore C1 resp. R2) ?

About
Aaron No.3 Millennium Stereo High End Amplifier | Solid | AudiogoN
there are various pics.
- Thanks for the respond to me "tiefbassuebertr". The problem has resolved. There was a "cold" soldering at the ground of left channel at the rca input. Now everything is OK.

To all members: I am looking for the kind of output transistor of Aaron No3. Millennium and if there is a pcb diagram, it is welcome!
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