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Nesa TD-80 ID MPS transistors
Nesa TD-80 ID MPS transistors
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Old 3rd December 2017, 10:27 AM   #1
joselorenzo is offline joselorenzo  Mexico
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Default Nesa TD-80 ID MPS transistors

Hello
Someone from the forum who has a NESA TD-80 amplifier in his workshop.
I need to identify each transistor of the MPS series

The amplifier have tried to repair it and I have doubts about the correct position of each transistor

Thank you for your attention to the subject
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Old 3rd December 2017, 10:31 AM   #2
Perry Babin is offline Perry Babin  United States
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If no one can give definitive help, post a sharp, high resolution photo of the highlighted area.
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Old 3rd December 2017, 02:58 PM   #3
danmathew is offline danmathew
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can i have a bref about the NESA TD-80 amplifier please?? Actually want to know about the benefit
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Old 3rd December 2017, 10:41 PM   #4
joselorenzo is offline joselorenzo  Mexico
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Perry, thank you for the recommendation.

I already take a picture of the area. I also leave a list of the MPS series transistor assembly :
Q301: MPS42
Q302: MPS42
Q303: MPS42
Q304: MPS92
Q305: MPS92
Q306: MPS92
Q307: MPS92
Q308: MPS42
Q309: MPS56
Q310: MPS42
Q311: MPS56
Q312: MPS92
Q313: MPS42
I DO NOT HAVE IDEA IF THE ASSEMBLY ORDER OF THE MPS IS CORRECT
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Last edited by joselorenzo; 3rd December 2017 at 10:44 PM.
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Old 31st December 2017, 05:32 AM   #5
joselorenzo is offline joselorenzo  Mexico
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The order of assembly of each transistor is correct.
The damage was due to the carbon residues originating in the PCB, between the terminals of the collector base of Q306

Administrators can close the post please. Thanks
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Old 31st December 2017, 05:49 AM   #6
Perry Babin is offline Perry Babin  United States
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This is common on amps that have transistors that run hot. You can often find the building carbonization if you shine a bright flashlight from the other side of the board.
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Old 15th June 2018, 05:57 AM   #7
stefistef is offline stefistef
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This is a common issue for amps that have transistors.
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