Audio Research M300 mono block

[Wswong]

Dear all,

Whats-App-Image-2021-01-06-at-11-50-48-AM — ImgBB

Good day to all. I have a pair of ARC M300 power amp. Refer to the image attached, this is the faulty transistor that i unable to trace the part number. Even i have check the schematic diagram in the service manual, there is no stated any part number for this transistor. Is the color is an indication for the part number? Anyone if came across this issue or have any idea to solve this, Appreciate if you can help me.

Thank you very much

Regards:
Harry

 

[petertub]

Why not contact ARC and buy the component from them ?

 

[JonSnell Electronic]

If I knew what the designation was, I would be able to give you a part number. Are they faulty? Are they jFets?
Q ?

 

[Wswong]

Hi Jonsnell Electronic. Appreciate your reply in my post. Kindly share you the photos of the board where transistor designated. Thank you


Whats-App-Image-2021-01-13-at-6-47-51-PM — ImgBB

Whats-App-Image-2021-01-13-at-6-48-23-PM — ImgBB

Whats-App-Image-2021-01-13-at-6-48-07-PM — ImgBB

Whats-App-Image-2021-01-13-at-6-47-51-PM — ImgBB

 

[Wswong]

Dear Jonsnell Electronic, Appreciate your reply in my post. Kindly share you the photo of my ARC M300 board where the transistor located. Looking forward to your reply. Thank you very much

Whats-App-Image-2021-01-13-at-6-47-51-PM — ImgBB

Whats-App-Image-2021-01-13-at-6-49-07-PM — ImgBB

 

[JonSnell Electronic]

I have no idea what the id number is as these are just photos and we need to deside which transistors they are. Is it Q3, Q4, Q5 etc.
Have you tested them and are they faulty?

 

[JonSnell Electronic]

Maybe Q15 and Q16?
If they are, they are FETs and will read odd on a dvm!