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Old 10th December 2011, 10:32 AM   #1
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Default Replacement for Motorola MPS-U10?

Hey everyone,

I'm repairing a Bose 1800 series amplifier and am looking to source a replacement for this transistor.

its a Motorola MPS-U10. Bose used it due to RCA discontinuing the 2N6175 back in the day.

I was hoping someone here could recommend me a replacement.

I was looking at mouser and here's what I found thats comparable:

2SC4793 (Seems ideal)
http://www.mouser.com/ProductDetail/...Vz8fc6GA%3d%3d

2N5655 (Maybe a bit slow?)
http://www.onsemi.com/pub_link/Collateral/2N5655-D.PDF

2STC5949 (Maybe excessive?)
http://www.st.com/internet/com/TECHN...CD00171942.pdf

BU406 (Also a bit slow?)
BU406 Fairchild Semiconductor Bipolar Power

The pin out on the U10 is EBC, I dont think any of the ones I found are in the same pattern. The U10 attaches to the main heatsink.

Thanks!

Last edited by jamesdean; 10th December 2011 at 10:34 AM.
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Old 10th December 2011, 02:40 PM   #2
jaycee is offline jaycee  United Kingdom
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Join Date: Apr 2004
Location: Norwich, UK
Is it the Q3 transistor ? This is a VAS cascode device. I'd say an MJE340 would work well there. You're unlikely to find anything with EBC layout (other than TO-92 package devices) so you will have to do a bit of lead bending to make it fit.
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Old 10th December 2011, 03:10 PM   #3
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Join Date: Sep 2010
Yes this is Q3. I figured I'd be stuck having to bend leads around. Probably will have to find something to extend them as well.

What were your thoughts on the 2SC4793? I came across the MJE340 in an earlier search. Should have mentioned it as well. I was leaning towards the 4793 because of the higher collector current and high Ft. Most of the others were well below the U10. Originally I dismissed the 4793 because it was only 2W however I opened the datasheet and w/ heatsink it can handle 20W.

They dont seem to mention the MJE's Ft in the datasheet.

Click the image to open in full size.

Last edited by jamesdean; 10th December 2011 at 03:16 PM.
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Old 10th December 2011, 08:58 PM   #4
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Join Date: Mar 2005
Location: Los Angeles, california
I think I have some MPS-U10, How many do you need?

I look for them, if I manage to find them I can send it to you for free.

Please email me your address.

Art
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Old 12th December 2011, 07:03 PM   #5
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Join Date: Mar 2005
Location: Los Angeles, california
Hi Kris:

I managed to find the MPS-U10s, please email me your address.

Art
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Old 10th February 2012, 07:23 PM   #6
mmgoode is offline mmgoode  United States
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Join Date: Feb 2012
Location: Indianapolis
Default MPSU10 Transistors

Quote:
Originally Posted by audiohead View Post
I think I have some MPS-U10, How many do you need?

I look for them, if I manage to find them I can send it to you for free.

Please email me your address.

Art
Hello Audiohead. Do you have any more of those MPSU10 transistors? I need a pair to fix the horizontal deflection circuit in a Heathkit AD-1013 Audio 'scope.

N9NS@ARRL.net

Thanks,
Mike in Indy
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