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Old 30th October 2012, 12:27 PM   #1
Einric is offline Einric  United States
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Default Replacement For MPSU10/60

Any suitable replacements for the MPSU10/60 sets?
Even something more capable maybe?

This is for a VSP Labs TransMOS 150, I can probably pick it up for around $40 since one channel won't work.
If the repair costs are not extreme it would be a wonderful amplifier to have.
If the parts end up costing too much then it is worth it for the Power Supply and Chassis for my own projects.

Different pinouts don't really matter because I could wire them with leads to the board.

Last edited by Einric; 30th October 2012 at 12:41 PM.
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Old 30th October 2012, 01:06 PM   #2
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Why more capable ?? Anyway these are, 2sa1381/2sc3503.
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Old 30th October 2012, 07:23 PM   #3
Einric is offline Einric  United States
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The MPSU10/60 have a 10W rating and the 2sa1381 is only 7W.
How do I know how much wattage I actually need to determine if it is a good substitute?
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Old 30th October 2012, 11:12 PM   #4
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The 10W dissipation of the MPSU10/60 is very rarely neccesary to take in point.

You find them often mounted without any heatsink, or with a heatsink only capable to dissipate around a watt or two.

The 2sa1381/2sc3503 will sustitute them just fine
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Old 31st October 2012, 12:54 AM   #5
Einric is offline Einric  United States
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I guess the only thing left is to ask about the collector current the MPSU10 is 500mA and the 2sa1381 is 100mA.
Does this make much difference or is it hard to tell without a schematic?
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Old 31st October 2012, 02:17 AM   #6
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Well, thats often an issue to take in consideration.
But, lets say the following stages are a power stage in the amp, we often can regard on the fact that this stage has a current-amplification about 30-50 times.

This gives a theoretical current through the drivertransistors up to about 20-35mA per Ampere the amplifier is to deliver to the speakers.

5Amp in a 8Ohm speaker would mean it would function in an amp up to 200W. Nice.

I have some better replacements, MJ15028/MJ15029
Actually a very good transistor.
Have used it as replacement for the MPSU05/MPSU56 in Tandberg amplifiers.
Also for theese weird drivers in TR2075/2080
Should be good for any other amps too.

Note, different housing and pinout.
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Old 31st October 2012, 02:26 AM   #7
wahab is offline wahab  Algeria
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Quote:
Originally Posted by TANDBERGEREN View Post

This gives a theoretical current through the drivertransistors up to about 20-35mA per Ampere the amplifier is to deliver to the speakers.

5Amp in a 8Ohm speaker would mean it would function in an amp up to 200W. Nice.
And even nicer when you think that he s talking of an amp
that use power mosfets...

At worst they drive the mosfets gates with no more than 5 to 15mA
quiescent current..
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Old 31st October 2012, 04:12 AM   #8
Einric is offline Einric  United States
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Well I will be heading over tomorrow to haggle with the guy for it.
He wants $75 USD for it but he has had no serious interest in almost a year.
Even at $75 it's a STEAL if I can make the one dead channel come back to life.
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Old 31st October 2012, 08:35 AM   #9
djk is offline djk
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Don't forget the 2sa1381/2sc3503 have a different pin-out and the leads are thicker than the holes in the circuit board.

The MPSU10/U60 are rated at 1W at 25C, the MPSW42/W92 are also rated at 1W at 25C. They also have the correct pin-out. fT is 50Mhz and Ccb is 3pF vs 60Mhz and 8pF on the MPSU10/U60 parts. The fT peaks at 130Mhz at 10mA on the 42/92 part, right about the current that they operate at in an amplifier.
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Old 2nd November 2012, 01:18 AM   #10
Einric is offline Einric  United States
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!!!!Alright!!!! Got it for $50 and both amplifier channels work.
I'm still diagnosing the "Preamp" board now.
It looks like the RCA on the right channel was shorted to ground and I will be replacing them tomorrow.

I swapped the left channel drive output between the right amplifier board and the left one.
Both channels work!
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