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Sansui AU-D11 =restoring=

B

black13ua

New Member
Few days ago i bought Sansui AU-D11 in "not working" state.
After i get it and open i don't believe my eyes - all 4 power transistors is Sanken 2SC3264! And more ... 2 of them is damaged (0 ohms resistant)
So my question - what transistors the best choice for this AMP as power transistor? And what i must check for understand what else damaged?

P.S. Please, forgive me for my english :)
 
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Well no wonder 2 of them are toast.

The 2SA1494/2SC3858 complementary pair are perfect replacements for the original 2SA1170/2SC2774.
 
You check output transistors, or transistors in general, with the 'diode test' setting, not ohms. What is your history in electronics or kit building?

The question is what failed and took out the two outputs? This is an amp best repaired by an expert IMHO.

Scott T.
 
scottrt said:
You check output transistors, or transistors in general, with the 'diode test' setting, not ohms. What is your history in electronics or kit building?

The question is what failed and took out the two outputs? This is an amp best repaired by an expert IMHO.

Scott T.
Click to expand...

noooop. !

The OHM function can also be sue to check out transistor..

what did people use in the Analog meter in the old day to check transistor or diode...

OHM setting my friend...
 
You check output transistors, or transistors in general, with the 'diode test' setting, not ohms. What is your history in electronics or kit building?

The question is what failed and took out the two outputs? This is an amp best repaired by an expert IMHO.

Learned something new....
http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/trantest.html

Scott T.
 

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scottrt said:
You check output transistors, or transistors in general, with the 'diode test' setting, not ohms. What is your history in electronics or kit building?

The question is what failed and took out the two outputs? This is an amp best repaired by an expert IMHO.

Learned something new....
http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/trantest.html

Scott T.
Click to expand...

Transistors like this pic
in my amp - all 4 is 2SC3264 :)
OK i buy new 4 transistors 2SA1494/2SC3858 and set in his place.
What else i must check?
 
scottrt said:
You check output transistors, or transistors in general, with the 'diode test' setting, not ohms. What is your history in electronics or kit building?

The question is what failed and took out the two outputs? This is an amp best repaired by an expert IMHO.

Scott T.
Click to expand...

look like more than previous amp's user :)
 
The fact that someone obviously without a clue, or just enough of one to be dangerous, has been tinkering makes this even more difficult than normal. You appear to be inexperienced yourself considering. This might not be the best situation for a greenhorn. If you really are determined in having a go at this you will have to check everything and assume nothing.
 
black13ua said:
Transistors like this pic
in my amp - all 4 is 2SC3264 :)
OK i buy new 4 transistors 2SA1494/2SC3858 and set in his place.
What else i must check?
Click to expand...

All the driver transistors (remove them & test) - and build yourself a 'Dim Bulb Tester' :yes:

scottrt said:
The question is what failed and took out the two outputs? This is an amp best repaired by an expert IMHO.

Scott T.
Click to expand...

This is very true.
 
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black13ua said:
Where is the best place to buy original transistors in Europe?
Click to expand...

If it must be in Europe try here:

http://www.littlediode.com/product.php?productid=80685
http://www.littlediode.com/product.php?productid=81201

And not in Europe, but this looks like a good bet:

http://ampslab.com/trans_2sa1494.htm

You need to fully understand that it is not as simple as putting in a new set of output transistors, you also need to have good electronics knowledge and some basic equipment.
 
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Hyperion said:
If it must be in Europe try here:

http://www.littlediode.com/product.php?productid=80685
http://www.littlediode.com/product.php?productid=81201

And not in Europe, but this looks like a good bet:

http://ampslab.com/trans_2sa1494.htm

You need to fully understand that it is not as simple as putting in a new set of output transistors, you also need to have good electronics knowledge and some basic equipment.
Click to expand...
Thanks for shops
I recaping my main AMP Sansui BA-2000, and this job i like.
I sure, we can repair my amp very well, if will be together ;-)
 
I want buy all small transistors first to start any work with amp
What the best choice for replace this transistors:
2SC1845
2SA992
2SC1904
2SA899
2SC2238
2SA968
2SC2774
2SA1170
also i want to buy all electrolytic caps up to 1000uF and replace them.
 
2SC1845 now can buy on ebay ( NEC )
2SA992 - now can buy on ebay
2SC1904 - KSC2690AYS (mouser.com)
2SA899 - KSA1220AYS (mouser.com)
2SC2238 - can replace by 2SC2591
2SA968 - can replace by 2SA1111
2SC2774/2SA1170 - can replace by 2SA1170/2SC2774, 2SA1216/2SC2922, 2SA1494/2SC3858, NTE59/NTE58 (thanks RocknRoll AK member)
 
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black13ua said:
2SC1845 now can buy on ebay ( NEC )
2SA992 - now can buy on ebay
2SC1904 - KSC2690AYS (mouser.com)
2SA899 - KSA1220AYS (mouser.com)
2SC2238 - ????
2SA968 - ????
2SC2774/2SA1170 - can replace by 2SA1170/2SC2774, 2SA1216/2SC2922, 2SA1494/2SC3858, NTE59/NTE58 (thanks RocknRoll AK member)
Click to expand...

I wouldnt recommend buying semiconductors on ebay, I personally wouldnt buy any NTE components either..
2SA968 = MJE15033
2SC2238 = MJE15032 both available from mouser......
 
kevzep said:
I wouldnt recommend buying semiconductors on ebay, I personally wouldnt buy any NTE components either..
2SA968 = MJE15033
2SC2238 = MJE15032 both available from mouser......
Click to expand...

I know, thats not good idea to buy electrocomponents on ebay
Then question, what modern transistors the best choise for replace 2SC1845/2SA992?
 
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