BC142/143 transistor replacement - diyAudio
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Old 10th June 2012, 09:54 AM   #1
tomst is offline tomst  United Kingdom
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Default BC142/143 transistor replacement

Hi
I have a leak Stereo 30 plus and have just burned up a BC142 (T8 on the diagram) drive transistor due to a worn out trim pot. The mentioned transistors are getting quite difficult to find. Does anyone have any ides as to a good replacement for both. The output transistor on this amp is is the RCA16006 (same as 2n3055 i believe)
thanks
Tom
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Old 10th June 2012, 10:10 AM   #2
AndrewT is offline AndrewT  Scotland
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do you have data for the 142/143?
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Old 10th June 2012, 10:12 AM   #3
tomst is offline tomst  United Kingdom
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Sorry circuit diagram here
Attached Files
File Type: zip cctStereo30Plus.zip (220.6 KB, 30 views)
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Old 10th June 2012, 10:19 AM   #4
tomst is offline tomst  United Kingdom
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Does this help
Attached Files
File Type: pdf BC142datasheet.pdf (76.6 KB, 22 views)
File Type: pdf BC143.pdf (95.9 KB, 6 views)
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Old 10th June 2012, 10:27 AM   #5
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BC142 can be substituted by BC141 available from Cricklewood Electronics.

Or you can get the BC142 from http://www.littlediode.com/component...rch_redirect=Y
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Old 10th June 2012, 10:32 AM   #6
AndrewT is offline AndrewT  Scotland
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5W, 50Vce0, 1A, 12pF, 20MHz
Many To126 could do this job.
All To126 are ecb pin out.
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Old 10th June 2012, 10:41 AM   #7
Spiny is offline Spiny  United Kingdom
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try ebay uk, there are a few of each about, seems the 143 is the difficult one, futurlec have the 142.

May be worth asking cricklewoodelectronics They often seem to be able to source unusual transistors.
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Old 10th June 2012, 10:51 AM   #8
tomst is offline tomst  United Kingdom
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Thanks for the replies.
The little Diode company has both the 142 and 143.
Should i just use these again or would it be better to use something different?
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Old 10th June 2012, 10:54 AM   #9
AndrewT is offline AndrewT  Scotland
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If you can get heatsinks for the top hat style case then buy the same.
This will reduce operating temperature and may result in a more robust driver that does not burn out.
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Old 10th June 2012, 11:10 AM   #10
wahab is offline wahab  Algeria
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Quote:
Originally Posted by AndrewT View Post
20MHz
Many To126 could do this job.
All To126 are ecb pin out.
Not all TO126 suit the purpose since Hfe is 5 typical at 20Mhz , that s about a 100Mhz Ft , so a replacement should be fast enough , BD139/140 pair will do it perfectly although the output pair is so slow that 20Mhz Ft devices should work flawlessly , but one never knows.....
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