Replacement Transistor for Leak delta 30

renjiish · 18th August 2008, 08:58 AM

Can anybody recommend modern equivalents for BC117 and BC 143 transistors please?

Mooly · 18th August 2008, 11:54 AM

2n5551 should be OK for the BC117. As for the BC143, you are going to have to use a different package if you want more modern. MJE350 perhaps but thats only 500 ma IC. The BC143 is listed as 1 amp. Is it not one of a complementary pair of drivers.
It's a case of whats available rather than what you want

Leolabs · 18th August 2008, 01:43 PM

BC117-BF257,BF297

BC143-BC161,BC461

Bone · 18th August 2008, 02:08 PM

Looks like you've blown one power channel.

If only one driver has gone, i.e. T9 - BC143, I'd replace both as you are not going to get a good complementary match with one of the alternatives given above. I would replace both with either BD139/140 pair or the
MJE 340/350 pair.

Alternatively if you've got the version with 2N3055 outputs, use 2N3053 (NPN) and 2N4037 as drivers which are from the same (RCA) family.

Regards Tony.

18th August 2008, 08:58 AM	#1
renjiish diyAudio Member Join Date: Aug 2002 Location: United Kingdom	Replacement Transistor for Leak delta 30 Can anybody recommend modern equivalents for BC117 and BC 143 transistors please?

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18th August 2008, 11:54 AM	#2
Mooly diyAudio Moderator Join Date: Sep 2007	2n5551 should be OK for the BC117. As for the BC143, you are going to have to use a different package if you want more modern. MJE350 perhaps but thats only 500 ma IC. The BC143 is listed as 1 amp. Is it not one of a complementary pair of drivers. It's a case of whats available rather than what you want

18th August 2008, 01:43 PM	#3
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	BC117-BF257,BF297 BC143-BC161,BC461

18th August 2008, 02:08 PM	#4
Bone diyAudio Member Join Date: Jun 2004 Location: Dorset, UK	Looks like you've blown one power channel. If only one driver has gone, i.e. T9 - BC143, I'd replace both as you are not going to get a good complementary match with one of the alternatives given above. I would replace both with either BD139/140 pair or the MJE 340/350 pair. Alternatively if you've got the version with 2N3055 outputs, use 2N3053 (NPN) and 2N4037 as drivers which are from the same (RCA) family. Regards Tony.