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Old 18th August 2008, 08:58 AM   #1
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Default Replacement Transistor for Leak delta 30

Can anybody recommend modern equivalents for BC117 and BC 143 transistors please?
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Old 18th August 2008, 11:54 AM   #2
Mooly is offline Mooly  United Kingdom
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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
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Old 18th August 2008, 01:43 PM   #3
Leolabs is offline Leolabs  Malaysia
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Old 18th August 2008, 02:08 PM   #4
Bone is offline Bone  United Kingdom
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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.
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