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renjiish 18th August 2008 08:58 AM

Replacement Transistor for Leak delta 30
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



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.

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