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Push pull amp-Replacing NPN with a non-complementary transistor (output stage)
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Topic: Push pull amp-Replacing NPN with a non-complementary transistor (output stage) (Read 613 times)
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Yamin
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Push pull amp-Replacing NPN with a non-complementary transistor (output stage)
«
on:
August 20, 2020, 07:50:37 pm »
I am working on an Onkyo hifi amplifier which has got a shorted channel. One of the final stage NPN transistor is shorted. I have ordered the spares but was wondering if it would be ok to replace it with a non-complementary transistor to its PNP buddy? The shorted NPN is C5198 and the PNP is A1941 (those are complementary pair). I am thinking of replacing it with a 2SC4468 its just for the time being till the spares arrive - I know I could just leave that channel but do need it.
Thanks in advance.
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Yamin
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Re: Push pull amp-Replacing NPN with a non-complementary transistor (output stage)
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Reply #1 on:
August 20, 2020, 08:15:52 pm »
I also want to add the PNP A1941 seems to check out ok measured in circuit. I have ordered replacement as well, would it be a good idea to keep the current 1941 in for the time being of course?
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Mr Evil
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Re: Push pull amp-Replacing NPN with a non-complementary transistor (output stage)
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Reply #2 on:
August 21, 2020, 11:35:59 am »
From the datasheets, they look similar enough that I would expect it to work with a 2SC4468 instead. The 2SC4468 has lower ft (20 vs 30MHz), so be careful to check that the amp is still stable.
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David Hess
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Re: Push pull amp-Replacing NPN with a non-complementary transistor (output stage)
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Reply #3 on:
August 22, 2020, 04:28:14 pm »
Yes, it is very feasible to use a replacement which is not the complementary part as long as the performance is roughly the same. Distortion *might* be higher but not significantly so.
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