Looking for transistor 2SC4370

Aug 09, 2012 2 Replies
R

Hello,



I'm trying to repair a high-power audio amplifier (a Samson SX 1200) with one blown end stage. I have all the necessary parts, except one: a 2SC4370 transistor. In the Netherlands, I can't obtain this particular type, or an equivalent type (e.g. 2SC4159), and now I'm a bit stuck.



It's a transistor for medium high voltages (150V) in an isolated TO220 housing -- so far, no problem -- but I found that it has also a rather high Hfe (100 typical) and fc (100MHz), and that combination is a bit tricky to come by. Apart from this, in my experience it's best to use original types in audio power stages in any case.



Does anyone know where I can buy one or two of these devices, preferably using PayPal? If someone has one of these lying around and is willing to put it in the mail, I'd be happy to pay you for your trouble.



Thanks in advance, best regards,



Richard Rasker


http://www.linetec.nl
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Using Opera's revolutionary e-mail client: http://www.opera.com/mail/
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R

OK, thanks -- I got me a couple of these and replaced all parts that seemed broken or suspect (as in: all power transistors, and a dozen or so resistors). Alas, there's still more amiss in this amp, as the positive phase of a low-power sine wave shows some HF artefacts which I know are a precursor to full-blown oscillation at higher power levels (resulting in once again a fully blown end stage if I'm not careful). So it's back to picking it apart again, and doing some more detectoring ...

But thanks again for the information, best regards,

Richard Rasker

http://www.linetec.nl
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