Looking for transistor 2SC4370

[Richard Rasker]

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

 

[Joss Goodey]

On Thu, 09 Aug 2012 15:40:12 +0100, Richard Rasker <spamtrap@linetec.nl>
wrote:

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.nikko-electronics.co.uk have them in stock at Ł1.09.
--
Using Opera's revolutionary e-mail client: http://www.opera.com/mail/

 

[Richard Rasker]

Joss Goodey wrote:

On Thu, 09 Aug 2012 15:40:12 +0100, Richard Rasker <spamtrap@linetec.nl
wrote:

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.nikko-electronics.co.uk have them in stock at ÂŁ1.09.

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