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Old 27th April 2004, 08:59 AM   #1
Kari is offline Kari  Sweden
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Default High grade replacement transistors.

Hi,
can anyone suggest "better"/audio grade transistors for BC550C, BC559C and BD139?

Thx,

Kari
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Old 27th April 2004, 10:07 AM   #2
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BC550C is already the low noise version of BC550 isn't it?
Steve
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Old 27th April 2004, 04:02 PM   #3
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No it's the higher gain band version.

The devices you quote are already good audio devices and staying within the contraints of the packaging I doubt any better can be done.

The only comment I would make is that BC550/560 are a complementary pair, as are the BC549/559. So if you are using the devices listed as complementary pairs you are not using the optimum solution.
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Old 27th April 2004, 04:14 PM   #4
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Kari, you have lot's of types to choose from but all depends of what you are going to use those for and how easy there are to get.

BC5xx (BC8xx SMD) and BD139/140 are good in it's class.

If you state your needs I'm sure we can come up with something.
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Old 27th April 2004, 05:08 PM   #5
Kari is offline Kari  Sweden
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Hi,
i'm in the process of building a discretecomponent setup of ZapFilter2. I'll go for BC560C instead of BC559C. I was just wondering if there where any "audio" marked transistors.

Thx,

Kari
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Old 27th April 2004, 09:09 PM   #6
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These transistors *are* 'audio marked' devices!

You may be able to improve a little on the BD139 with one of the new ONsemi devices, MJE15034. If this is hard to get (very new release) then try its predecessor MJE15032. But beware that these are a TO-220 case and the pinout is reversed.

For small-signal my 'special drawer' has Sanyo 2SA1016 and 2SC2362 in it. But these devices have a totally different pinout to the BC5xx series and are fairly hard to get.

I really don't think you will notice any difference using other than BC550/560 - they are high gain linear devices. Better spend your time and money on something that will make more difference, like bigger/more power supply caps/better regulators.
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