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Old 7th January 2007, 04:18 AM   #1
Gigapod is offline Gigapod  France
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Default Easy to find, inexpensive audio power transistors (BJT and FET)?

Can the amplifier gurus at large here suggest a few complementary power output transistors that are:
- General purpose.
- Easy to find, with various suppliers or possibly with equivalences.
- Inexpensive.
- Modern (will still be around five years from now).

Thank you very much for your contributions.
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Old 8th January 2007, 02:32 AM   #2
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What is your idea of expensive?
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Old 8th January 2007, 04:16 AM   #3
wputera is offline wputera  Indonesia
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How about panasonic's 2SK1104 and 2 SJ164?
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Old 8th January 2007, 05:36 AM   #4
lineup is offline lineup  Sweden
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Thumbs up OnSemi MJL21193 & MJL21194 Audio Power Transistors

.
Audio Power Output Transistors:

MJL21193 and MJL21194

or
MJ21193 and MJ21194

Quote:
My driver stage uses MJE15030 (PNP) and MJE15031 (NPN) which are available in the TO220 case style.

For the output stage, I substituted MJ21193 and MJ21194 which come in the TO3 case style.
The same parts, but with slightly lower Pdiss,
are also available in the TO264 package with part numbers MJL21193 / MJL21194;
these should be easier to mount to a heatsink if that is important to you.
Audio Projects
Hiraga "Classe A" Amplifier

.
Click the image to open in full size.


Quote:
MJL21193, MJL21194
Preferred Device
Silicon Power Transistors
The MJL21193 and MJL21194 utilize Perforated Emitter
technology and
are specifically designed for high power audio output,
disk head positioners and linear applications.

Datasheet - OnSemi MJL21193 & MJL21194
.

Lineup Audio Labs
lineup
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Old 8th January 2007, 05:52 AM   #5
lineup is offline lineup  Sweden
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Default Re: Easy to find, inexpensive audio power transistors (BJT and FET)?

Quote:
Originally posted by Gigapod

- Inexpensive.
.
Quote:
Originally posted by XEAGLEKEEPER

What is your idea of expensive?
.
Gigapod and XEAGLE.

If you are to build a normal power amplifier
then Output Power Transistors are not a very high % of cost.
Not even when using really top class devices ( which I think we should and can afford ).

In my experience,
The big costs in a Power Amplifier are:
- Chassis
- Transformer + eventually Big Filter electrolytic caps
- Heatsink


If you can put this or that much money,
just to make your amplifier chassis outside look nice, almost perfect,
at the images you will post here at www.diyaudio.com
.. then you can afford to make the output stage have very fine transistors, too.


Anyone that really did count the total cost of a DIY Amplifier
will see that this is true, with a few exceptions, of course.
( For example using recycled chassis from defect old amplifiers
can give you nice amplifiers chassis. )


lineup
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Old 8th January 2007, 09:48 AM   #6
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Lineup
My question was for gigapod. When I build a project I generally get the best for the application reguardless of cost. My idea of expensive and his Idea are probably way different.
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Old 8th January 2007, 10:41 AM   #7
lineup is offline lineup  Sweden
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Quote:
Originally posted by XEAGLEKEEPER
Lineup
My question was for gigapod.
My answer was more for friend Gigapod.
I just added your quote, because it was a part of the context in this topic.

So XEAGLEKEEPER,
you have any good Power Output recommendations?
BJT or MOS doesn't matter - as he wants both
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Old 8th January 2007, 12:56 PM   #8
Gigapod is offline Gigapod  France
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Quote:
Originally posted by XEAGLEKEEPER
What is your idea of expensive?
Hi XEAGLEKEEPER,
TIP3055 + TIP2955 = 3euros ($3.75) (retail) inexpensive,

SAPM01P + N = 22 euros ($29) (retail) expensive.

Something good in between?

Thanks,
G.
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Old 8th January 2007, 12:59 PM   #9
Gigapod is offline Gigapod  France
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Quote:
Originally posted by wputera
How about panasonic's 2SK1104 and 2 SJ164?
Hi wputera,

These are not available at my usual supplier. How much do you usually get them for and why do you recommend them?

Thanks,
G.
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Old 8th January 2007, 01:07 PM   #10
Gigapod is offline Gigapod  France
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Default Re: Re: Easy to find, inexpensive audio power transistors (BJT and FET)?

Quote:
Originally posted by lineup

...
If you are to build a normal power amplifier
then Output Power Transistors are not a very high % of cost.
...

lineup
Hi lineup,

You are right, I agree very much. I was just asking because I want to try a few amplifier prototypes and I am afraid I'll pretty much destroy the power transistors.
So I wanted something not too expensive to dest... experiment with.

You mention the MJE15030 and MJE15031 in TO220 package. I can get these for 3 euros / pair. Is that inexpensive or not? Are they any good for experimenting? Better than TIP3055/TIP2955?

Thanks for your input (and patience),
G.
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