2SC3281 2SA1302 Schematic - diyAudio
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Old 3rd June 2002, 06:33 PM   #1
jleaman is offline jleaman  Belgium
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Default 2SC3281 2SA1302 Schematic

Does any one have a simple schematic for these transisters i have about 20 of each from some old inkel amps. im looking for a small amp desight to mabey use these devices im sick of them sitting on the boards and taking up room in my room ill sell the amps to any one that wants the parts it has a 1kv power transformer in them 1 per amp so i have 2 if you need specs please let me know. i also have 4 of 2SA1494 - 2SC3858 matched pairs

the 2sc3281 and 2sa1302 work with each other..any one... : O ) Jason
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Old 3rd June 2002, 06:41 PM   #2
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http://sound.westhost.com/project3a.htm

Do a search on 'Elliot' and you will find much discussion
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Old 2nd April 2004, 07:41 PM   #3
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Default 2SA1302 2SC3281 usage

One amp that uses the 1302 and 3281 is luxman M02, looking for the drawings myself actually. Want to sell me a few pairs? I have been too greedy to feed the amp a 1kHz block wave to test its performance then an output pair was blown... then my replacement turned to be a bad one from Wingshing.
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Old 5th April 2004, 02:29 PM   #4
audioPT is offline audioPT  Portugal
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Are they original TOSHIBA's?

I have a lot of them in the garbage

I've buyed them for 1,55 (pair) and no one work!

Rod Elliot also have some words about this here
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Old 6th April 2004, 08:00 PM   #5
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Default 2SA1302 2SC3281 usage

The SA one sold as Toshiba equivalent (I paid 6 at my local dealer's), same package only black instead of green, was manufactured by Wingshing as the stamp says. They do not publish their component's data as far as I know. After blowing it up instantly I cracked both cases and saw a dye size four times smaller than the original. 15 amps? I don't think so. Some people talk about new producing techniques but I think original chip = original chip so => fake transistor. Any more experiences?
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Old 7th April 2004, 12:49 PM   #6
2002tii is online now 2002tii  Norway
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Older Electrocompaniet amplifiers (AW100, AW120 and ECI-1) also used the transistor pair 2SA1302/2SC3281.
Probably the AW180 also.
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Old 7th April 2004, 01:08 PM   #7
gmarsh is offline gmarsh  Canada
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The Randy Slone "11.4" (from his amp construction manual book) uses these parts, and sounds extremely good. It's fairly simple in design too, but that depends on what your definition of a "simple" circuit is.

I use this amp design for most of my listening, although I'm using different BJTs on the output. From what I've read, the 3281/1302 are difficult to buy without running into fakes, so I went with newer On Semi parts instead.

If these are genuine parts, you'll have no trouble selling 'em.
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Old 7th April 2004, 01:21 PM   #8
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Default Re: 2SA1302 2SC3281 usage

Quote:
Originally posted by Mrweenie
One amp that uses the 1302 and 3281 is luxman M02, looking for the drawings myself actually. Want to sell me a few pairs? .
I have some MJL1302/3281 in excess, I would gladly trade them with other components if you want (and still need them).

Cheers

Andrea
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Old 9th April 2004, 05:06 AM   #9
tcpip is offline tcpip  India
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Quote:
Originally posted by gmarsh
I use this amp design for most of my listening, although I'm using different BJTs on the output. From what I've read, the 3281/1302 are difficult to buy without running into fakes, so I went with newer On Semi parts instead.
Just curious.... which OPS devices are you using? Did you face any stability problems with them? I'm particularly keen to know whether anyone's used the 1943/5200 pair with this amp. This pair of devices is in production and can be safely purchased from Digikey etc, so it would be very good if one could use it with this amp. From all accounts, this is one hell of an amp.

Of course, there's always the alternative of using 15003/4 pair from OnSemi... Randy himself recommends them as an alternative in his book.
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Old 9th April 2004, 08:20 AM   #10
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Using OnSemi MJ21193/94s in my Leach amp and appears
to work just fine.

OnSemi has the same silicon in plastic packages; not as
much dissipation or SOA but there are a number of choices.

I would expect most any amplifier designed for bipolar
transistors would work with the transistors we've discussed
so far. Just watch out for bogus parts! Less likely to
have that problem with the more recent devices on the
market.

Recommend getting both Doug Self's and Randy Sloan's
books on audio power amplifier design to get an overview
of design possibilities.
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