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Old 5th May 2003, 05:41 PM   #11
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ON Semiconductor (Spun off from Motorola a few years ago) srill has some MJL 1302As and MJL 3281As. Send away for samples- they're cheaper.
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Old 5th May 2003, 07:12 PM   #12
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I have used both the SA1302 $SC3281, yes they're original part since I bought them at least 5-7 years backand still have a whole bunch of them, fromToshiba and the MJL Series from Motorola. I think the MJL are even better than the Toshiba, more linear. I have tried both in the same circuit and the MJL sound much better. Check MCM electronics, I believe they still have the SA and SC series from Toshiba. For the MJL series, I got them from Newark Electronics. Pricewise, they're about the same but I would prefer MJL over the Toshiba. Hope it helps.
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Old 5th May 2003, 07:15 PM   #13
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you could buy them from parts express. These are not fake and I have used them. SA1302 is for $3.85 and 2SC3281 is $2.95. Check them @ www.partsexpress.com.
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Old 6th May 2003, 02:46 AM   #14
Diode is offline Diode  United States
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What about MJL21193 and MJL21194? I can't seem to locate them without buying a tube of 25 pcs. Any Ideas?

Thanks in advance,

Chris
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Old 6th May 2003, 02:54 AM   #15
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Default 2SA & 2SC -v- MJLs

I have to agree with Mylienho. The MJLs from ON are better than the 2SCs or 2SAs. Having tested a complete matched set of both in the same amplifier (6 NPNs and 6 PNPs per cahnnel), the MJLs just sounded better. Music seemed to jump out at me , while it was rather flat with the Toshiba units.

This is not to disparage Toshiba, or call into question their authenticity. But in my subjective opinion, in an A/B test with the output devices being the only variable, my money (or time, since they WERE samples) is with the ON units. My $ 0.02 worth
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Old 6th May 2003, 03:02 AM   #16
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Diode,

The 1302s and the 3281s are still available from ON as samples, or if you want to pay for them, go through Future/Active. Both are still available for $2.88 each.

You USED to be able to order them from Active's store here in Livonia (Detroit), but, and this is no lie, Active's HQ called them one morning at 11:30 am and told the mgr (I used to work there and still knew him) to usher any customers out and lock the door. Store Closed- end of story.
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Old 6th May 2003, 03:08 AM   #17
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clarification: the $2.88 price is from ON's website, not Future's. I still would do the samples thing. Still cheaper. If you need a set, let me know, and I will "order" them and ship them 2 U after I receive them.
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Old 6th May 2003, 03:32 AM   #18
tcpip is offline tcpip  India
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Default 2SA1302/2SC3281 available at digikey.com

I just checked www.digikey.com; these transistors
are available. In quantities of 10, they are less
than USD 2.00 each. (I was planning to build
more than 2 channels, so I thought 10 seemed
like a good minimum quantity.)

They also stock the newer 2SA1943/2SC5200. I
in fact bought them instead of the older models.
I've decided to risk it and blindly use the newer
transistors wherever the old ones have been
recommended, and see whether the higher Ft
of the newer models cause any problems. (Will
the compensation capacitor value need to be
changed, do you think, in most power amps?)

And I think the jury is still out on the issue of
matching of OPS power transistors. Is it necessary?
Randy Slone (sealelectronics.com) does not
seem to think it is, and I'm going to go by his
research on this one.

Tarun
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Old 6th May 2003, 03:41 AM   #19
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Default Imports?

Hi Tarun,
Did you buy your parts through someone in the US and have it carried over or did you order via the web ?
If you did order via the web ( Credit card) what were you charged by the Indian customs. Any idea if there are any value limits here in India for personal imports ?
Thanks.
Ashok.
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Old 7th May 2003, 02:22 PM   #20
saurus is offline saurus  United States
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Rod Elliot told me in an email that he doesn't bother to match transistors for the P3A because, as he said, the distortion on that amp is so low anyway. I went ahead and built his transistor matching circuit and did my best to match up the few transistors I had just because it was fun to do.
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