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2SA1302 and 2SC3281
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Old 11th July 2003, 11:20 AM   #21
tcpip is offline tcpip  India
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Location: Mumbai, India
2SA1302 and 2SC3281
Default I carried my stuff in in my personal luggage

Dear Ashok,

Sorry about the delay in replying.

You can order anything from abroad on int'l
ccard, provided you do not exceed the Basic
Travel Quote of forex (which the RBI gives each
citizen per head per year). This quota is, I
believe, USD 5000. Most of us never use any
of it for most of the years of our lives.

I asked Digikey US to ship the transistors to
my friend's place in Singapore. I was expected
to visit him (one of my very rare overseas trips)
and I picked up the packet and brought it in
with my personal luggage. The value of the
items was low enough to let me walk in through
the green channel, so no customs hassles.

On another occasion, I wanted to import a pair
of Jordan speaker drivers. I asked a friendly
neighbourhood hardware dealer to help; they
regularly import small quantities of specialised
hardware. He imported the items for me, got
them shipped in by DHL (the shipping costs
were 33% of the total bill), and then Customs
decided to charge no duty, saying the quantity
was too small; this must be a sample shipment.
Thus, I got them legally imported once again,
and delivered to my door, without any problems.

Hope this helps. I suggest that as a general
rule, pay by int'l ccard, and ask them to ship
to a friend's address who lives abroad, so that
someone coming into the country can carry
it with him. The second preference is to ask
for direct delivery to India. In that case, the
shipping costs will be heavy, and Customs
will definitely ask you to pay duty. Once they
realise this is for personal use and of low
value, they'll ask for some legal duty amt and
release the items without bothering to demand
bribes. On many occasions, if
the item comes in by DHL or some other
big int'l courier, Customs don't even charge
duty, I don't know why. If you ship directly
to India NEVER use any other shipping method
other than int'l couriers. Never use things like
air mail. Each time I've ordered books from
Amazon by air mail, they've got "lost" (Indian
euphemism for stolen by postal employees).

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Old 12th July 2003, 08:07 AM   #22
PMA is offline PMA  Europe
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2SA1302 and 2SC3281

are not the chips inside Toshiba and Motorola the same ones?
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Old 12th July 2003, 04:17 PM   #23
ashok is offline ashok
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2SA1302 and 2SC3281
Default Thanks Tarun.

Hi Tarun,
Thanks for the clarification.
Just before you replied I ordered some stuff , paid by credit card and shipped it to my pals place . This one was in the US but next time I am shipping to Singapore because it is easier to pick up. Note that if you can stay with friends it might be cheaper ( or almost ! ) to fly to Singapore yourself and pick up what you want. From Chennai it is about Rs 17K and from Cal it is even cheaper. Right now Chennai Delhi is more expensive than Chennai Singapore ! Actually it has been this way for several years.

How do the Jordans sound? Did you compare it with anythig else ?

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Old 14th July 2003, 07:17 AM   #24
tcpip is offline tcpip  India
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2SA1302 and 2SC3281
Default The sound of the Jordans

Hi Ashok,

Built a small ported enclosure for each Jordan, based on one of the simple designs published on their Website. So, what with a 5.5" driver and a bookshelf enclosure, one does not expect to hear too much bass.

But after I built the boxes, stuck the speakers in (this was my very first DIY speaker building project with decent drivers) and went through the long break-in period, the sound was surprising.

The bass was weak. (I was comparing this with my Wharfedale Pacific PI-40 floorstanders, so it's no surprise.) But bass guitar in a lot of Western jazz music (including Diana Krall) sounded surprisingly deep; I had been expecting to almost not hear the bass guitars. However, there is an overall lightness in the sound because bass extension is poor. I can't expect anything else from a driver of this size, unless I try the floor-standing TL design on the Jordan Website.

The midrange is amazingly good. It's clearer than my Wharfedales, which are among the best Wharfedales built in recent times. I listen to a lot of Hindustani classical, and it's surprising how there's a discernible difference in clarity and detailing with just voices. It's like that cliche of a veil lifting.

The treble surprised me. There is little treble response. The response graphs of the drivers show the response stretching to 20K, even rising towards the very end. With my boxes, I find that even tape hiss is much less (yes, MUCH less) audible with the Jordans than my Wharfedales. As we know, tape hiss starts at something like 6KHz, so I was not mentally prepared to see a sharp audible difference at that low a frequency. I would think that one would need a tweeter, maybe cutting in at 8K and above, to fill in the upper registers.

Imaging is _lovely_ compared to my Wharfedales. (Reviewers of the Wharfedales have commented on them being a bit weak in the imaging department.) I don't know whether this big plus is due to the small enclosure or the Jordan or both.

Overall, the Jordans sound _lovely_. They give you about the lowest listening fatigue that I've ever heard, and they make you pay attention to the music; they're arresting (and not in a bad, overly detailed kind of way at all). Diana Krall sounds lovely. Sinatra sounds lacking in body. Hindustani classical vocal sounds lovely, both with male and female vocals; string instruments (e.g. Vilayat Khan's CDs) lose their leading edge a bit, but they remain hugely listenable, involving, and fun. Don't try rock; you'll need a 12" reinforcer for bass, I should think. I tried one of my favourites of good hard rock with super-clean recording: Dire Straits. Disappointing. Watching movies with 2-channel sound works beautifully with these speakers if the film does not have much pyrotechnics. If it's "Terminator 2", you need much deeper bass. I switch to the Wharfedales.

I feel my investment in the Jordans was a total success. I will discard the enclosure I built, and build a 3-way. I'll bring in a 12" driver for bass, below 200 Hz or so. I'll add a tweeter for the tape-hiss-and-above frequencies. I'll try open baffle, at least for the Jordan and the tweeter. And then we'll see how it goes. The midrange, the voices, from the Jordan, are absolutely first-rate. And a lot of people on the Speaker forum on this Website seem to have very similar ideas... use an FR driver as the centrepiece (in many ways) for a three ways with reinforcement at only the extremeties. And of course, I'll use active filters with amps from Randy Slone's designs. (That's how I got involved with these 2SA1302, etc. )

I'm also curious about the Tang Band drivers. If they can't handle high volumes, I guess it's possible to afford sets of four physical drivers... they are so inexpensive.

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Old 11th October 2003, 12:28 AM   #25
OliverD is offline OliverD  Germany
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Just in case anyone is looking for good prices on the 2SA1302 and 2SC3281 updates, 2SA1943 and 2SC5200, I'm going to buy a larger quantity as a group buy. I'll also be ordering 2SA1837 and 2SC4793 isolated driver devices.

Plz check here: http://www.diyaudio.com/forums/showt...threadid=21353
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Old 11th October 2003, 03:32 AM   #26
sam9 is offline sam9  United States
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Although I've been using 2SA1943/2SC5200 what I really like about someToshiba 2SA1302/2SC3281 pairs I also bought from digikey is that one on the right is green. (Or on the left it's going into a EF OPS). This may sound silly but as near vision gets a little manky with age it is embarasingly easy to get them wrong way around ojn the PCB!
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Old 12th October 2003, 04:30 AM   #27
TonyTecson is offline TonyTecson  Philippines
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2SA1302 and 2SC3281
Default got 20 pair of drivers

I'll also be ordering 2SA1837 and 2SC4793 isolated driver devices.
how does this compare to the Leach amp drivers, i can get more of this from surplus/junked audio pcb's...
planet10 needs your help: Let's help Ruth and Dave...http://www.diyaudio.com/forums/plane...ml#post5010547[B
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Old 14th October 2003, 02:15 AM   #28
N-Channel is offline N-Channel  United States
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Default MJL3281A & MJL1302A


No, they are not the same chip. A little thing I learned a while ago in the electronics business: One manufacturer's 555 timer is not the same as another's 555 timer. They just subscribe to the same, very narrow set of criteria to be labelled a 555 timer. So while Motorola (excuse me, ON Semiconductor) calls theirs an MC1455, and National calls theirs an LM555, and SIgnetics calls theirs an NE555, they all have minor differeces, even though they all subscribe the "555" specification.

Same analogy holds for the Toshiba 2SC- and 2SA- transistors -v- the Motorola (there I go again! I mean ON Semiconductor) units. While the construction and semiconductor makeup may be different, both manufacturers' units conform to the same "1302" and "3281" criteria, respectively. Hence, the same base numbers of 1302 and 3281.

IMHO, the ON units are much better, as the formerly Motorola (There! I finally got it right!) company has unsurpassed quality control.

Beside, I doubt whether Toshiba will sample their units out. Believe me, try the sampling route- it's cheaper and it REALLY works!

Best of luck, and please let me know how you fare with acquiring these.
-. ---.. -..- ---
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Old 14th October 2003, 10:13 AM   #29
millwood is offline millwood  United States
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Default Re: MJL3281A & MJL1302A

Originally posted by N-Channel

No, they are not the same chip.

so what exactly IS the difference between the Toshiba and OnSemi versions?
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Old 14th October 2003, 11:21 AM   #30
li_gangyi is offline li_gangyi  Singapore
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They are made by different companies...hehe
Kids in the back seat cause accidents...Accidents in the back seat cause kids...
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