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Old 10th October 2003, 03:48 AM   #1
OliverD is offline OliverD  Germany
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Default Toshiba Audio Transistors Group Buy

Hi everyone,

I'll be designing and building a new series of high quality PA amplifiers soon, and I need to order some transistors for prototyping. To break the minimum order limit and to get resonable prices, I'd like to ask anyone interested to join a group buy.

I decided to use:

2SA1837 / S2SC4793 for driver stage
2SA1943-O / 2SC5200-O for output stage

Find the datasheets here:

http://www.prosounds.de/2SA1837.pdf
http://www.prosounds.de/2SC4793.pdf
http://www.prosounds.de/2SA1943.pdf
http://www.prosounds.de/2SC5200.pdf

And here's the Toshiba Power Transistors Product Guide:

http://www.prosounds.de/toshguide.pdf

Scroll down to page 8.

The 2SA1943 and 2SC5200 are listed as direct replacement of the old 2SA1302 and 2SC3281 btw, which were highly regarded and widely used in high end amplifiers. They are now out of production and fakes are being distributed all over the world. But who cares if you can get the improved version?

Short data of output devices: TOP-3P(L) case, 150W, 230V, 15A, 30MHz, hfe=80..160.
Short data of driver stage devices: 20W, 230V, 1A, 70MHz, hfe=100..320, isolated TO-220 case, easy mounting on heatsink.

I'll be ordering directly from a Toshiba distributor, so we will get genuine, ranked devices. Searching my usual suppliers, I found no price below 3.20 for the output devices and no price below 1.00 for the drivers. If enough people join in, we'll get the following conditions:

2SA1837: 0.47 / piece incl. VAT
2SC4793: 0.47 / piece incl. VAT
2SA1943-O: 1.96 / piece incl. VAT
2SC5200-O: 2.17 / piece incl. VAT

excl. package, shipping, duties, etc.

Please also consider moving away from your current favourite BJT power transistors as these are top end parts for a very good price.

If you are interested, post how many you'd want to buy and we will see if it's sufficient to break the minimum order limit.

Please understand that I limit my order to these four devices.

Regards, AMT-freak
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Old 13th October 2003, 12:22 PM   #2
OliverD is offline OliverD  Germany
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Noone interesed?
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Old 13th October 2003, 01:01 PM   #3
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Hi AMT-Freak,

Can you tell me just when the deadline is?
I'm kinda, bussy right now with a few other things (e.g. my health).

Thanks.

Best regards,


Audiofanatic
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Old 13th October 2003, 05:20 PM   #4
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AMT-freak,

I am interested if we get the prices you quoted. I couldn't mail
you though. You seem not to allow mailing from this forum.
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Old 13th October 2003, 06:19 PM   #5
OliverD is offline OliverD  Germany
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Hi Audiofanatic, hi Christer,

thank you for your interest. Best wishes for your health. A beautiful recording played back on a good system might help

There is no fixed deadline, although I'd like to buy asap (meaning as soon as enough people join in). I asked the distributor to make an offer and these are the prices they quoted. The offer was valid 14 days (they are over), but I don't expect prices to vary that much.

Lead times are high anyway and I have to check their stock right before I order.

Minimum order is 250 Euros net. Minimum quantities are 25 pieces each for the big ones and 50 pieces each for the drivers.

Email button should be enabled now. Hell, why does it disable itself all the time!
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Old 13th October 2003, 06:35 PM   #6
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Do you accept paypal and how much will shipping to the netherlands be? (i need just a small quantity)
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Old 13th October 2003, 07:07 PM   #7
OliverD is offline OliverD  Germany
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Paypal in fact is the only payment method I accept (after having lost lots of money in former group buys due to ridiculously high bank fees).

Shipping to the Netherlands won't be expensive if the package is light, a couple Euros.

How many can you use?
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Old 13th October 2003, 08:06 PM   #8
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Would cash be OK as an alternative to paypal?
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Old 13th October 2003, 09:21 PM   #9
OliverD is offline OliverD  Germany
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It would, provided you are willing to pay the extra cost for registered mail. I don't feel exactly comfortable telling people their cash hasn't arrived with no means of proving it. (Happened at least two times this year.)
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Old 13th October 2003, 09:47 PM   #10
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Actually, I had thought about just sending it unregistered and
take the risk, but now, if you say that money actually has
disappeared I'd better reconsider. I've never used Paypal,
but I suppose they charge a fee too. I couldn't find any info
about that on their site, but they must make money somewhere.
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