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Old 3rd September 2003, 11:16 AM   #1
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Default Equivalent of transistors for http://www.borbelyaudio.com

I am interesting in a few schemes at this site: http://www.borbelyaudio.com .What sort of widespread transistors I can apply instead of J74BL, J79, J103, J148, K216, K246, K982 ?
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Old 3rd September 2003, 02:06 PM   #2
AuroraB is offline AuroraB  Norway
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J74=2SJ74,- typical shorthand notation of japanese transistors leaves out the 2S- in front...
All the transistors you mention should be easily available, at least in western europe...
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Old 3rd September 2003, 02:13 PM   #3
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Old 3rd September 2003, 09:25 PM   #4
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Please don't waste your time trying to change the parts. They are not easily second sourced. Buy them from Borbely. They will be relatively expensive, but you are in no position to find them much cheaper. In fact, just get a 'kit' from Borbely, and don't waste your time trying to make it on the cheap. You will pay more, in the long run.
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Old 4th September 2003, 07:04 AM   #5
UrSv is offline UrSv  Sweden
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Quote:
Originally posted by john curl
Please don't waste your time trying to change the parts. They are not easily second sourced. Buy them from Borbely. They will be relatively expensive, but you are in no position to find them much cheaper. In fact, just get a 'kit' from Borbely, and don't waste your time trying to make it on the cheap. You will pay more, in the long run.
Why would it be so hard to find them cheaper? Borbely is anything from twice to 5 times the price of other sources.
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Old 4th September 2003, 07:17 AM   #6
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Thanks all, especial AuroraB.
J=2sJ , K=2sk
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Old 5th September 2003, 10:03 PM   #7
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AlexO, I did not note previously, that you live in Moscow. I understand now that the cost of these components is very high, especially from Erno, with the rate-of-exchange. I was trying to save others, who might live in Germany or many other places in Western Europe, to not waste their time trying to save a few Euros, but I will tell you the whole situation, in order to help you further.
We have used these devices, that Erno Borbely designs with, and sells, for many years. Once, I had 3000 2SJ79's in my possession along with the complement, the 2SK 216 (I think) . They were burned up in a firestorm, but if I had them today, I could sell them and buy a Porsche with the money. What used to cost 1 euro each, 20 years ago, now may now sell for many, many times more. When you are trying to buy just one to 5 parts, the cost of your purchase is always high, because of the handling cost for the distributor. After all, 1 piece, or 100, or 1000 pieces takes the same processing time. If you can find a cheap distributor, then you will have had better luck than I have, over the years. Give it a try, if you want.
Second, these devices are SOTA, which means the best available, like Porsche or Mercedes. These parts will always cost more than a near equivalent part that is not quite so unique. I cannot personally recommend other parts, because I do not use them, but there are somewhat similar parts available at a reasonable price.
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Old 10th September 2003, 08:15 AM   #8
bocka is offline bocka  Germany
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Hi John, a Porsche or Mercedes seems to be very cheap in the States. The J79/K216 costs EUR 1,80 in Germany in quantities of 1000. For only $10000 a Porsche, not bad

You can get them also from Farnell, but the price is higher. Many parts you can get also from Heho if you are confirm with the German language.
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Old 11th September 2003, 01:54 AM   #9
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You missed a digit on the price of a Porsche in the USA. ;-) If you can get these semis cheap in any other country, in small quantities, go for it.
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Old 11th September 2003, 05:04 PM   #10
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Default Hitachi/RENESAS

http://www.ceitron.com/semi/semi.phtml?part=j79

http://www.ceitron.com/semi/semi.phtml?part=K216
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