Toshiba 2sk370 and 2sj108 - Page 2

Charles Hansen · 28th May 2007, 04:33 PM

You guys are going to a lot of trouble for nothing. The Japanese transistor numbering system is different from the US system. With the Japanese system, the exact same part in a different package is given a different number.

The 2SJ108 is the EXACT SAME PART as the much more readily available 2SJ74.

The 2SK370 is THE EXACT SAME PART as the much more readily available 2SK170.

The only difference is the package. The hard-to-get versions are in a smaller physical package and will only dissipate 200 mW. The easy-to-get versions are in a standard TO-92 package and will dissipate 400 mW.

jacco vermeulen · 13th June 2007, 07:51 AM

Mr Hansen,

nice to see you pop up again, welcome back.
Wishing you a less bumpier ride for at least a decade.

korben69 · 13th June 2007, 11:13 AM

Nice to read your input Mr HANSEN, many thank's for it.
You're right we were in trouble for nothing.
BTW can your remark about 2SJ108/2SJ74 and 2SK370/2SK170 be applied to 2SJ109-BL and 2SK389-BL ?

jacco vermeulen · 13th June 2007, 12:51 PM

Korben,

look up the datasheets of the 2SK170/2SK370/2SK389.
Parameters of the 2SK170 and 2SK370 are identical, except dissipation.
Nearly all parameters of the 2SK389 are different=different device

Charles Hansen · 13th June 2007, 06:46 PM

Quote:

Originally posted by jacco vermeulen
Mr Hansen,

nice to see you pop up again, welcome back.
Wishing you a less bumpier ride for at least a decade.

Thank you for the kind wishes. I am still in a wheelchair with a great deal of pain. I am working from my house, but only part-time. I am starting a new therapy which is not widely used in the US, but more commonly so in Europe, called Hyperbaric Oxygen Therapy (HBOT). It works miracles with brain injuries (traumatic brain injury, stroke, cerebral palsy, et cetera). It's not so clear that it will help with my spinal cord injury, but it is worth trying.

I haven't been posting so much lately. About a year ago there were some disagreements about what posts were appropriate and what posts weren't. Many of my colleagues were banished. I escaped that fate, but my posts must be approved by a moderator before they are published.

anatech · 13th June 2007, 09:17 PM

Hi Charles,
I'm very sorry to hear of your accident. I wish you the best here.

We are in a similar situation, but I'm not so bad. I can well imagine being stuck in a wheelchair does not help your pain. I can't stay sitting or standing very long. They finally put me on Oxycontin with perq's for breakthrough pain. It just dulls the pain but I can at least function a little.

It sounds like the Hyperbaric Oxygen Therapy would have helped. Oh well.

Are you expected to recover fully (I hope)?

Best wishes and a warm welcome back.

-Chris

jacco vermeulen · 13th June 2007, 10:07 PM

Mr Hansen,

a few overhere are missing the presence of another of your professional collegues for the last couple of weeks.
Probably a lot of the same types who figured 2 decades ago it would be nice to have a chance to get to talk to a designer of one of few loudspeakers which are able to keep up to pace with an ESL.
What's to say, untill i actively blended in this club i wasn't exactly sure what virtual reality was, now i do.

I also have a membership during life pass of the global society of the ex-comatose, damaged nerves and spinal cord types, akfb formerly heavily into wheelchairs, crutches and 24/7 pill swallowing for a jiffy.
24-hour pains drain a lot of energy, would be quite a bummer without medication.
It's my philosophy that smart ones are generally stubborn people, and being stubborn makes a difference.
I've just asked mrs downstairs about HBOT, she's an expert in renovation work, there's indeed also some experimentation with HBOT going on in these parts.
The new thermaltrack design is overwhelming, btw.

anatech · 13th June 2007, 10:12 PM

Hi Jacco,
Too many of us around here. Is this place jinxed by chance?

It takes a stubborn person to go their own way and design anything. It also takes a stubborn person to recover from an accident. I didn't know you were also injured Jacco. Wishing you the best sir.

-Chris

jacco vermeulen · 13th June 2007, 10:18 PM

Chris,

my leg nerves will not really enjoy Colorado winter slope temperatures but other than that i'm a true animal.
I already used to wear thermal underwear during cross country skiing, so no big deal.

anatech · 13th June 2007, 10:20 PM

Hi Jacco,
Good for you!

My answer is easier. I don't like skiing!

I hate snow in general actually. I call it "evil white sh - (you know)".

-Chris

13th June 2007, 07:51 AM	#12
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Mr Hansen, nice to see you pop up again, welcome back. Wishing you a less bumpier ride for at least a decade. __________________ Looks like Sponge Bob has killed another thread.

13th June 2007, 12:51 PM	#14
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Korben, look up the datasheets of the 2SK170/2SK370/2SK389. Parameters of the 2SK170 and 2SK370 are identical, except dissipation. Nearly all parameters of the 2SK389 are different=different device __________________ Looks like Sponge Bob has killed another thread.

13th June 2007, 09:17 PM	#16
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Charles, I'm very sorry to hear of your accident. I wish you the best here. We are in a similar situation, but I'm not so bad. I can well imagine being stuck in a wheelchair does not help your pain. I can't stay sitting or standing very long. They finally put me on Oxycontin with perq's for breakthrough pain. It just dulls the pain but I can at least function a little. It sounds like the Hyperbaric Oxygen Therapy would have helped. Oh well. Are you expected to recover fully (I hope)? Best wishes and a warm welcome back. -Chris __________________ "Just because you can, doesn't mean you should" © my Wife

13th June 2007, 10:07 PM	#17
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Mr Hansen, a few overhere are missing the presence of another of your professional collegues for the last couple of weeks. Probably a lot of the same types who figured 2 decades ago it would be nice to have a chance to get to talk to a designer of one of few loudspeakers which are able to keep up to pace with an ESL. What's to say, untill i actively blended in this club i wasn't exactly sure what virtual reality was, now i do. I also have a membership during life pass of the global society of the ex-comatose, damaged nerves and spinal cord types, akfb formerly heavily into wheelchairs, crutches and 24/7 pill swallowing for a jiffy. 24-hour pains drain a lot of energy, would be quite a bummer without medication. It's my philosophy that smart ones are generally stubborn people, and being stubborn makes a difference. I've just asked mrs downstairs about HBOT, she's an expert in renovation work, there's indeed also some experimentation with HBOT going on in these parts. The new thermaltrack design is overwhelming, btw. __________________ Looks like Sponge Bob has killed another thread.

13th June 2007, 10:12 PM	#18
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Jacco, Too many of us around here. Is this place jinxed by chance? It takes a stubborn person to go their own way and design anything. It also takes a stubborn person to recover from an accident. I didn't know you were also injured Jacco. Wishing you the best sir. -Chris __________________ "Just because you can, doesn't mean you should" © my Wife


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28th May 2007, 04:33 PM	#11
Charles Hansen diyAudio Member Join Date: May 2003 Location: Colorado	You guys are going to a lot of trouble for nothing. The Japanese transistor numbering system is different from the US system. With the Japanese system, the exact same part in a different package is given a different number. The 2SJ108 is the EXACT SAME PART as the much more readily available 2SJ74. The 2SK370 is THE EXACT SAME PART as the much more readily available 2SK170. The only difference is the package. The hard-to-get versions are in a smaller physical package and will only dissipate 200 mW. The easy-to-get versions are in a standard TO-92 package and will dissipate 400 mW.

13th June 2007, 11:13 AM	#13
korben69 diyAudio Member Join Date: Nov 2006 Location: Near Lyon	Nice to read your input Mr HANSEN, many thank's for it. You're right we were in trouble for nothing. BTW can your remark about 2SJ108/2SJ74 and 2SK370/2SK170 be applied to 2SJ109-BL and 2SK389-BL ?

13th June 2007, 10:18 PM	#19
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Chris, my leg nerves will not really enjoy Colorado winter slope temperatures but other than that i'm a true animal. I already used to wear thermal underwear during cross country skiing, so no big deal. __________________ Looks like Sponge Bob has killed another thread.

13th June 2007, 10:20 PM	#20
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Jacco, Good for you! My answer is easier. I don't like skiing! I hate snow in general actually. I call it "evil white sh - (you know)". -Chris __________________ "Just because you can, doesn't mean you should" © my Wife

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