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jacco vermeulen 5th November 2005 07:32 PM

Mark Levinson used the 2SB600 and 2SD555 in one of their power amplifiers.
Only Toshiba TO3 with red number printing i've seen.
NEC versions only go to 4 MHz with a cheap TO3 casing.

RetroAudio 5th November 2005 08:03 PM

Hi Jacco,

This is good info and coincides with the differing ft's I've seen posted. Are you saying by any chance that the NECs are not that great and basically need to be avoided? Does a cheap TO-3 mean just not well made? I remember years ago where I used to work that some dept. was having trouble with some Motorola casings coming apart,..or something to that effect.

anatech 5th November 2005 08:07 PM

Hi Guys,
Whow, hold on now. I can't remember whether NEC or Toshiba made the 2SD555 and 2SB600, but in the Japanese system, only one manufacturer makes a certian number. There are no exceptions to this, ever.

If I could only read the Japanese in my data book!


jacco vermeulen 5th November 2005 08:42 PM

Chris, don't need to, i should think before typing.

Original 2SB600/2SD555 are NEC, the current ones are too, or they are sold as NEC devices.
You guys were constantly posting Toshiba, i mixed up.
2SB554 is Toshiba, then there is JVC 2SB555 and Sanyo 2SD600, very confusing.
marking is red though, and ML did use them, i just checked the article to be sure.

The ones that webshops like this one sell for $1.80 are the 4 MHz versions, with a thin metal casing.
The NEC's from the mentioned 15 years ago had thick aluminium casings and did 14 MHz.
I believe Mark Levinson switched to Motorola's when distribution of the NEC's became difficult, the ML23.5 had the Motorola's.
That should be somewhere between 1985 and 1990.

Latest batch year i found was 1993.

Netlist 5th November 2005 08:44 PM

2 Attachment(s)

Originally posted by anatech
There are no exceptions to this, ever.

According to all available sources I have: CDrom and ECA book the manufacturer was Nippon Electric Co., Ltd. (NEC).

Here's all available data I have.

/Hugo :)

Netlist 5th November 2005 08:46 PM

2 Attachment(s)
Paste the .gif's in a photo editor to have a larger view.


RetroAudio 5th November 2005 09:15 PM

LOL,....I get confused with these silly numbers all the time, am constantly rechecking them.

It looks like these have a beta code as well, thought they might. Thanks for the input Netlist! Now I know to have a heads up when buying sight unseen. Seems this transistor has some history to it and it might be easier to just stick with the Motorolas, which makes me all that much more curious about the NECs!

anatech 6th November 2005 04:44 PM

Hi RetroAudio,
If you have them, use them. For new stock I would buy the Motorola parts from a known distributor.

That's a great data book! Way more information than I have. I wish I could read German!

I get mixed up on the brands all the time. So I look at an original to figure it out. I still wish the Japanese book was written in English. There is so much more information in the book. I can figure out the numbers and headings but the text is beyond me.


Netlist 6th November 2005 05:00 PM


Originally posted by anatech

That's a great data book! Way more information than I have. I wish I could read German!

One can't have everything, knowledge and data. That's where we complement. ;)
In fact, when you look carefully, the small text is written in English as well. All other data is quite universal EE-jargon. Too bad me and my scanner did a rather sloppy job.

As far as my German goes, Grenzdaten would be 'Absolute max. ratings' and Kenndaten would be 'Typical ratings'. Any German speaking member correct me if needed.


Christer 6th November 2005 05:07 PM


Originally posted by anatech

That's a great data book! Way more information than I have. I wish I could read German!

You don't actually need to learn many words to understand a databook or a datasheet. Don't fall into the trap of believing you have to learn a language in order to be able to extract useful information from technical or scientific texts. I had a friend who took a course on russion for mathematicians. I asked him if he found russian a difficult language. His answer was, well, you don't really need to understand much russian in order to read a mathematical text.

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