Just a few questions.When were they manufactured??When were they discontinued??And why??😕
Any fan of them here??
Any fan of them here??
They came in the beginning of the 80's. Made by Hitachi which has changed their name to Renesas. You can still get them, you have second source but the plastic model is available from Renesas.
Parts are always discontiued for three reasons:
1 Won't sell
2 Change of technology
3 Other reasons
I'm a fan. I like them. 🙂
Parts are always discontiued for three reasons:
1 Won't sell
2 Change of technology
3 Other reasons
I'm a fan. I like them. 🙂
UK Supplier link below Please note I have never used:
http://www.mark5.co.uk/products.php?cat=2&pg=32
http://www.mark5.co.uk/products.php?cat=2&pg=32
Hi,
the plastic package replacements for these are available from a few manufacturers.
Are the To3 version only available from Exicon?
Are the Hitachi versions obsolete?
Do Renaisis supply To3 versions? or anyone else?
the plastic package replacements for these are available from a few manufacturers.
Are the To3 version only available from Exicon?
Are the Hitachi versions obsolete?
Do Renaisis supply To3 versions? or anyone else?
when?
i read my first article about these in 1977(?). i think it was in IEE Consumer Electronics Transactions (?). the circuit they presented was the differential first stage, differential vas stage, driving the mosfets directly.
i wrote to hitachi and first got some samples in my hands in late 1979.
mlloyd1
i read my first article about these in 1977(?). i think it was in IEE Consumer Electronics Transactions (?). the circuit they presented was the differential first stage, differential vas stage, driving the mosfets directly.
i wrote to hitachi and first got some samples in my hands in late 1979.
mlloyd1
I have at least 5 pairs-unused- maybe 10 ( not quite sure..)
that I might be willing to trade for MJL21193/21194 or other bipolars suitable for a KSA50 or a Leach....
It will take me a few weeks to dig'em out though....I moved house last year........😉
that I might be willing to trade for MJL21193/21194 or other bipolars suitable for a KSA50 or a Leach....
It will take me a few weeks to dig'em out though....I moved house last year........😉
The K135/J50 have been used by EVERYBODY in the 80's. Soundcraftsmen, SCS-Sound Code Systems Pro amps, Bogen PA amps, Hafler used K134/J49 and K176/J56 variations, Borberly, Tube Works guitar amps and there have been countless others.
it has been said that these were the best sounding mosfets ever made. I dont know that i agree with that but i do admit there is something about them. I love the Soundcrafstmen PCR series of amps. not the most transparent but...
Zc
it has been said that these were the best sounding mosfets ever made. I dont know that i agree with that but i do admit there is something about them. I love the Soundcrafstmen PCR series of amps. not the most transparent but...
Zc
Allow me to add Perreaux to that list.
And the mighty Conrad Johnson Evolution 2000 tube/Mosfet hybrid(1990) 200 watts from 10 Hitachis per channel, mosfet driven, and 5751s up front, 10 discrete regulated rails.
And the mighty Conrad Johnson Evolution 2000 tube/Mosfet hybrid(1990) 200 watts from 10 Hitachis per channel, mosfet driven, and 5751s up front, 10 discrete regulated rails.
pinkmouse said:
Looks suspiciously like a Maplin effort to my eyes...
Schematic here:
http://www.diyaudio.com/forums/showthread.php?threadid=80557&perpage=10&highlight=&pagenumber=1
I posted some thoughts re: the Maplin / Hitachi design here: http://www.diyaudio.com/forums/showthread.php?s=&postid=933001#post933001
Justin
Celestial Emporium of Benevolent Knowledge
I love this categorization. It reminds me of the categorization by Jorge Borges of animals into fourteen different types:
http://en.wikipedia.org/wiki/Celestial_Emporium_of_Benevolent_Recognition
1. those that belong to the Emperor,
2. embalmed ones,
3. those that are trained,
4. suckling pigs,
5. mermaids,
6. fabulous ones,
7. stray dogs,
8. those included in the present classification,
9. those that tremble as if they were mad,
10. innumerable ones,
11. those drawn with a very fine camelhair brush,
12. others,
13. those that have just broken a flower vase,
14. those that from a long way off look like flies.
😀
peranders said:
I love this categorization. It reminds me of the categorization by Jorge Borges of animals into fourteen different types:
http://en.wikipedia.org/wiki/Celestial_Emporium_of_Benevolent_Recognition
1. those that belong to the Emperor,
2. embalmed ones,
3. those that are trained,
4. suckling pigs,
5. mermaids,
6. fabulous ones,
7. stray dogs,
8. those included in the present classification,
9. those that tremble as if they were mad,
10. innumerable ones,
11. those drawn with a very fine camelhair brush,
12. others,
13. those that have just broken a flower vase,
14. those that from a long way off look like flies.
😀
Soundsraftsmen PCR
Where can I get the output transistors [ to-3 ] for these amps? Also need help . Is there anyone who knows how to troubleshoot these amps? I have a lot of these amp and have repaired some of them but some have strange problems I can't seem to fix. I do have all the schematics.
Where can I get the output transistors [ to-3 ] for these amps? Also need help . Is there anyone who knows how to troubleshoot these amps? I have a lot of these amp and have repaired some of them but some have strange problems I can't seem to fix. I do have all the schematics.
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