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Old 9th March 2010, 08:08 AM   #1041
steenoe is offline steenoe  Denmark
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Quote:
Originally Posted by Magura View Post
Now what's the name of that critter again?

Magura
Those are J110's. Onsemi even claims they are suited for audio purposes.

Have a look at the latest scavenging results. The Jfets on this picture were sitting in an old, top of the line, yamster preamp. If you thought the 2sj109's were rare then try to get your hands on some sk147/sj72 complementary pairs I beleive the 2sj90/2sk270's are pre sj109/sk389, dual fets. Any info on those would be really appreciated. Maybe Jacco, if you are watching?
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Old 9th March 2010, 11:53 AM   #1042
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Quote:
Originally Posted by steenoe View Post
2sj90/2sk270's are pre sj109/sk389
Lunch comes before posting garbage.

J90/K270 are still found in early 80s gear (for instance Harman stuff as the HK870), NEC was also still manufacturing duallies in an identical package in that period.

Japanese semi manufacture tends to keep devices in production for roughly two decades, makes the Siliconix SST/U monolithic dual JFET series look downright silly.
Matched HD-Dually sets as J73/K146 and J75/K240 were manufactured in parallel with the monolithic dual jfet J90/K270.
Japanese device series production tends to overlap, but without addition of a complete new production line, so starting up manufacture of the J109/K389 likely meant shutting down the earlier monolithics.

Hey, hang on, you're ruining a perfectly good junk thread with this talk !
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Last edited by jacco vermeulen; 9th March 2010 at 11:55 AM.
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Old 9th March 2010, 04:35 PM   #1043
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File Type: gif 2sj90.GIF (22.1 KB, 186 views)
File Type: gif 2sk147.GIF (21.5 KB, 178 views)
File Type: gif j110.GIF (25.1 KB, 175 views)
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Old 9th March 2010, 06:10 PM   #1044
steenoe is offline steenoe  Denmark
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Thanks for info guys I knew you knew something Its nearly impossible to find any info on those parts. Here is a little more funny stuff from the yamster (Dont worry, this is the last (I think)). Dual BJT's! The basepins are tied together at pin 3. I feel like puttin' those old components into that Kubota Takashi preamp that Babo once posted. Those dual BJT's were born for that purpose, it seems. Sure would please him, if he is watching.
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File Type: jpg kubota takashi_preamp.jpg (60.0 KB, 107 views)
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Old 9th March 2010, 06:23 PM   #1045
Zen Mod is offline Zen Mod  Serbia
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Steen - that's sissy pre - currents through stages aren't good even for phono section .....

I'll draw improved schematic with one hand tied , even if I'm toob boy .

same story as Kaneda pre , well known from ancient times ...


in fact - make it if you like wooly sound ........

regarding 7-legged bjts - look at schematic of ZM's Silver and Manu's HK

you can guess - both main pcbs are naked now - waiting for population per new schematic .

edit :

Babo is looking now , that's sure
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Old 9th March 2010, 06:34 PM   #1046
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Darn, I have been working my #ss off, all afternoon on a pcb layout
Its pretty much done and just needs a little cleaning up. Custom footprints for the Toshiba parts Well, at least it resulted in a pretty neat input section if you ask me
BTW the dual BJT's are only 5 legged beasts. Is this the new schematic for ZM's Silver?
Manu's HK Tower & ZM's Silver Turm
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Last edited by steenoe; 9th March 2010 at 06:51 PM.
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Old 9th March 2010, 06:56 PM   #1047
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look at Serbian DIY-a , ther is one nice Kaneda thread .... and our funny kwayzee Juma/Sipi posted pretty nice Jfet in /folded cascode /blahblah output stage line stage amp

there is also Protel pcb file for one of variants , with somewhat lower voltage and without cascodes .

anyway - if you're making it symmetric , and with NFB - just make it susy ; there is no point in doing different .

if you're going in otherway - symmetric and wthout global NFB - make your BLowtorch (you remember megagigagizmosupoerduperblaster egotrip thread ? ) iteration

if fun is name of da game - make toob pre , and forget this sissy parts without vacuum implemented



( you know that I'm joking ; do what you wanna do - I just wish ya best fun )
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Old 9th March 2010, 07:14 PM   #1048
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Nice, I will take a look at that Kaneda story, and yes its all about fun
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Old 9th March 2010, 07:16 PM   #1049
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Quote:
Originally Posted by steenoe View Post
Those are J110's. Onsemi even claims they are suited for audio purposes.

Have a look at the latest scavenging results. The Jfets on this picture were sitting in an old, top of the line, yamster preamp. If you thought the 2sj109's were rare then try to get your hands on some sk147/sj72 complementary pairs I beleive the 2sj90/2sk270's are pre sj109/sk389, dual fets. Any info on those would be really appreciated. Maybe Jacco, if you are watching?
I have some 2SK146/147 and their p-channel compadres!
Besides getting rid of them, what can I do with them? Could do a MC-stage of course... Hmmmm
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Old 9th March 2010, 07:42 PM   #1050
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Quote:
Originally Posted by R-K Rønningstad View Post
I have some 2SK146/147 and their p-channel compadres!
Besides getting rid of them, what can I do with them? Could do a MC-stage of course... Hmmmm
They can be used as substitutes sk170/sj74. They can dissipate even more heat. R-K dont bother building anything with them, just send them to me. Thats a lot easier for you, right I recall looking for 2SK147's some years ago when i wanted to build Kuy-yang-wang's "El-Cheapo" with MC input. I gave up finding them, back then. He suggested 2SK369 as substitutes as far as I recall.
BTW, dont hang me if Kuy's name is misspelled
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