eggil Posted January 11, 2014 Report Share Posted January 11, 2014 Are they a reliable source? Quote Link to comment Share on other sites More sharing options...
justin Posted January 11, 2014 Report Share Posted January 11, 2014 yes, they're arrow Quote Link to comment Share on other sites More sharing options...
spritzer Posted January 11, 2014 Author Report Share Posted January 11, 2014 Thanks spritzer, One I found was Chip1stop.com. Havent looked at their stock. How is your unit running?. Still pleased with it. Do you Know how many have been built?. Les Mine is still out of commission but then again, I haven't touched it in months. Too many projects, not enough time. Quote Link to comment Share on other sites More sharing options...
iwik Posted January 11, 2014 Report Share Posted January 11, 2014 Mine is still out of commission but then again, I haven't touched it in months. Too many projects, not enough time. Thanks,don't remind me, just retired so hope I will have more, but what people tell me it wont happen. Nice site for the Diyer in Audio, must keep an eye on this site. Les Quote Link to comment Share on other sites More sharing options...
spritzer Posted January 11, 2014 Author Report Share Posted January 11, 2014 Yeah, we tend to build a lot of stuff. Today I've been working on ways of making a very complicated singled ended triode Stax amp. Quote Link to comment Share on other sites More sharing options...
iwik Posted January 11, 2014 Report Share Posted January 11, 2014 That's why I seem to be attracted here, been a diyer in Audio for nearly 50 years. Cut my teeth on Valves and really nice to see this stuff back in favour. There is a place for both old and new technology. Not up to design level especially not now. Grey matter weakening but like to keep what brain cells ive got left ticking over. Quote Link to comment Share on other sites More sharing options...
iwik Posted January 12, 2014 Report Share Posted January 12, 2014 Yes I would be on a group buy of these transistors if it proceeds. Thanks Les Quote Link to comment Share on other sites More sharing options...
iwik Posted January 12, 2014 Report Share Posted January 12, 2014 Yea, I scored myself a board set, Kevin had an early series and needs some mods. Really happy, now the hunt starts for legit semi's. First I must buy a DY924 tester. Anyone who has just started to source any components and can update possible sites for the real semi's would be appreciated. Les Quote Link to comment Share on other sites More sharing options...
DefQon Posted January 13, 2014 Report Share Posted January 13, 2014 Today I've been working on ways of making a very complicated singled ended triode Stax amp. You can make it even more complicated by adding mosfets into the design. Quote Link to comment Share on other sites More sharing options...
spritzer Posted January 13, 2014 Author Report Share Posted January 13, 2014 Mosfets are fine for a CCS... Quote Link to comment Share on other sites More sharing options...
nopants Posted January 15, 2014 Report Share Posted January 15, 2014 Kevin mentions in the dynahi thread a "single" version of the 2sc3381, does anyone know the specific part number? I figure it might be relevant here since they are going for $18 a pop on bdent. Quote Link to comment Share on other sites More sharing options...
GeorgeP Posted January 15, 2014 Report Share Posted January 15, 2014 Here: Quote Link to comment Share on other sites More sharing options...
iwik Posted January 15, 2014 Report Share Posted January 15, 2014 Are the 3381 on fleabay no good. Les Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted January 15, 2014 Report Share Posted January 15, 2014 (edited) depends if they are real or not. they sure were a lot cheaper a few years ago. and you do need 10 of them. Make sure they are all the same grade. In that package, they pretty much have to be real. Edited January 15, 2014 by kevin gilmore Quote Link to comment Share on other sites More sharing options...
jwzhan Posted January 15, 2014 Report Share Posted January 15, 2014 Is the DIY Audio person not selling it anymore? I recall he was selling the GR grade 10 for $15... Or is GR grade hfe not high enough? (didn't read the entire thread.) Quote Link to comment Share on other sites More sharing options...
iwik Posted January 16, 2014 Report Share Posted January 16, 2014 Is UTsource reliable. It says its a Toshiba and provides a Datasheet from Them. can anyone comment. Thanks Les Quote Link to comment Share on other sites More sharing options...
GeorgeP Posted January 16, 2014 Report Share Posted January 16, 2014 Is the DIY Audio person not selling it anymore? I recall he was selling the GR grade 10 for $15... Or is GR grade hfe not high enough? (didn't read the entire thread.) nope Quote Link to comment Share on other sites More sharing options...
justin Posted January 16, 2014 Report Share Posted January 16, 2014 Is UTsource reliable. It says its a Toshiba and provides a Datasheet from Them. can anyone comment. Thanks Les They sell both real and fake parts Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
iwik Posted January 16, 2014 Report Share Posted January 16, 2014 Thanks Guys, If I have to take a punt, what are the results of using the fake ones?. Which to use if I have to GR or BL. Les Quote Link to comment Share on other sites More sharing options...
justin Posted January 16, 2014 Report Share Posted January 16, 2014 2sc3381 would be hard to fake. i dont know any other dual npn transistor that uses the same package that they could relabel. it would be way too expensive for them to make their own fake in that package. so they are either real or they dont actually have them Quote Link to comment Share on other sites More sharing options...
Pars Posted January 16, 2014 Report Share Posted January 16, 2014 There was some speculation that some of the fake J109/K389s that tested as bipolar parts might have been these... I'd agree that making fakes in this packaging would not be economically feasible, unless the faker was looking to lose money. Quote Link to comment Share on other sites More sharing options...
iwik Posted January 18, 2014 Report Share Posted January 18, 2014 Can anyone comment on 2SC3381 variants GR and BL. I see the BL has 2 x the gain of the GR. BL seem easier to get but as one is used in each battery is there enough adjustment. How will it effect output of the amp as the audio input stage uses them also. BOM doesn't specify. Also thanks guys for your feedback on Fake parts. Les Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted January 18, 2014 Report Share Posted January 18, 2014 mine are all GR, but I doubt it matters, they are just used as current mirrors. Quote Link to comment Share on other sites More sharing options...
GeorgeP Posted January 18, 2014 Report Share Posted January 18, 2014 Someone just asked again. the 2sc3381-BL's work just fine. That is what i'm using. Hey Kevin, I see I am not the only one who sometimes forgets little things like this. But as you said, it doesn't really matter - having read through the thread regarding this issue before, people used both BL and GR without any consequence. Quote Link to comment Share on other sites More sharing options...
iwik Posted January 18, 2014 Report Share Posted January 18, 2014 Sorry guys, been thru the thread 1.5 times and missed it second time thru. Les Quote Link to comment Share on other sites More sharing options...
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