January 11, 201412 yr Author 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.
January 11, 201412 yr 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
January 11, 201412 yr Author 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.
January 11, 201412 yr 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.
January 12, 201412 yr 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
January 13, 201412 yr 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.
January 15, 201412 yr 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.
January 15, 201412 yr 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, 201412 yr by kevin gilmore
January 15, 201412 yr 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.)
January 16, 201412 yr Is UTsource reliable. It says its a Toshiba and provides a Datasheet from Them. can anyone comment. Thanks Les
January 16, 201412 yr 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
January 16, 201412 yr 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
January 16, 201412 yr 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
January 16, 201412 yr 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
January 16, 201412 yr 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.
January 18, 201412 yr 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
January 18, 201412 yr mine are all GR, but I doubt it matters, they are just used as current mirrors.
January 18, 201412 yr 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.
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