kevin gilmore Posted October 11, 2014 Report Posted October 11, 2014 JoaMat has sent me the board layout, and I'm working on it. He did not need silkscreens, everyone else is definitely going to need them. Could do it as 1 board instead of 4. As one board it would be 11.77 x 7.8 inches. So a bunch smaller than the 16 x 12 of the original And using 10m90s definitely removes a bunch of parts. And so does the lt1021, although that one part is probably double the cost of the led's and fet it replaced. Way more stable though. Quote
Jon L Posted October 11, 2014 Report Posted October 11, 2014 As one board it would be 11.77 x 7.8 inches. So a bunch smaller than the 16 x 12 of the original And using 10m90s definitely removes a bunch of parts. And so does the lt1021, although that one part is probably double the cost of the led's and fet it replaced. Way more stable though. Cheers to the sliver of hope that mere mortals may be able to own a T2, at least a higher chance than currently Quote
kevin gilmore Posted October 11, 2014 Report Posted October 11, 2014 (edited) suggest you buy as many 2sk79 and 2sk216 as you can, you are still going to need those. no suitable replacement for those yet. All the other parts are mouser. http://gilmore.chem.northwestern.edu/t2modified.jpg Getting the power supply to match that physical size going to be just about impossible. Edited October 11, 2014 by kevin gilmore Quote
nopants Posted October 11, 2014 Report Posted October 11, 2014 is 1156 a direct drop in for 1486? Quote
spritzer Posted October 11, 2014 Author Report Posted October 11, 2014 (edited) Yes but rated to only 400V compared to the 600V 1486. Edited October 11, 2014 by spritzer Quote
RiStaR Posted October 11, 2014 Report Posted October 11, 2014 Thanks Kevin and Joamat for pulling it together for the rest of us mortals Quote
Aive Posted October 11, 2014 Report Posted October 11, 2014 Hey joamat, your boards look fantastic. What method do you use to etch those? Printer toner transfer? Quote
kevin gilmore Posted October 11, 2014 Report Posted October 11, 2014 please check for errors http://gilmore.chem.northwestern.edu/t2modified.jpg Quote
Kerry Posted October 11, 2014 Report Posted October 11, 2014 (edited) Oh crap! I'm feeling the need to build this. haven't looked closely yet, but you still have some transistors labeled with 2SC3675. were you thinking of doing this as one or four boards? Edited October 11, 2014 by Kerry Quote
nopants Posted October 11, 2014 Report Posted October 11, 2014 (edited) four boards might give a little more flexibility in casing, you can stack the output stage over the front end Might be cheaper to fab four smaller boards as well Edited October 11, 2014 by nopants Quote
spritzer Posted October 11, 2014 Author Report Posted October 11, 2014 I know I will build one. Quote
johnwmclean Posted October 11, 2014 Report Posted October 11, 2014 I like it a lot. I do prefer the single board layout. Nice one Kevin and Joamat. Quote
kevin gilmore Posted October 12, 2014 Report Posted October 12, 2014 here is the schematic http://gilmore.chem.northwestern.edu/t2schemmodified.pdf hopefully the two match. Quote
GrindingThud Posted October 12, 2014 Report Posted October 12, 2014 Oo, T2 on ebay: http://www.ebay.com/itm/STAX-SRM-T2-SPS-T2-the-amplifier-T2-2-/301344346036?pt=UK_AudioVisualElectronics_HomeAudioHiFi_Headphones&hash=item462985cfb4 Quote
nopants Posted October 12, 2014 Report Posted October 12, 2014 10m90s on the board bottom has 120 and 100, top has 300 and 100, schematic has 300 and 200? Quote
kevin gilmore Posted October 12, 2014 Report Posted October 12, 2014 correct values are 100 ohms gate, 300 ohms cathode. fingers getting tired after a day of typing. Quote
nopants Posted October 12, 2014 Report Posted October 12, 2014 No worries, easy to gloss over things when porting files around I also don't see any 2sk216 in the battery schematic, but they're on the silkscreen Quote
GrindingThud Posted October 12, 2014 Report Posted October 12, 2014 (edited) Pots in parallel with the 510R have no label on the silkscreen. Is .5W big enough for the 47R heater ground resistors? Edited October 12, 2014 by GrindingThud Quote
chiguy Posted October 12, 2014 Report Posted October 12, 2014 Mmmm, very tempting. Awesome work! This may be my next project after I finish my KGST. Quote
kevin gilmore Posted October 12, 2014 Report Posted October 12, 2014 (edited) there is no 2sk216 in the battery. The 2sk216 feeds the top of the battery. also there are no 1k resistors to measure the batteries with, I will fix that. Edited October 12, 2014 by kevin gilmore Quote
JoaMat Posted October 12, 2014 Report Posted October 12, 2014 (edited) / Edited November 11, 2015 by JoaMat Quote
Inu Posted October 12, 2014 Report Posted October 12, 2014 (edited) JoeMat, Very nice! use LT1021 to the active battery is good idea. Keven, can you add extra pattern for the solid state input (LSK389 and 2SK170 x2) option? Edited October 12, 2014 by Inu Quote
JoaMat Posted October 12, 2014 Report Posted October 12, 2014 (edited) / Edited November 11, 2015 by JoaMat Quote
Kerry Posted October 12, 2014 Report Posted October 12, 2014 It would be nice to get Q32 on the main heat sink as well. Quote
kevin gilmore Posted October 12, 2014 Report Posted October 12, 2014 It would be nice to get Q32 on the main heat sink as well. don't think that can happen. latest, with input pots, done for the day. and I did spell his name wrong, will fix that later. http://gilmore.chem.northwestern.edu/t2modified.jpg Quote
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