Linear Posted March 13, 2011 Report Share Posted March 13, 2011 Could someone tell me the "specs" on the aluminium angle bracket that mounts on the PCBs in the T2? Is it 1" x 1.5" x 1/8" ? The holes are on 1/2" centers, correct? Are they tapped for 4-40 thread? How far are they in from the edge of the angle bracket? Thanks! Linear Quote Link to comment Share on other sites More sharing options...
Linear Posted March 15, 2011 Report Share Posted March 15, 2011 four per channel... So that's $240 for the output transistors. Going to need bigger heatsinks I wonder how many pieces of justin's new 5 inch heatsink i would have to buy... Nope, not doing this again. NOT doing this again. Someone find me a standard heatsink/chassis assembly that can dump about 150 watts of heat. I might be able to shrink the board to 12 x 12... Gee, things have been quiet here lately! I guess I'm not just late to the party.....the party is over and everyone is listening to their T2s. Anyway, after all his hard work, KG deserves to have this heatsink wish granted. Here is what I should have soon: Material: Aluminum Dimensions: 4" vertical x 5" horizontal Number of fins: 17 Perimeter: 61" Availability: Stock, no minimum order Cost: ~$150 per 18" length I don't have any thermal data yet, but comparing the periphery with other products, the calculations say this thing (18" of it), at 120F, should sink over 150 watts! It will probably be less then that, due to the density of the fins, so as soon as I can, I will measure it myself (hopefully within the next week, or so). KG, I'll send you a 3" sample to try for yourself, after I check it out. Is anyone else out there interested in this for future projects? Maybe the DIY T2 project wore everyone out, both physically and financially! Stay tuned! Linear Quote Link to comment Share on other sites More sharing options...
Kerry Posted March 15, 2011 Report Share Posted March 15, 2011 Don't worry. I've got a build that I've got most of the parts for and am just getting started. I think there are a few others that haven't finished their builds yet. But yeah, I have to believe that most are blissfully listening to their T2s. Regarding the angle brackets, they are currently boxed up, but I can get exact measurements next week. I think they were 1.5" x .73" and approximately .33" from the edge. They are not typically tapped and the hole size I use is approximately .132". Sorry I can't be more precise at the moment. Is that 5" horizontal per heatsink or for two? Sounds massive Quote Link to comment Share on other sites More sharing options...
Lil Knight Posted March 16, 2011 Report Share Posted March 16, 2011 Material: Aluminum Dimensions: 4" vertical x 5" horizontal Number of fins: 17 Perimeter: 61" Availability: Stock, no minimum order Cost: ~$150 per 18" length That are some huge heatsinks. I'm planning for a little different dimension one, 5" H and maybe 3" V. Still haven't decided the style of fins though. Quote Link to comment Share on other sites More sharing options...
Linear Posted March 16, 2011 Report Share Posted March 16, 2011 Kerry, Thanks, but KG already PM'd me the dimensions of the brackets. Everything regarding the above mentioned heatsink is for ONE, so it's 10" horizontal for two! There"s also another version with 12 fins, that's 3.73" horz x 2.75" vert for each heatsink. This smaller one wouldn't give KG his 150 watts, but might work well with T2 power levels (~40W). Approximate cost for this smaller one ~$80 each. Linear Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted March 16, 2011 Report Share Posted March 16, 2011 Don't worry. I've got a build that I've got most of the parts for and am just getting started. I think there are a few others that haven't finished their builds yet. But yeah, I have to believe that most are blissfully listening to their T2s. I'm not sure how many people have now got these running. Last time a poll was done, the count was 5 out of 22 having completed and were listening. Anyone like to volunteer a current number? Quote Link to comment Share on other sites More sharing options...
nattonrice Posted March 16, 2011 Report Share Posted March 16, 2011 (edited) Dispite the fact I just copped a $1k fine for the most stupid of things and I'm meant to be writing a thesis soon, I do plan on taking a crack at finishing this in the coming weeks... Edited March 16, 2011 by nattonrice Quote Link to comment Share on other sites More sharing options...
spritzer Posted March 16, 2011 Author Report Share Posted March 16, 2011 Mine is still about 95% done in terms of assembly with the last parts (RK50 and some transistors) sitting on my desk. Who knows when I'll finally get a day off and can finish this beast... Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted March 16, 2011 Report Share Posted March 16, 2011 (edited) I am working on casing mine up. I'm having some crazy oscillation though and not sure how to really track down a solution :/ I need to get in the shop. I have everything cut, just need to drill and tap a few holes here and there. Edited March 16, 2011 by luvdunhill Quote Link to comment Share on other sites More sharing options...
Dreadhead Posted March 16, 2011 Report Share Posted March 16, 2011 Mine is still about 95% done in terms of assembly with the last parts (RK50 and some transistors) sitting on my desk. Who knows when I'll finally get a day off and can finish this beast... your own fault for winning competitions Quote Link to comment Share on other sites More sharing options...
spritzer Posted March 16, 2011 Author Report Share Posted March 16, 2011 Tell me about it. Then on top of that I can't find any good bakers to work for me... Quote Link to comment Share on other sites More sharing options...
pedefede Posted March 16, 2011 Report Share Posted March 16, 2011 I am about to order the very last parts soon (trafo, screws, etc) - whenever i get the time (you know ... kids & work ). I also have a DAC-build pending - but some time soon, i might join you in the buildingproces as well peter Quote Link to comment Share on other sites More sharing options...
Voltron Posted March 16, 2011 Report Share Posted March 16, 2011 Operational units I can recall: 1. KG 2. Inu 3. Craig Sawyers 4. Andy blubliss Anyone else? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted March 16, 2011 Report Share Posted March 16, 2011 5. Anonymous but it should be obvious who this person is. Quote Link to comment Share on other sites More sharing options...
blubliss Posted March 16, 2011 Report Share Posted March 16, 2011 Jude Quote Link to comment Share on other sites More sharing options...
spritzer Posted March 16, 2011 Author Report Share Posted March 16, 2011 Jude thinks RSA makes quality gear so no... Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted March 16, 2011 Report Share Posted March 16, 2011 5. Anonymous but it should be obvious who this person is. I knew those cases would be perfect for the T2! Quote Link to comment Share on other sites More sharing options...
pedefede Posted March 17, 2011 Report Share Posted March 17, 2011 On the Latest schematic for the PS, there are two types of 0,1uf Caps: C26-29 for decoupling the 100uF caps (before ref102) (these seems to be located on the PCB between the ref102 and op27) C30-33 between the 2sc3675 and op27 These seems to be added later on. - And i cant find any spot for them on the PCB ?!? - Nor are they meantioned in the BOM ?!? Anyone got an explanation? Quote Link to comment Share on other sites More sharing options...
Craig Sawyers Posted March 17, 2011 Report Share Posted March 17, 2011 On the Latest schematic for the PS, there are two types of 0,1uf Caps: C26-29 for decoupling the 100uF caps (before ref102) (these seems to be located on the PCB between the ref102 and op27) C30-33 between the 2sc3675 and op27 These seems to be added later on. - And i cant find any spot for them on the PCB ?!? - Nor are they meantioned in the BOM ?!? Anyone got an explanation? Check back through this thread for modifications on the power supply. In fact I think I posted a summary of mods, to wich KG added one or two I had forgotten. Quote Link to comment Share on other sites More sharing options...
swt61 Posted March 18, 2011 Report Share Posted March 18, 2011 I am working on casing mine up. I'm having some crazy oscillation though and not sure how to really track down a solution :/ I need to get in the shop. I have everything cut, just need to drill and tap a few holes here and there. Don't even think of putting that thing in DIY never never land, before I get a chance to listen to it! Quote Link to comment Share on other sites More sharing options...
wink Posted March 18, 2011 Report Share Posted March 18, 2011 (edited) Dispite the fact I just copped a $1k fine for the most stupid of things and I'm meant to be writing a thesis soon, I do plan on taking a crack at finishing this in the coming weeks... He must have been speeding or getting into public mischief to attract that fine. The only viable alternative s that he's been hit with a fine and an apprehended violence order for stalking the employees at Len Wallis Hifi with a view to getting a loan of their Stax O2 when he gets his T2 built. Chatting up the secretary got him nowhere.... Poor Tom. That's what you get when you engage in tomfoolery...... Edited March 18, 2011 by wink Quote Link to comment Share on other sites More sharing options...
Kerry Posted March 20, 2011 Report Share Posted March 20, 2011 Here's a new amp I just did based loosely on the T2 topology. I was trying to meet a $69 challeng. Close, but fun just the same. I built it for the NYC head-fi meet have a picture of it here: Here's the schematic for it. Sounds pretty good, but there's a bit of tweeking I need to do. I think I'm going to raise the power up a bit (currently 250mA per balanced leg). The heat sinks will take it, but I need to modify the power supply a bit. Thanks to Kevin for his pointers Quote Link to comment Share on other sites More sharing options...
jgazal Posted March 21, 2011 Report Share Posted March 21, 2011 (edited) Here's a new amp I just did based loosely on the T2 topology. I was trying to meet a $69 challeng. Close, but fun just the same. (...) Here's the schematic for it. Sounds pretty good, but there's a bit of tweeking I need to do. I think I'm going to raise the power up a bit (currently 250mA per balanced leg). The heat sinks will take it, but I need to modify the power supply a bit. Thanks to Kevin for his pointers Which input JFETs have you used in the challenge version? LSK170? 2sk170? Edit: Forgive-me, I have just read it that it is 2sk170 Edited March 21, 2011 by jgazal Quote Link to comment Share on other sites More sharing options...
spritzer Posted March 21, 2011 Author Report Share Posted March 21, 2011 I've been turning on the T2 PSU in steps these last few days and it almost blew up in my face. The -260V supply went into meltdown mode and the 680uf/450V cap was burning hot after running for about a minute. Now comes the utter joy of figuring what went wrong... Quote Link to comment Share on other sites More sharing options...
blubliss Posted March 21, 2011 Report Share Posted March 21, 2011 Sorry to hear Birgir Quote Link to comment Share on other sites More sharing options...
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