s_r Posted September 2, 2013 Report Share Posted September 2, 2013 I feel like kicking myself now. I had -15V hooked into the - pole instead of ground. How the LED worked for so many hours with such a dumb mistake is beyond me... Anyway, do you have any of those orange switches you were planning on getting spritzer? Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted September 2, 2013 Author Report Share Posted September 2, 2013 that explains the fried resistor. Quote Link to comment Share on other sites More sharing options...
spritzer Posted September 2, 2013 Report Share Posted September 2, 2013 Nope and won't order for a while. Quote Link to comment Share on other sites More sharing options...
johnwmclean Posted September 2, 2013 Report Share Posted September 2, 2013 Beautiful Kerry! Quote Link to comment Share on other sites More sharing options...
SoupRKnowva Posted September 3, 2013 Report Share Posted September 3, 2013 So I replaced my output bias resistors today. Im using the IXYS parts at 500 volts, so I was kind of worried, since you guys were saying they drift alot more than the sanyo parts do, and not to raise it too much. But i replaced the 180 resistors with 100 ohm ones. to raise the current to 10mAs, and I rebiased after about 2-3 hours of leaving it on and got all my biases down under .2 volts so I was pretty pleased Quote Link to comment Share on other sites More sharing options...
spritzer Posted September 3, 2013 Report Share Posted September 3, 2013 It's not that you can't get it to zero out, it's just how different the voltages are at power on. Quote Link to comment Share on other sites More sharing options...
SoupRKnowva Posted September 3, 2013 Report Share Posted September 3, 2013 It's not that you can't get it to zero out, it's just how different the voltages are at power on. Solution: leave it on all the time Quote Link to comment Share on other sites More sharing options...
Victor Chew Posted September 4, 2013 Report Share Posted September 4, 2013 (edited) So I replaced my output bias resistors today. Im using the IXYS parts at 500 volts, so I was kind of worried, since you guys were saying they drift alot more than the sanyo parts do, and not to raise it too much. But i replaced the 180 resistors with 100 ohm ones. to raise the current to 10mAs, and I rebiased after about 2-3 hours of leaving it on and got all my biases down under .2 volts so I was pretty pleased Can you share the change in the sound impressions? Edited September 4, 2013 by Victor Chew Quote Link to comment Share on other sites More sharing options...
Kerry Posted September 4, 2013 Report Share Posted September 4, 2013 I don't have a comparison from the lower powered to the higher powered KGSShv, but I did spend 4 hours listening and A/B'ing the Blue Hawaii and the KGSShv last night. I was listening to the Stax O2/Mk I and switching them between the two amps. Without going crazy loud, it was hard to tell much of a difference. I occasionally turned up the volume and the KGSShv did seem to hold its own. All the things that make me smile with the BH were there - wide sound stage, deep and clear bass, remarkable separation of voices and instruments with incredible detail. Makes me happy just thinking about it. Quote Link to comment Share on other sites More sharing options...
GeorgeP Posted September 4, 2013 Report Share Posted September 4, 2013 Solution: leave it on all the time What are the balance and offset after a cold start? Would be interesting to know. Quote Link to comment Share on other sites More sharing options...
shipsupt Posted September 6, 2013 Report Share Posted September 6, 2013 Gents, I've got a few versions of the off-bards around. Does anyone recall when the crossed feedback on the off-boards was fixed (which version)? Quote Link to comment Share on other sites More sharing options...
eggil Posted September 6, 2013 Report Share Posted September 6, 2013 I am thinking it was still wrong on v 0.4 Quote Link to comment Share on other sites More sharing options...
shipsupt Posted September 6, 2013 Report Share Posted September 6, 2013 And I think it is right on the .6, which has the global and local feedback choice, but I'm not sure about .5 Quote Link to comment Share on other sites More sharing options...
GeorgeP Posted September 6, 2013 Report Share Posted September 6, 2013 It was certainly fixed by version 0.5. Quote Link to comment Share on other sites More sharing options...
particleman14 Posted September 6, 2013 Report Share Posted September 6, 2013 I have the .5 version offboards and am unsure whether to cross the diodes or not. Can anyone confirm for sure this was fixed in the .5 offboard version? (my original build was .4) Quote Link to comment Share on other sites More sharing options...
jwzhan Posted September 6, 2013 Report Share Posted September 6, 2013 (edited) I think I have the v0.5 and it's fixed, but don't trust my word, because I don't have the board with me as I type this. You should just check your board against the schematic. It should be fairly easy to identify. I can check for you when I get home. never mind that! I didn't see GeorgeP already answered it. Edited September 6, 2013 by jwzhan Quote Link to comment Share on other sites More sharing options...
spritzer Posted September 6, 2013 Report Share Posted September 6, 2013 Yuo, 0.5V is the first production version and that one is 100% correct albeit huge. Quote Link to comment Share on other sites More sharing options...
shipsupt Posted September 6, 2013 Report Share Posted September 6, 2013 Birgir, you're going to give my build a complex with all this talk about being oversized! It's just big boned. Quote Link to comment Share on other sites More sharing options...
spritzer Posted September 6, 2013 Report Share Posted September 6, 2013 Well I'm one to talk, I don't think I'd ever be called petite... Quote Link to comment Share on other sites More sharing options...
wink Posted September 7, 2013 Report Share Posted September 7, 2013 Vikings are NEVER petite...... Quote Link to comment Share on other sites More sharing options...
eggil Posted September 7, 2013 Report Share Posted September 7, 2013 (edited) The new boards are tiny! Edited September 7, 2013 by eggil Quote Link to comment Share on other sites More sharing options...
spritzer Posted September 7, 2013 Report Share Posted September 7, 2013 That was the point. Quote Link to comment Share on other sites More sharing options...
Kerry Posted September 8, 2013 Report Share Posted September 8, 2013 I got a chance to put the amp on the scope. It looks great! Response is totally flat from 10Hz up through 40KHz + (I didn't look much beyond this). I also looked at the FFT function on my scope and that looks great as well. Here's some shots of the scope with the FFT window. I'm showing 1KHz, 10KHz and 20KHz. I also looked at noise with the volume all the way down and I was seeing about 50mV. Not bad for my house. I'm going to keep the chassis width at 8" since I don't see that contributing to the noise floor of the amp. Quote Link to comment Share on other sites More sharing options...
shipsupt Posted September 8, 2013 Report Share Posted September 8, 2013 Well, not quite as exciting as the new stuff Kerry is working on, but I'm happy to report that I mounted and tested two amp boards today and everything is up and running! Another KGSShv is slowly coming to life... I've got everything in hand now to case it and wire it. I've been at this one for a while, but I think I can see the finish line now. Quote Link to comment Share on other sites More sharing options...
Kerry Posted September 8, 2013 Report Share Posted September 8, 2013 Congrats! Quote Link to comment Share on other sites More sharing options...
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