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So, there seems to be competition in the market; behold the TKD-401. This looks like stereo only, but I bet between channel tracking is very precise, as long as you keep going straight.
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Just basic JJ El34's. From what I understand, different tubes should have limited sonic inpact in this curcuit, but I got the GB BH boards for a later build and there I think changes may be more audible. Apart from looking for exotic, I also intend to try the JJ EL-34L which the guitar crowd claims had more bottom end than the regular JJ EL-34. Fun times ahead
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Well, vacation is over and my GG lives. Turned out to be a partially dead lsk389 on one channel and a cold solder joint on the other, combined with too high tail resistor values on both. Obviously not my finest hour stuffing those boards . Anyway, the amp sounds really really good, so many thanks to KG and all other contributors for this great circuit! Now to find some exotic and good looking EL-34's to top it off...
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If that's the board from page 2 of this thread, I don't think it has a servo on board...
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Very good guide. I'm away vacationing for a few days, so this will be next sunday's mental exercise. Whatever the error is it's symmetrical, cause both amp boards are acting up identically. I'll post back once I've investigated a bit more...
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Looks excellent! Trying to sort mine out as well, was suspecting the lsk389 are dead because while voltages are fine with inputs shorted they go crazy when fed a signal, but a cold solder joint on the nfb might explain that as well. Where did you find the rings for the top lid? They look great!
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Package arrived here also. Many thanks!
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If you have (or can get hold of) a british IP-address when signing up: http://www.qobuz.com/gb-en/plans/music-streaming-subscription Great for jazz and classical.
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Second that. Some nice write-ups based on actual testing of different cable types, including USB: http://archimago.blogspot.se/2015/06/musings-audio-cables-summary-non.html Summed up; if your DAC is asynchronous (i.e. the computer is not doing the clocking), every cable which meets USB2.0 requirements will perform identically.
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Paid. Many thanks!!
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Yeah, apparently the car was not meant for any employee to just take for joy driving . I'll have to make some friends in higher places first. Next GB though...
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Interesting. Always was a Tuborg fan; guess the exotic stuff from other countries taste better :). Also, In Sweden, beer commercials were not allowed when I was that youngster age, so the only promotion available was from Tuborg. - Du Perikles - ka' Du sige mig - hvornår smager en Tuborg bedst? - Hvergang! Guess that had an influence...
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Good to know that I will have full moral support and backup when trying to explain why that nice demo car had to have some uptime
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Indeed Coincidentally, I walked by a 450+ BHP Volvo S60 Polestar this morning when going to a meeting at work; I briefly considered "borrowing" it and just make a run for the border with gwrskien's boards.
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All european destined boards have now been shipped onward from the swedish hub. PMs with shipping costs will follow tonight.