nattonrice Posted June 15, 2011 Report Share Posted June 15, 2011 Awesome work =D Quote Link to comment Share on other sites More sharing options...
Pars Posted June 15, 2011 Report Share Posted June 15, 2011 Nice work Kerry! Is that one of KG's boards, or did you have those made? Quote Link to comment Share on other sites More sharing options...
Voltron Posted June 15, 2011 Report Share Posted June 15, 2011 indeed! It's looking great Kerry! Quote Link to comment Share on other sites More sharing options...
ujamerstand Posted June 15, 2011 Report Share Posted June 15, 2011 Go Kerry! Quote Link to comment Share on other sites More sharing options...
spritzer Posted June 15, 2011 Author Report Share Posted June 15, 2011 Woot!!! Mine just needs to have the heaters hooked up plus sort the earth but I sadly have no time to spend on it... Quote Link to comment Share on other sites More sharing options...
Horio Posted June 15, 2011 Report Share Posted June 15, 2011 Great work Kerry! Spritzer, if I was that close to finishing, I think I'd just pull an all nighter if necessary. I can't wait to hear what both you guys think of the amp. Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 15, 2011 Report Share Posted June 15, 2011 all nighters and high voltage are a bad idea. Quote Link to comment Share on other sites More sharing options...
spritzer Posted June 15, 2011 Author Report Share Posted June 15, 2011 Yup, way too many of those in the past... Quote Link to comment Share on other sites More sharing options...
wink Posted June 15, 2011 Report Share Posted June 15, 2011 (edited) burnt1.bmpburnt.bmp Edited June 15, 2011 by wink Quote Link to comment Share on other sites More sharing options...
manaox2 Posted June 16, 2011 Report Share Posted June 16, 2011 Quote Link to comment Share on other sites More sharing options...
livewire Posted June 16, 2011 Report Share Posted June 16, 2011 Poor Stax! Such a waste... Quote Link to comment Share on other sites More sharing options...
kevin gilmore Posted June 19, 2011 Report Share Posted June 19, 2011 birgir's unit up and running. Evidently he has a noisy pot in one of the batteries, same as the problem andy had. Must be a large batch of bad trimpots. Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted June 19, 2011 Report Share Posted June 19, 2011 Which pot? Is it perhaps the one that is (nearly) directly over one of the LED legs and a resistor? Quote Link to comment Share on other sites More sharing options...
blubliss Posted June 19, 2011 Report Share Posted June 19, 2011 I think I replaced both on one side so couldn't say. It may have been the 10k. Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted June 20, 2011 Report Share Posted June 20, 2011 I'm wondering if it's related to the hissing issue that Inu found (and fixed). Seems like some extreme oscillation, that's cured once the amp gets a little more to a stable operating point. Then, once the pot is replaced, the other pot in that battery is already at a more sane location and the issue goes away. This would sorta make sense, given the fix that Inu performed (see link I posted a while back). Quote Link to comment Share on other sites More sharing options...
Kerry Posted June 26, 2011 Report Share Posted June 26, 2011 I've got two questions for the group: 1 - Does anyone have the part number for the coupler that goes from the Alps RK50 to the extension rod? 2 - The Neutrik connectors seem to push in a bit when you press the release tab. There is an unthreaded hole on the bottom of the neutrik connector where it mounts to the board. Has anyone tapped this and screwed it in? Is this recommended? Thanks. Also, I thought I would throw these pictures up... Quote Link to comment Share on other sites More sharing options...
luvdunhill Posted June 26, 2011 Report Share Posted June 26, 2011 (edited) Mouser 534-1453 perhaps? Edited June 26, 2011 by luvdunhill Quote Link to comment Share on other sites More sharing options...
Kerry Posted June 26, 2011 Report Share Posted June 26, 2011 The Alps shaft is about 8mm and the extension shaft is .25". I can look at McMaster, but wanted to see what other people did first. Quote Link to comment Share on other sites More sharing options...
spritzer Posted June 26, 2011 Author Report Share Posted June 26, 2011 I just enlarged the hole with a 8mm drill. I'll have to redo them since I can only get 6mm shafts here and it just makes a lot more sense to use a 8mm shaft. Speaking of my amp, I got new pots but the right channel is still fubar. Anybody whose dealt with loktal tubes knows this sound so the tube sockets are at the top of my suspect list. Quote Link to comment Share on other sites More sharing options...
pedefede Posted June 27, 2011 Report Share Posted June 27, 2011 Hi All Just wanted to share my (slow!) progress: PS Amp Seems i keep find small new components, i forgot to order ... peter Quote Link to comment Share on other sites More sharing options...
Lil Knight Posted June 27, 2011 Report Share Posted June 27, 2011 I have a weird feeling looking at those pics Quote Link to comment Share on other sites More sharing options...
nattonrice Posted June 27, 2011 Report Share Posted June 27, 2011 Holy shite! Buying the full set of prp was expensive enough... Shinkoh ftw Quote Link to comment Share on other sites More sharing options...
pedefede Posted June 29, 2011 Report Share Posted June 29, 2011 Assembling the mosfets 2sk216 and 2sj79 now is there any way to match them? (since there are a lot of parameters etc., and I dont know the operating mode/conditions). I allready did the simple test: http://www.4qdtec.com/mostest.html all K216 turned out fine. But got trouble with J79: I have 5 (1 extra - but from a different production batch. The 4 reads "6 G5" and 1 "0 J15 5yx"). Now one of the 4 cant be turned permanently on by the diode-tester (or my finger). the internal diode reads about 450 when off. Which suggests "some issue" with the internal capacitance. But i have no clue wether this is relevant. The extra from another batch works, but reads 425 when off. Which one to discard? Or better: what other test to perform? peter Quote Link to comment Share on other sites More sharing options...
pedefede Posted July 5, 2011 Report Share Posted July 5, 2011 (edited) Assembling the mosfets 2sk216 and 2sj79 now is there any way to match them? (since there are a lot of parameters etc., and I dont know the operating mode/conditions). I allready did the simple test: http://www.4qdtec.com/mostest.html all K216 turned out fine. But got trouble with J79: I have 5 (1 extra - but from a different production batch. The 4 reads "6 G5" and 1 "0 J15 5yx"). Now one of the 4 cant be turned permanently on by the diode-tester (or my finger). the internal diode reads about 450 when off. Which suggests "some issue" with the internal capacitance. But i have no clue wether this is relevant. The extra from another batch works, but reads 425 when off. Which one to discard? Or better: what other test to perform? peter Build myself a rough curvetracer, for testing/matching and the K216 seemed rather similar. And alle the J79 was ok - but the one from the different batch was quite different. However just as i finished, i somehow burned one of the good quad - and the dealer doesnt have any more from that batch So i need buy 2 new "low gain" types, to put in one of the channels peter Edited July 5, 2011 by pedefede Quote Link to comment Share on other sites More sharing options...
livewire Posted July 5, 2011 Report Share Posted July 5, 2011 Better to find out now... Quote Link to comment Share on other sites More sharing options...
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