headinclouds Posted February 2, 2013 Report Posted February 2, 2013 That's great schubert. I'm very pleased that it is up and running so soon. Glad you like it!
eggil Posted February 2, 2013 Report Posted February 2, 2013 Ok, I'll finalize my Bdent order tomorrow. I just can't seem to find one last component on BDent.com: LT1021-10 (do you happen to have 2 of them, too? ) Check with DigiKey. Schubert, that is a very classy build. Congratulations!
RiStaR Posted February 3, 2013 Report Posted February 3, 2013 Check with DigiKey. Schubert, that is a very classy build. Congratulations! Hi eggil, Thanks for the tip. All parts accounted for with the exception of the 2SC2705s which spritzer is helping me with. Thanks everyone! Seeing all those nice builds just makes me feel like a little boy at Christmas Gratz Schubert!
eggil Posted February 7, 2013 Report Posted February 7, 2013 (edited) Well , Spritzer and Schubert are right. The Pessante 2U is a tight fit Only 10 mmm clearance from the heatsinks to the top cover, which means 6-7 mm risers at most. I am thinking on applying some sort of insulating material to the bottom cover as well, without obstructing the vents. For the top, I purchased the one with the vented covers, like Schubert's. All boards are up and running, with balance at +- 0.3V and offset at +- 0.5V, temperatures in heat-sinks between 49-54 centigrades, higher in the amps than the PSU. Very stable and easier than my first KGSSHV, which took me forever to adjust. Ranges in the first build where +- 1V for balance and +- 3V for offset. This one also has the IXYS parts. Reserving the 1968's for the Megatron. Now comes the hard part. Edited February 7, 2013 by eggil
Victor Chew Posted February 7, 2013 Report Posted February 7, 2013 Congratulations and awsome Enrique. Glad that the build on this amp was less stressful.. What is the white sheet at the bottom of the amp? Is it supposed to make it sound better? I too found the offboard tends to swing the balance and offset more than the onboard.
spritzer Posted February 7, 2013 Report Posted February 7, 2013 The "white steel" is masking tape, essential for chassis work. The 2U is pretty cramped but doable. Nobody should be surprised though as I always try to cram amps into the smallest possible chassis. Just see this work in progress, missing both the PSU's and a bunch of parts but there is no extra room in there.
Victor Chew Posted February 7, 2013 Report Posted February 7, 2013 Ok. Thought it was some kind of acostic paper. Apologies.
livewire Posted February 8, 2013 Report Posted February 8, 2013 Ten tubes in a frontal attack. Time to roast some marshmallows on a stick!
spritzer Posted February 8, 2013 Report Posted February 8, 2013 There are only 8 on this one but it's roughly the same size as the GES so it will get very, very hot.
livewire Posted February 9, 2013 Report Posted February 9, 2013 The blue disks and eight shots of tequila had me thinkin ten.
livewire Posted February 9, 2013 Report Posted February 9, 2013 Catchy tune Wink. Me likey la sexy senorita!
jwzhan Posted February 15, 2013 Report Posted February 15, 2013 (edited) Finally got off my lazy ass and assembled another amp board to replaced the faulty one. It's up and running again... at least for now... All I want to say right now is.... FUCK Ground Plane... Edited February 15, 2013 by jwzhan
kevin gilmore Posted February 15, 2013 Author Report Posted February 15, 2013 when i have time i will fix the ground plane issue around the caps.
eggil Posted February 16, 2013 Report Posted February 16, 2013 (edited) I used Kapton tape and raised the caps a couple of millimeters in my ongoing build as recommended by jwzhan and Spritzer. Looks ugly but no problems so far. Just need to send the panels to FDP when I get the time to do it. On another note, I regret selling my KGSSHV and 007 Mk1, but they went for a good cause: the 009's. This one is not going anywhere, since currently don't have anything other than the SRD7 Mk2. The exstatas are long gone, and are not missed. Edited February 16, 2013 by eggil
s_r Posted February 16, 2013 Report Posted February 16, 2013 Well I received a shipment of boards from batchpcb recently. Problem is I noticed that the solder pads on the bottom of the PSU boards are totally covered in solder resist. Thankfully the amp boards are fine. I'm pretty sure the mistake isn't on my part (I double checked that batchpcb's layers and the files matched up) but just in case these are the files I used: http://www.mediafire.com/?9fb9joxmabyx9b0 I'll probably send a polite email expressing my displeasure to batchpcb, but it doesn't hurt to check with others first. I'll take some pics tomorrow when I have time.
Victor Chew Posted February 16, 2013 Report Posted February 16, 2013 Enrique, your KGSShv came up for sale in the other forum 2 days ago. Not sure if its sold yet.
spritzer Posted February 16, 2013 Report Posted February 16, 2013 There is no way to have the solder resist cover up pads in the software we use so the problem is with BatchPCB.
s_r Posted February 16, 2013 Report Posted February 16, 2013 There is no way to have the solder resist cover up pads in the software we use so the problem is with BatchPCB. That's what I thought. I'll try to get this straightened out then. Anyway, here are a few pics of the boards: http://i.imgur.com/f2qCkcM.jpg http://i.imgur.com/uJzkttK.jpg
spritzer Posted February 16, 2013 Report Posted February 16, 2013 Yeah, those are all but useless. I just checked the Gerbers and the bottom solder resist is there and works perfectly.
luvdunhill Posted February 16, 2013 Report Posted February 16, 2013 Probably your fault. How many files did you upload and how many did you properly assign in their tool?
s_r Posted February 16, 2013 Report Posted February 16, 2013 Only one file, here's what the layers look like: http://i.imgur.com/aBPX9sU.png
s_r Posted February 19, 2013 Report Posted February 19, 2013 Before I make an order with mouser, would anyone mind checking over part substitutions I've made? Some of the parts listed in ujamerstand's BOM are unavailable (or backordered) and I've tried to find a part with identical specs to replace it. Except for the bridge rectifier they're all caps. The original mouser part # is to the left and the substitution to the right: 512-KBU4M > 625-KBU6M-E4 80-C322C102KDG > 80-C330C102JDG 80-C330C474M5R5CA > 80-C330C474M5R-TR 75-561R10TCCV47 > 75-561R10TCCV47BA 661-EKMH250VNN472MP > 661-ESMH350VNN472MP3 If the higher 35V rating doesn't really matter I'll grab the original cap here
jwzhan Posted February 19, 2013 Report Posted February 19, 2013 As far as I can tell, all of the replacements are fine. For the last one, IIRC that cap is for the 15V rail, so I would go with the 25V cap because it's cheaper.
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