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  1. As several people have asked for the PSU boards, and some whether caps are available lets probe the interest. Group Buy moving ahead - collecting payments, and then ordering. Please bear in mind that lead time is 12 weeks ... edit: added: "Group Buy moving ahead - collecting payments, and then ordering.", and price confirmation.
  2. EDIT 8/4: attach updated GB details and remov outdated chart EDIT 7/31: attach updated GB details and remov outdated chart EDIT 7/27: attach GB details and remov outdated chart EDIT 7/23: attach PCB cost quotes and limit first time poster to 4 set of amp boards max. EDIT 7/19: proposing use of HV Carbon V5 board to replace both V2 and V3 boards. See posting # 190. EDIT 7/13: attach snapshot of final order entries and board count. EDIT 7/12: This GB is officially closed as of 7/12/2015. Due to the changes Kevin made to the PS boards, it'll take a few more days for these boards to be checked before I officially request quotes from the fab houses. I hope to have information on the cost of the various boards to share in a week or so. I will post an image of the spreadsheet here for all to review. EDIT 7/9: Please double check and confirm or make any final updates to your record on the spreadsheet by end of day Saturday, July 11. On Sunday, July 12, I will officially close the GB, lock down the counts of the various boards, post a snap shot of the spreadsheet on this thread for your review and proceed to request final quotes from the fab houses. As promised, I am planning a KGSSHV Carbon GB which includes both the amp boards and the PS boards. First I like to gauge the interest for the GB which will also help me estimate the cost of the PCB boards. My plan is to make 2mm thick PCB with 2oz copper. (EDIT 0731: HV PS boards are upgraded to 3oz copper) For the amp board, we'll most likely use the latest board, kgsshvcarbonv2.zip and kgsshvcarbonv3.zip that Kevin posted on June 30 which has the cascode CCS and uses mostly current parts including the PZTA SMD parts. This board measures 5.45 x 4.05 inches according to Kevin. THIS BOARD HAS NOT BEEN CHECKED NOR TESTED AT TIME OF WRITING. For the HV PS board, we have the following options (these HV boards contain built-in LV supply): 1. the GoldenReference dual HV (kgsshvpssicfetdual2new.zip that Kevin posted on June 27, 6 x 6.48 inches). I have checked this board by tracing the PCB visually and Kevin has corrected the issues I spotted and updated the schematic accordingly (see Kevin's post #4802 on the KGSSHV thread for the schematic). I cannot guarantee I did not miss something. THIS BOARD HAS NOT BEEN TESTED. 2. the split/single, "skinny" PS boards (one board for each rail), they are kgsshvpssicfetsinglenewleft.zip and kgsshvpssicfetsinglenewright.zip which were also posted on June 28 (3 x 6.48 inches). THESE SINGLE PS BOARDS HAVE NOT BEEN CHECKED NOR TESTED. 3. the split/single, "fat" PS boards (one board for each rail), they are kgsshvpssicfetsinglenewleftfat.zip and kgsshvpssicfetsinglenewrightfat.zip which were posted on June 28 (4.05 x 5.45 inches). THESE SINGLE PS BOARDS HAVE NOT BEEN CHECKED NOR TESTED. For stand alone Golden Reference LV PS, two options (THESE PS BOARDS HAVE NOT BEEN CHECKED NOR TESTED): 1. the dual LV (goldenreferce3.zip) 2. the single LV (goldenrefernceplus4.zip and goldenreferenceminus4.zip) We'll need to at least check these boards before proceeding to have them fabricated for the GB. I will try to find time to trace them but can really use others' help for double-checking. To gauge the interest and to help get an idea of the volume in order to determine the cost, please respond with the following information (be specific) if you are interested in participating in this GB: 1. How many amp boards do you want. (one channel on each board, you need two amp boards for one complete amp.) 2. Which HV PS (dual, single skinny or single fat) and how many of them do you want. (you need at least one dual board or two single boards for one complete amp.) The HV PS has built in LV and bias sections. The separate LV PS and Bias boards are optional. 3. Please use this link to register your request: https://docs.google.com/spreadsheets/d/1GWDWwLfsIDtwn1HB-x76lS6WyWwLd5lwsORFKiUuuEQ/edit?usp=sharing The chart below is for reference only and not up to date. The spreadsheet contains the up to date information. Please let me know if I missed anything. It's advisable to read the the following posts at the minimal for relevant information to this GB: 16, 34, 42, 51, 68, 80, 89, 92, 113. More to come. Thanks! EDIT 6/28: updated information due to the newly released "fat" single PSU and updated gerber files for PCBs EDIT 7/3: added Golden Reference LV and Bias board options and start using sorenb's shared spreadsheet EDIT 7/6: remove early spreadsheet image Note: For the single PS boards, quantity of 2 indicates the participant will receive 1 left and 1 right boards (or 1 plus and 1 minus for the LV).
  3. Hi: I am organizing a mini group buy of HGSSHV PCB boards. I intend to move very fast so please read this post carefully if you are interested. I'll be using the kgsshvampv16mini.zip for the amp boards and kgsshvpsminifinalstn9360.zip for the PSU boards. The amp boards are the one-board-per-channel, off-board heatsink version. Both amp and PSU boards have provisions for current production parts. See here for the Gerber files and the KGSSHV thread for more information. I plan to use SeeedStudio to fabricate the PCB boards. The boards will be 2 layer, 1.6mm thickness, 2oz copper, HASL surface finish and standard green color PCB. Each set of the boards includes 2 amp and 1 PSU boards. I call this a mini GB for a reason; I only intend to make either 5 or 10 sets of the boards. I am keeping 2 sets myself so I am looking for a maximum of 3 to 8 participants. If we get 5 sets made, the cost of each set is $50 USD, if we get 10 sets made the cost per set drops to $33 USD. This amount does not include PayPal fee and shipping cost (from me to you). SeeedStudio is having a free-shipping special for orders over $150 but orders need to be placed before Feb. 25. If we qualify for this special, per set cost will be reduced by about $5. Orders won’t be shipped till after Feb. 26 due to the Chinese New Year Holiday. I have used SeeedStudio for my SuSy Dynalo PCBs and was happy with the outcome. You can read my posts in the Multiamp/Dynalo MK II thread. The KGSSHV, of course, operates at much much higher voltage so participate in this GB at your own risk. You should read the KGSSHV thread before making your decision. Here is how I plan to organize this mini GB (I am a DIY hobbyist and have never organized a GB so I am sure I will miss some logistic details. I apologize ahead of time.): 1. Please respond to this thread with your firm commitment. If we have more commitments than can be accommodated, inclusion will be based on a first-come-first-serve basis (FCFS). 2. I will close the GB by 8pm central time Friday, Feb. 20 or when we reach the 3 or 8 sets commitments, whichever comes first. 3. At the close of the GB, I will PM each participant who is included in the GB with a confirmation and my PayPal account information. Firm commitment that did not get included in the GB will be put on a sequenced waiting list, again, FCFS. 4. The GB participants that receive my confirmation PM need to send $30 USD to my PayPal account by 8pm central time, Monday, Feb. 23 for down payment and confirmation. I can then hopefully send in the order in time for the free-shipping special. 5. GB participants that do not send me the PayPal payment by 8pm central time Monday, Feb. 23, are assumed to have withdrawn from the GB. The vacant spot will be offered to the next person(s) on the waiting list. 6. When I received the PCB boards from SeeedStudio, I will PM each of the participants with additional amount to cover the remaining PCB cost, PayPal fee and shipping cost to you. I will use your PayPal shipping address to calculate the shipping cost and it is where I will ship the boards to. Please PM me if you want your boards shipped to other address. 7. The board set will be sent when I receive the PayPal payment stated in 6. 8. If I do not receive enough commitment by Friday, Feb. 20, I will likely abandon the GB. We’’ll have play by the ear if this happens. Please let me know if I missed something. I’ve been reading the KGSSHV thread and am very excited about the prospective of joining the Stax Mafia. Hope this will be a fun and exciting project for all of us. Best! Michael