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Group Buy for KG's Boards (2nd)

Lil Knight

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I've got the permission from Dr Gilmore for a second run of boards, so let's do it again. :)


Linky to the spreadsheet: https://docs.google.com/spreadsheet/ccc?key=0AoNVeoQi85GgdFVrMmtReVpWNVBsQUo2Sl9iSkItM2c#gid=0


Please take a look at the notes before putting your needed quantity.


If you want something extra (like a single PSU or amp), just put a note under Extra Requirement column.


The Megatron is not fully-tested so if you really want to try it, do it at your own risk. :)


Silkscreens for the boards:

+ Megatron: http://farm6.staticflickr.com/5489/9229564952_a344b73826_b.jpg

+ KGSSHV onboard: http://farm6.staticflickr.com/5340/9224679066_7e0d75ce72_b.jpg

+ Dynahi onboard: http://farm4.staticflickr.com/3766/9224677548_684d380315_b.jpg

+ Krell KSA5 amp: http://farm4.staticflickr.com/3811/9224678604_f27ca08bcb_b.jpg

+ Krell KSA5 orignal PSU: http://farm4.staticflickr.com/3686/9224677986_a5942b46cd_b.jpg

+ Krell KSA5 alternative PSU: http://farm6.staticflickr.com/5530/9222155343_25f327b2b2_b.jpg

+ Squarewave: http://farm3.staticflickr.com/2855/9221901485_071c577c68_b.jpg


I will let the GB go for 2-3 weeks and then go ahead ordering for boards. Probably another 3 weeks for fabricating. Shipping time right after.

Feel free to let me know if I miss something.



Edited by Lil Knight
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The KGSSHV PSU will work for the Megatron.  The universal was just that but with an extra C- supply for the BATE, ESX etc. and a delay line for the tube heaters.  I'll use the BH supply so just above 400V.  Much smaller and stuff I already have assembled...  :)


For the Dynahi the S22 will do just fine but don't skimp on the heatsinks. 

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Hi Tran,


Questions about notes in spreadsheet.


Squarewave = KSA5 PSU + Amp Is that means "One set" include 1 x PSU and 2 x amp PCB?


Dynahi onboard = 2x New amp board ONLY. No PSU.  "One set" include 2 x amp PCB for balanced setting?






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Hi Pal,


Overkill is a standard here so everything will be balanced, if possible.


The quantity in the spreadsheet is for set which already includes amp boards and PSU board, not the number of single boards, so please take note of that.

Extra Requirement column is used just in case you want something extra or for backup.


The KSA5 and Squarewave share the same PSU which is either original or alternative. Choose what you want.


KGSSHV = 2x amp boards (either mini onboard or standard offboard) + 1x mini PSU.

Squarewave = 4x amp boards (each board is single channel) + 2x KSA5 psu (either original or alternative, just note what you want).

Dynahi onboard = 2x amp boards for balanced. Use the Sigma22 for PSU.

KSA5 = 1x amp + 1x PSU. Since the board is huge, it's stereo only. Putting the quantity = 2 if you really want it balanced.

Megatron = 1x amp for now. I will see if I could add the PSU for it. If not, the KGSSHV PSU will be included.


From what I see from the spreadsheet, eggil seems to be confused about the extra requirement :) The PSUs are already included in the set.

Nebby and holland might be confused about the number of sets.



Edited by Lil Knight
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holland might be confused about the number of sets.


Yeah, I am.  I will correct, thanks much!  I'm glad to hear that everything will be balanced sets.  I added a request for a PSU for the Megatron, but if you're including something I'll remove that too.



No problem on my end.  Not tested just yet but I should have the final parts this week. 



Edited by holland
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original version was cascading zeners. which is not really fully regulated, but

has been evaluated to be ultra quiet, noise levels in the 50's of nanovolts.


the second version is fully regulated, but may or may not be as quiet.


krell produced both versions.


the first version with lower voltage zeners is suitable for the squarewave.

the second version you would have to change 2 resistors.

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