KGSSHV Carbon Build Thread

[starcat]

11 minutes ago, Sebtdi said:

I got mine on Ebay and they were authentic Cree's 170D. Nothing blew up in smoke and sounds great

Can you post the sellers name? Thx.

On 7/22/2021 at 4:14 PM, chinsettawong said:

This is my version - 3D printed using ABS filament.  

Nice work!
Could you post or link the source file for the 3D printer. Thx.

[Sebtdi]

11 minutes ago, starcat said:

C2M1000170D

https://www.ebay.ca/itm/184068141515?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160908105057%26meid%3Dadffc43ed5bb45b092e0f77bc2a7d440%26pid%3D100675%26rk%3D6%26rkt%3D15%26sd%3D255043710488%26itm%3D184068141515%26pmt%3D0%26noa%3D1%26pg%3D2380057%26brand%3DUnbranded&_trksid=p2380057.c100675.m4236&_trkparms=pageci%3A0600f83e-f062-11eb-865a-d67029b9e26f|parentrq%3Af2127ed217a0a9bf870512d7ffeab476|iid%3A1

[starcat]

30 minutes ago, Sebtdi said:

https://www.ebay.ca/itm/184068141515

Thanks, Sebtdi. Possible to possible pics from front and back of the actual SICs?

[Kovax]

I hope chinsettawong will not mind me posting this link to the 3D file.

https://www.tinkercad.com/things/7pGkeN939L6

Thanks guys for the quick response, but I would prefer getting my Crees from a source I can trust.

BTW, those parts from an Ebay link do look fake, I red through this entire thread and have seen pics of the real deal.

[starcat]

8 minutes ago, Kovax said:

BTW, those parts from an Ebay link do look fake, I red through this entire thread and have seen pics of the real deal.

Replace with 1200V Cree's, you don't need 1700V.

Edited July 29, 2021 by starcat

[Kovax]

How about using IMW120R350M1H?

https://hr.mouser.com/datasheet/2/196/Infineon_IMW120R350M1H_DataSheet_v02_02_EN-1622448.pdf

I like its capacitances, only thing is a bit higher gate threshold voltage, VGS(th). Does that matter in Carbon amplifier? 

[starcat]

On 7/16/2021 at 7:46 PM, starcat said:

Stuffing some Carbon boards over here while waiting for parts... 

Optimising the physical layout in the chassis.

I was wondering why is that 10M90S on the positive GRHV board mounted on that Aavid heatsink and not directly to the side heatsink as the others, any particular reason? It always gets in the way.

Edited July 29, 2021 by starcat

[Sebtdi]

5 hours ago, starcat said:

Thanks, Sebtdi. Possible to possible pics from front and back of the actual SICs?

https://drive.google.com/file/d/1kONFqikB5jMEJ1nzhZ8jyTLDO_XnbLjK/view?usp=drivesdk

[kevin gilmore]

that is the bias supply current source and is at at least 700v. best for highest isolation.

[Pars]

2 hours ago, starcat said:

I was wondering why is that 10M90S on the positive GRHV board mounted on that Aavid heatsink and not directly to the side heatsink as the others, any particular reason? 

I think that 10M90S is for the bias voltage. I assume it doesn't get that hot, but don't know the actual reason for the on board heatsink instead of sinking it to the main heatsink/bracket. It does look like there is sufficient board real estate available to have done that instead.

 

EDIT: Kevin beat me to it while typing; go with his explanation.

Edited July 29, 2021 by Pars

[starcat]

4 minutes ago, kevin gilmore said:

that is the bias supply current source and is at at least 700v. best for highest isolation.

Thanks, Kevin! So, it should not be moved off that Avid heatsink?

I thought about mounting it downward facing and sticking it to the main amp's heatsink, same as the other sands (I would not be using brackets but mounting them directly on the heatsinks on the amp sides).

Edited July 29, 2021 by starcat

[kevin gilmore]

you can use a shorter heatsink. maximum is about .7 watt

[johnwmclean]

Another Carbon in the works, I received my panels and drilled heatsinks back today.
I haven’t put it together yet... I sure hope everything fits.

 

 

Adobe Illustrator preliminary file:

Edited August 13, 2021 by johnwmclean

[johnwmclean]

More progress, it’s been a while since I tested one of these, I used Soren’s adjustment method for the CCS which worked well, dialled in for 19mA 

Edited August 20, 2021 by johnwmclean

[johnwmclean]

Finally done!

I regrettably sold my previous KGSSHV Carbon a while ago, this one’s not going anywhere soon.

This is a 400V, 19mA version, using the ground plane amp board, Sumr transformer and Goldpoint V47 attenuator. I bought the heatsinks from China and had all the drilling and panels done at Front Panel Express. I pulled out the Canon 5D from the cupboard for some tasty shots.

 

[Beefy]

That's epic, dude! VERY nicely done!

[Lord_Rexter]

3 hours ago, johnwmclean said:

Finally done!

I regrettably sold my previous KGSSHV Carbon a while ago, this one’s not going anywhere soon.

This is a 400V, 19mA version, using the ground plane amp board, Sumr transformer and Goldpoint V47 attenuator. I bought the heatsinks from China and had all the drilling and panels done at Front Panel Express. I pulled out the Canon 5D from the cupboard for some tasty shots.

 

I was lucky enough to grab your old Carbon 😊

I could see subtle changes from your old Carbon - volume pot, one output instead of two, ventilation holes at the back, directional changes to the XLR input/outputs am sure it would be sounding A M A Z I N G 👍

[Sebtdi]

Nicely done!

What brand of attenuator did you get? Balanced quads are quite expensive

[swt61]

Beautiful build John!

[n_maher]

15 hours ago, Beefy said:

That's epic, dude! VERY nicely done!

This.  Sweet Jesus, that thing is awesome.

[rayofsi]

On 8/22/2021 at 2:17 AM, johnwmclean said:

Finally done!

I regrettably sold my previous KGSSHV Carbon a while ago, this one’s not going anywhere soon.

This is a 400V, 19mA version, using the ground plane amp board, Sumr transformer and Goldpoint V47 attenuator. I bought the heatsinks from China and had all the drilling and panels done at Front Panel Express. I pulled out the Canon 5D from the cupboard for some tasty shots.

 

this would look great next to my kerry t2! lol, what are the outside measurements, this build looks tight!

[johnwmclean]

13 hours ago, rayofsi said:

this would look great next to my kerry t2!

It really isn’t patch on Kerrys magnificent builds, he’s on a whole other level.

[bbest]

Hello all!

 

After succesfull build GG moved to Carbon (board version 0.6). Soldered all components. Tested Right channel - all good.

But with Left chanel some problem: with [balance] test all ok, [Current Adjust] seems also good. But problem with [offset]. It has voltage 405V (with +P left channel, same as -P). When trimmed [offset] it has diviasion +-10V. But it is not enougth for set 0V. All resistors with their nominals, seems no short circute, LEDs glows.

Where could be problem?

Edited September 20, 2021 by bbest

[bbest]

Left chanel say hello to grave: half sands went to trash 😅 . Now looking for DN2540N5-G and C2M1000170D, but they are out of stock. Could someone suggest by which analogs it could be replaced?

[kevin gilmore]

do no replace these parts.  buy from someone that has them or wait.