i'm on a roll... the kgsshv

[Laowei]

What would be the VA rating needed, to spec the transformer to power a Carbon?

[JoaMat]

/

Edited November 13, 2015 by JoaMat

[kevin gilmore]

a lot of people don't lift the resistors slightly off the boards, and cause trouble.

 

i can certainly put the ground plane back in if people want it, but the

design is very tight and short, so probably no reason to.

 

here is what the ground plane would look like with 30th clearance,

there is no way to do it on the bottom.

 

http://gilmore.chem.northwestern.edu/kgsshvcarbonv2.pdf

 

takes 5 seconds to put it back on the board if people want it.

 

no way to get to the ground pin on the ground plane for the hv power supply connector

Edited June 29, 2015 by kevin gilmore

[nopants]

is that a warning for all resistors or just prp

[GeorgeP]

Pretty sure prp wasn't alone in leaking through its insulation.

[chiguy]

that is unnecessary but i could probably do it.

the result would be that those parts would get hotter.

 

I'm fine with a couple of small sinks if it's better overall. 

[kevin gilmore]

its one small sink that holds both of them.

 

http://gilmore.chem.northwestern.edu/fatright.jpg

[spritzer]

That sink isn't needed either.  I just put it in there in case I'd want to drive a small heater supply or something like that off that supply. 

[mwl168]

That sink isn't needed either.  I just put it in there in case I'd want to drive a small heater supply or something like that off that supply. 

 

that's a great idea!

[s_r]

Is there much benefit in going with 680uF caps over 470uF ones in the PSU? The kemet 680uF ones are too tall to fit in a 2U case. Not sure if I want to go with the shorter caps or just cut holes in the top cover.

[insanity]

Good point s_r. I didn't not yet realize that the 680uf are actually 80mm tall. The 470uf are "only" 60mm.

[Laowei]

now to find some r-core transformers.

Kevin, have you seen this company: http://jamestransformer.com/en/transformer/index.html

They have built a pretty good reputation with their power and output EI-core transformers for DIY tube amps. They also list building custom R-cores to order. A R-100 core size would be a physically perfect fit for a Carbon. Could add electrostatic shield,.... whatever we want.

There are order sheets on that site that take in all the technical specs. desired and email to them for a quote. I'm not the one to be spec'ing the transformer, maybe someone with more experience could.

Possibly a GB could be arranged.

I frequently travel to Shenzhen China for business (I'm there right now), and could take a day trip to their office/factory in Foshon to check them out if needed.

[palchiu]

I found this chassis from taobao http://tw.taobao.com/item/7504213469.htm?spm=a1z3o.7406521.101.441.OPhvr3&abtest=_AB-LR492-LR501-LR517-PR492-PR501-PV517_1271

 

 

Outside 320(W)*120(H)*311(D)mm

Inside 220*113*300mm

Heatsink 300*50*115

 

Should be nice to combine with KGSSHV-Carbon also big trafos.

 

Another narrow version (260 wide/160 inside) http://tw.taobao.com/item/7504376983.htm?spm=a1z3o.7406521.101.22.IX06iP&abtest=_AB-LR492-LR501-LR517-PR492-PR501-PV517_1271

 

 

What's spec of transformers should make for KGSSHV-Carbon?

[Dave R]

I found this chassis from taobao http://tw.taobao.com/item/7504213469.htm?spm=a1z3o.7406521.101.441.OPhvr3&abtest=_AB-LR492-LR501-LR517-PR492-PR501-PV517_1271

 

 

Outside 320(W)*120(H)*311(D)mm

Inside 220*113*300mm

Heatsink 300*50*115

 

Should be nice to combine with KGSSHV-Carbon also big trafos.

 

Another narrow version (260 wide/160 inside) http://tw.taobao.com/item/7504376983.htm?spm=a1z3o.7406521.101.22.IX06iP&abtest=_AB-LR492-LR501-LR517-PR492-PR501-PV517_1271

 

 

What's spec of transformers should make for KGSSHV-Carbon?

I wonder if Birgir has any plans building KGSSHV Carbon's using the type of chassis in the photo. IMO it looks very nice.

[nopants]

any builder can implement it that way it's just a matter of what fits

[kevin gilmore]

i have finally come up with a better servo,

joamat and kerry had some really good ideas, but referencing

the minus rail causes issues, and then there is the overhead

voltage of the system.

 

so here is something that i think is better because the

reference is ground.

 

http://gilmore.chem.northwestern.edu/newservo.pdf

 

 

the circlotron needs a bigger chassis than that.

 

and its probably too big for the carbon, but sure why not.

 

going to look into transformers very soon.

Edited June 30, 2015 by kevin gilmore

[nopants]

still have 2x kgsshv sumr transformers, should do good substitute duty. maybe I need to dual mono

[JoaMat]

Nice servo.

Edited November 11, 2015 by JoaMat

[kevin gilmore]

version 3 board ready for testing 

 

slightly updated servo schematic

 

the taller caps are really useable in 3U boxes

Edited June 30, 2015 by kevin gilmore

[nopants]

shouldn't we fork the kgsshv carbon from the kgsshv thread

[Kerry]

i have finally come up with a better servo,

joamat and kerry had some really good ideas, but referencing

the minus rail causes issues, and then there is the overhead

voltage of the system.

 

so here is something that i think is better because the

reference is ground.

 

http://gilmore.chem.northwestern.edu/newservo.pdf

 

 

the circlotron needs a bigger chassis than that.

 

and its probably too big for the carbon, but sure why not.

 

going to look into transformers very soon.

Nice I like the idea of decoupling.

[spritzer]

I wonder if Birgir has any plans building KGSSHV Carbon's using the type of chassis in the photo. IMO it looks very nice.

 

Those boxes aren't all that great so I won't be touching them again.  I'll build one mini Carbon into the KGSSHV mini chassis just to test it but after that it will be all custom. 

[nopants]

alright fuck it I'm going to build the carbon with the PSU I was saving for a BH original, I can't take it anymore

 

maybe the siCarbon is worth using the 1968s on as well? or an el34 ccs a la megatron....

[spritzer]

I will do one with the T2 CCS at some point as I'll do a solid state T2.  Also SiC BHSE...  Who needs tubes now... 

[nopants]

isn't the carbon already technically a SiC BHSE, 10m90s and everything?

 

I'm just thinking out loud...a "reverse hybrid" amplifier just sounds pretty cool if one is willing to appropriate the voltage necessary for the tube CCS...maybe even a hybrid mu/beta follower oh man

 

T2 CCS seems pretty manageable if you only need to drop in those 8(?) 3675s. Easy enough to P2P, but I guess infinitely more of a pain in the ass compared to the boards as they are now.