It's totally fine to run +20V over on the bias, probably quite a bit more. I'm asking more out of curiosity. FWIW, I use a DY294 to pick zeners with the closest tolerances, and replace 100V with 91V versions, but that's my OCD talking more than any real need.

typical high voltage zeners are +/-3% no matter what the specs are

the el-cheapo meter works great for hand picking parts

I placed our order of the boards with PCBnet today and received order confirmation. The boards should be ready to deliver to me by August 27 or sooner. I am going to start working on preparation for packaging and shipping in the next few days. 

I will keep you all posted

Look at what FedEx dropped off today:

Here is what I found inside:

 

Got home late tonight. Will post more pics tomorrow.

 

 

 

 

Edited August 28, 201510 yr by mwl168

Wow! That was quick!

Soldering irons are at the ready..........

WOW!  that must be a good couple of KG's/$ worth of pcb's there. That didn't take very long.

Excellent!

More pics of the PCBs as promised.

Out of town this weekend. Should start shipping packages out next week.

 

 

 

Edited August 28, 201510 yr by mwl168

They look good.  Excitement mounting!

Speaking of mounting (pun intended, sorry!), does anyone have recommendations for finding appropriate angle brackets? I don't have easy access to a machine shop to make my own, and it doesn't look like attaching transistor tabs directly to the heatsinks is an option here. 

Hey Gepard, checkout your local hardware store, they should sell strips of angled aluminium brackets. They're usually quite thin though (if that's an issue?) 2 - 3mm thick...

I agree with Aive. I am also planning on using backets from my local hardware store. I will do the cutting and drilling myself (not that many holes needed per bracket). But if someone has no access to a drillpress and saw, this could be difficult. 

I was also thinking if a thickness of 2-3mm was enough, but thats the only thing they sell. 

I once used some 30mm x 30mm x 5mm angle for the brackets. I bent the legs of a 10M90S 90deg so they align with there corresponding holes exactly, however once i put a ceramic washer 2mm thick i believe underneath, the legs of the 10M90S were barely visible from the other side! i now use 3mm thick angle (E-bay) and it seems to work just fine.

  

Just a sanity check - angle brackets for the heatsinks? How big of a bracket, as big as is reasonable? Confidence that will produce enough ability to radiate heat?

the angle brackets bolt to much bigger heatsinks, same way as T2

because the sicfets are bigger I am now using 1.5 x 1.0 inch aluminum angle bracket .125 thick

Got it, so the brackets go on the the PCB top, the silicon is bent horizontal to bolt to the angle bottom, and the angle vertical then bolts to the side mounted heatsink. 

I've only finished the KGST and KGSST so far with the on board heatsinks, got a Megatron board done except the final silicon (PS has the offboard heatsink), and a DIYT2 so haven't figured out how the offboard heatsinking is supposed to work. Makes sense, thx

There will be a few days delay in shipping of boards. I apologize.

Went down to the main USPS office Saturday morning to pick up packaging supply only to be told that they do not have any of the kind I need in stock and that I have to order them online.  Placed the order last night and it says it will take 3 - 5 business days.

Boards are sorted and ready to be packaged. The boards appear to be very good quality by visual inspection.

   

No problem here, and thanks for all of your efforts!

I am sorry I don't have good news on the USPS shipping.

The two kinds of packing containers I ordered a week ago, one did not arrive this week (supposed to be 3 -5 business days, it has been 6 days now), the one arrived today was not what I ordered (wrong dimension).  Went down to another post office and was told again that they too do not have those containers in stock. Very disappointing!

I did pick up a few containers that's only good for domestic priority shipping and cannot accommodate the GR HV Dual PSU. It's also not padded like the one I ordered. I will start shipping domestic orders that do not include the GR HV Dual boards.

I apologize again for this delay.   

No problem, Thanks for the GB.

Edited September 6, 201510 yr by palchiu

No problem....Best to get the right packing materials. UK customs appear to have little regard for whats inside international packages judging by the condition some of my parcels arrive in!

A bit of good news following the disappointing news last; my wife was able to score a few of the USPS containers (large padded priority mail envelope) I have been expecting from a grocery store of all places today. The attached photo is some of the packages ready to be shipped. As you can see some of them are still awaiting their containers. 

The photo is out of focus on purpose to protect privacy   

Edited September 6, 201510 yr by mwl168

Great. Hope my boards are among the ones that are ready to go

 

//UFN

looks great, thanks for putting these together as always