livewire

So, it's been a month since I posted on my necrofied thread. Amp and PSU boards are stuffed, undergoing soldering. The populated CCS boards are now mounted on the heatsinks, the chassis top-plate has been drilled swiss cheese style. The bottom "drawer" has the trafos mounted along with the input & output jacks and IEC module. Still waiting for my 50K Alpha Quad to arrive.... I'll post pics soon when I find my camera. My daughters have a nasty habit of borrowing it and not bringing it back. Hmmm?

Happy Birthday Sir!

The 500 volt CMF-60 is fine.

yes

Happy Birthday Deepak, enjoy the ride!

Happy Birthdiy John!

kgsshvampv7s.zip is the off-board heatsink style amp from the last board run. kgsshvps8e.zip is the PSU from the last board run. I believe these are the latest revision. Keep in mind the PSU uses on-board heatsinks and will require a 3 to 4 inch tall case. On-board heatsinks for the amp is cheaper, but off-board sinks can yield a very low height slimline unit, if done as a two case build. I do not know where to find the zip file for the latest amp boards that use the on-board heatsinks. Keep looking and please note that there were some trace errors in the early revision amp boards.

Sorry to hear of your PSU woes, I can relate. I thought my PSU would never see the light of day. Mine blew twice due to my bumbling with the multimeter while testing the PSU under power. Spritzer once mentioned that heatsinks placed on top of traces could short them because the soldermask paint on the pcb isnt the best insulator. They should be "stood off" above the pcb, not in physical contact. I havent forgot that and now I always check for potential short paths before assembly. My KGSSHV PSU doesnt have the same potential for shorting as your's did. The HV traces run underneath the board, with only the groundplane under the caps. It is a much older revision, a different circuit entirely. I am currently building a KGBH. The PSU has HV rail traces under the caps like your PSU does. I will be insulating these traces additionally with a strip of kapton tape between them and the electrolytic caps. Slight overkill, but cheap insurance nonetheless. One can never be too careful when dealing with high voltage. That shit can jump like a rabbit! It would be nice to see a pic of the underside of your damaged cap. I know nothing about the insulating properties of the plastic they use to wrap those caps, although in the past i have seen caps where the plastic does not wrap over the edge of the metal can or there are perforations in the seam of the plastic. I'm wishing you the best of luck on getting your PSU sorted. Third time's a charm?

I shoehorned a 400VA monster toroid into my KGSSHV after the SumR blew. Complete overkill. Was dirt cheap and does the job well. Runs cool too!

My SumR trafo may have previously taken a lot of abuse, having shorted the psu twice. Also I was experiencing massive inrush upon startup. That cant be good in the long run. My gut feeling says to be careful with your 100VA SumR. But hey, sometimes you just want to roll the dice! You could always fix it if it blows.

Going by previous pictures - maybe this one?: http://alphapotentiometers.net/html/21mm_pot_4.html Dont know the shaft style, taper or R-values he is using.

Guess it's time to get in line here: +1pot & +1pcb if possible. I would like to try this on my current build.

@P14 - nice work on the HV!

PF >> Animals >> Dogs

what is it you are testing there? 2sa1968 are PNP.

Figure on spending around $1000 US dollars for an economy build. If you want to add a fancy case and components, that amount could easily quadruple!

Will be interesting to see what lurks under the hood...

I figured as much, havent tried to figure it out. I hardly post here, the post by post method was easier for me.

Yeah, that is USPS "International Priority Mail". Def not cheap for a small parcel !

Here is the pic from the Dabani auction. They say it is a real photo of their existing inventory. Justin is right about the distinctive look of this TO-220 package. My BDent parts look exactly the same as this photo, number markings also. (click pic to enlarge)

I've read that Dalbani also has offices / warehouses in the UK, Lebanon and Dubai.

I just bought some real ones. From BDent for ~$8.60 each. Get what you pay for.

Do a search in the T2 thread for "Dalbani". Buyer beware! If they honor their 14 day return policy, one could dust off the trusty transistor tester and check for Vbr. VCEO should test at 900V minimum if they are the real deal. If not, return them FAST!

Do a search in this thread for "Dalbani". Buyer beware! If they honor their 14 day return policy, one could dust off the trusty transistor tester and check for Vbr. VCEO should test at 900V minimum if they are the real deal. If not, return them FAST!