Heads up on Ebay: HP 6633B (0-50V 2A) power supplies - Page 1
Forum section: electronics / general

author: AndyC_772
author_rank: Super Contributor
timestamp: July 03, 2014, 07:03:35 am
content: These don't crop up too often; the 663xB series are superb power supplies, and although the 6632B (0-20V @ 5A) is fairly readily available, the other models in the range are elusive by comparison.This seller has a bunch of 6633B units for sale - 0-50V @ 2A.http://www.ebay.co.uk/sch/yokohama-premium/m.html?_nkw=&_armrs=1&_from=&_ipg=25&_trksid=p3984.m1423.l2654They're shipping from Japan for free... can't imagine what that's costing in postage (they're *heavy*!), and with that in mind the total price of US$300 all-in is pretty good IMHO.Note: they'll be set to run of 100V, but that's easily changed. The service manual shows how to reconnect the mains transformer for other voltages, and it's perfectly straightforward to do. Just remember to open it up and swap a few wires around before plugging in, especially if you're in Europe!No connection with the seller - just figured it was a good chance to pick up a rare item of decent kit.

author: babysitter
author_rank: Frequent Contributor
timestamp: July 04, 2014, 06:39:18 am
content: Well, maybe there is a yet invisible tax to it... requiring you to dispose TEPCO waste from Fukushima?A radionuclide sample box might be shipped with it?

author: neslekkim
author_rank: Super Contributor
timestamp: July 04, 2014, 07:51:29 am
content: I wonder what is the difference between 6631, 32 and this 33, all are 100w, are there any posibilities to reconfigure them ?

author: KJDS
author_rank: Super Contributor
timestamp: July 04, 2014, 08:08:04 am
content: Quote from: neslekkim on July 04, 2014, 07:51:29 amI would be amazed if there isn't significant differences in the circuitry. Dealing with 20V at 5A is very different to dealing with 100V at 1AThe service manuals are online for those desirous of detailed investigation

author: AndyC_772
author_rank: Super Contributor
timestamp: July 04, 2014, 08:15:07 am
content: I actually looked at converting one of my 6632B's into a 6633B at one point. The circuits are very similar, though IIRC the primary transformer is actually different between the models, rather than just being a common transformer with its secondary windings connected differently. That was the show-stopper.Everything else is pretty similar, and it's even possible to reset the model number in the firmware so it knows the proper voltage and current ranges to accept.

author: neslekkim
author_rank: Super Contributor
timestamp: July 04, 2014, 09:17:54 am
content: Quote from: KJDS on July 04, 2014, 08:08:04 amYes, found them, but found not much of interrest in it, but I found that you actually have the 6632b.. but you probably don't have free shipping to NorwayNot sure if I have room for these either, heavy, and looks to be very big in size.

author: KJDS
author_rank: Super Contributor
timestamp: July 04, 2014, 09:57:00 am
content: I can't do free shipping to Norway, but I can take away the VAT, so the shipping would effectively be free.

author: neslekkim
author_rank: Super Contributor
timestamp: July 04, 2014, 11:46:26 pm
content: Quote from: KJDS on July 04, 2014, 09:57:00 amThat would be something!What does this mean: "output terminal perspex cover is missing from these units."

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: July 05, 2014, 12:01:15 am
content: QuoteI guess it means originally it had a perspex plate over the terminal block, but this is now missing.No show stopper.

author: mtdoc
author_rank: Super Contributor
timestamp: July 05, 2014, 12:11:41 am
content: Seller has zero feedback. Risky!

author: neslekkim
author_rank: Super Contributor
timestamp: July 05, 2014, 05:39:21 am
content: ah, found some pics on google, it's the plastic box .. was wondering what perspex was..

author: AndyC_772
author_rank: Super Contributor
timestamp: July 05, 2014, 07:07:26 am
content: I have one on the way; I bought the first one before a whole load more were listed. Will report back.

author: KJDS
author_rank: Super Contributor
timestamp: July 05, 2014, 07:54:41 am
content: Quote from: HackedFridgeMagnet on July 05, 2014, 12:01:15 amI've got a few of the perspex covers, just far fewer than I have supplies.

author: AndyC_772
author_rank: Super Contributor
timestamp: July 11, 2014, 11:29:30 am
content: My PSU arrived today.It's quite old and tired, in need of a clean, and the display is quite dim. That much doesn't surprise me, and although it's a shame it's not bright and shiny, it's not a problem. Converting it from 100V to 240V mains was dead easy, there's a wiring diagram in the service manual and it's just a case of swapping a few spade terminals around. Just don't forget!It wasn't well packaged, though, just a layer of bubble wrap inside a cardboard box, which appears to have offered little or no protection in the post. There are quite a few small plastic bits that have broken off, which is really annoying because it's so completely unnecessary. The front panel knob was damaged too, though fortunately the design is such that it is actually possible to put the bits back together and bend its clips back into shape. It seems to work OK.I'm too busy to actually load it up and test it out electrically, but it seems OK. The only things actually loose and rattling around were bits of broken plastic, and they're just cosmetic. The electronics inside were dusty but otherwise look fine.I won't be buying another, though. (I guess five 663xB power supplies is enough for any one person's lab, right?)

author: robrenz
author_rank: Super Contributor
timestamp: July 11, 2014, 11:33:50 am
content: Quote from: AndyC_772 on July 11, 2014, 11:29:30 amOne never has enough power supplies

author: babysitter
author_rank: Frequent Contributor
timestamp: July 11, 2014, 01:20:44 pm
content: Did you check it for activity?