OMG this 2400B must weigh 150lbs I have no need for a 11stone power supply! I think i am going to tear that one down. the transformers are massive. It's a dual supply and as far as i can tell. it uses one transformer for the dual B+ and one for the Dual C- supplies and 1 transformer each for the dual 6.3V supplies. It's just too damn heavy to keep around the shop.
Sorry, no I don't. But they are pretty simple and operate the way you suggested. Someone in Canada is offering a manual on eBay. See the link below. I also suspect that a little higher voltage output could be had by modifying the resistive voltage divider string at the input of the control amplifier.
Lambda Instruction Manual for Model #C481 on eBay.ca (item 130365190268 end time 07-Apr-10 22:21:14 EDT)
I have one of those Lambda potted transformer modules I got on Epay. It weighs a ton, and I haven't figured out a worthy use for it as of yet.
Hi: Just joined this forum. Started out looking for info on a Kepco Labs Model 800 that I am trying to activate after almost 40 years in storage. It's in fairly good shape except thr large aluminum can condenser located toward the rear in center broke off at the base and the can is missing. It was a dual unit. The three terminal base and nut is still there. Can anyone tell me what the ratings would be? 2 X ??? mfd. @ ??? volts? Additionally I just determined today that the small centrally located transformer #100-149A Has the high voltage winding and one other shorted. If anyone is parting out one of these I MAY BE INTERESTED IN BUYING or trading for it. Otherwise I may want to sell whats left of this one. I don't like the thought of packing or shipping one of these though!!! Does anyone know of a source for a schematic? Any commenets would be appreciated! Reply here or to: gvandy2@ cox.net --- 
gvandy ---
gvandy ---
That looks like a single voltage unit. Completely different layout than mine which is dual voltage.
I have a Parts 400B and a 2400B which i will most likely part out as it is just way way way to ******* heavy! If you figure out the parts you need. Let me know and when i get a moment i will see if either unit has them.
Zc
Zc
As stated in the post above the Kepco transformer # is 100-149A. I have no number for the capacitor. Is the 400B a dual voltage unit? Tomorrow I will try to post some photos of mine. Thanks for the reply! gvandy ---
Kepco 800 photos
Here are the photos. The tape with the X marks where the CAN condenser was located. and the bad transformer is marked with the Kepco #. I have since removed it and may attempt to rewind is just to see if I can. The High voltage winding requires about 2000 turns of # 38 wire. The other 4 windings will be a piece of cake. Let me know if you have either of these parts. Regards, gvandy ---
Here are the photos. The tape with the X marks where the CAN condenser was located. and the bad transformer is marked with the Kepco #. I have since removed it and may attempt to rewind is just to see if I can. The High voltage winding requires about 2000 turns of # 38 wire. The other 4 windings will be a piece of cake. Let me know if you have either of these parts. Regards, gvandy ---
Attachments
Its cool I found this thread. I just found 3 Kepco power supplies. Don't have the model #'s yet; will check. 2 are 600v 400mA and use 5 7581's as pass tubes.
The other one is a 1000v 200mA; with current as well as voltage regulation. It uses 8 (!) 8068 pass tubes.
All these appear to have never been used.
I have a question- can one replace the pass tubes with mosfets or some form of solid-state pass device? The 8068's are hard to find and pricey. Kepco makes a s.s. replacement unit for these, at...*cough* ~$1500....
Best- Kent
The other one is a 1000v 200mA; with current as well as voltage regulation. It uses 8 (!) 8068 pass tubes.
All these appear to have never been used.
I have a question- can one replace the pass tubes with mosfets or some form of solid-state pass device? The 8068's are hard to find and pricey. Kepco makes a s.s. replacement unit for these, at...*cough* ~$1500....
Best- Kent
I don't remember the number right now either (BHK 1000 -.2M ?), but I have one of those. THere are other models that use the 8068. I have one that puts out 0 to 500 volts at 400 ma and another that does 0 to 2000 volts at 100 ma. All use 8 X 8068 tubes. I got them all either at hamfests or for minimum bid on Ebay. I have not found a dead 8068 yet, but I suppose it could happen, but if your supplies were never used there should be plenty of life left.
I have seen one of these supplies modified to use a TV sweep tube. I think it was a 6CD6. The supply was for sale at a hamfest, but the guy wanted too much money for it, so I just said no.
Hi Kent: I know of no one that makes a Mosfet replacement for 8068s. Concerning my previous post above I have managed to repair the model 800 Kepco discussed above and will sell it. Make an offer and be prepared to pick it up as there is no way I would attempt to crate and ship one of these. Regards, gvandy ---
Kepco themselves sold replacements for the 8068's. "The Art of Electronics" shows a method for connecting MOSFETs in series for an HV regulator.
gvandy- thanks, but I will pass. The ones I have are 3" high. No filament power, but I got that already.
jackinnj- What page does that start at? p368; Sec 6-20; "High voltage regulators"?
jackinnj- What page does that start at? p368; Sec 6-20; "High voltage regulators"?
Does anyone have any idea how to sell, and for how much, one of these old power supplies? I have a Dressen-Barnes 62-117 made in about 1960 that works. It has two big meters and is adjustable from 0-500 V at 500 mA and a second supply 0-300 V at 300 mA (I think) and a variable 6V heater supply at 10 A. I have the manual and schematic diagram and parts list and all that.
It's on a rack panel. Runs off 105-125V line. Uses 4 6L6's in the high current supply and 2 6L6s in the smaller one, as pass tubes. Too heavy to ship; I'm in the Los Angeles area.
It's on a rack panel. Runs off 105-125V line. Uses 4 6L6's in the high current supply and 2 6L6s in the smaller one, as pass tubes. Too heavy to ship; I'm in the Los Angeles area.
Dressen-Barnes 62-117
I just got one of these. looking for a schematic and manual. also looking for a second one if anyone has any leads.
I just got one of these. looking for a schematic and manual. also looking for a second one if anyone has any leads.
- Status
- Not open for further replies.