Last weekend, I picked up from my favorite electronics junkyard one of these power supplies - an ECI 20500B:
Made by this company:
The picture in the auction above is virtually identical to my supply (except mine is missing the outer casing); I have verified that it seems to work properly; I had to fix a few minor issues (new binding posts, a new power switch, etc) - but it appears to work OK and no magic smoke was let out!
I am pretty sure it is an “obsolete” product; I contacted the company about it, looking for manuals (specifically the user and the service manuals), but I have yet to hear anything from them. I am mainly wanting to have this information for any future service needs, as well as to know the proper specs of the device, and to make any adjustments (there are a few trim pots on the PCBs inside, but I don’t know what controls what, and I am not going to fiddle with them until I do).
By my best guess, it has a limit of 1.5 amps MAX; at least, that’s what the inline slow-blow fuse after the main transformer (there are two; one goes to the switch and the DC convertors, the other is connected to this fuse and hook up to two legs from an AC transformer via a couple of resetable panel breakers).
There’s a fixed 5VDC output, plus a variable 0-25VDC output with setable current limits and current monitoring via the digital 7-seg LED display.
While these are the specs I know, I have found that I can’t crank the current up all the way to 1.5 amps; it will only go up to about 1.45 amps; plus it will only go up to about 24.6 or so volts on the adjustable supply. The AC output seems larger than what the front panel says its rated for (by a few volts). IIRC, the 5VDC fixed output is fairly spot-on, but I might need to re-check that.
If anyone here has a copy of these manuals, I am willing to pay a reasonable price for them or for copies.
Thank you for taking time to read this…