Wiring Connection Diagram for Kepco HB4AM Power Supply

[Joe Curry]

To the Boatanchor Crew:

I have just become the proud owner of a Kepco power supply that I want to
use as a bench supply for my BA gear. It has vacuum tube voltage regulators
(7581s).

The Model Number is HB4AM. There is a 14 terminal block on the rear of the
unit with many screws missing . Something was once connected here, but what
I can't tell. I don't have any information on what terminals should be
jumpered together, just the output and the 117vac line input. I know there
are internal links to the regulator, sense circuits, etc. I have tried the
Kepco website, which is unusually good and has never failed me in the past,
but they don't have any info on this model.

I would love to at least get a connection diagram and ideally an operating
manual. I'm glad to pay copying and shipping costs. If any of you have such
a beast in your possession, I'd surely appreciate the info.

Thanks and 73,

Joe
K3ICO

[Roger and Ute Brown]

Joe,

Open it up and look to see what connects to the screw-terminals. You can
trace the wiring back from the terminals and see where they come from -
obviously, that will tell you what's on the screw terminals (voltages,
inputs, outputs, etc., etc.). Even without a schematic you should be able
to trace the thing without any difficulty. Should be a rather straight
forward deductive inspection - unless I missed something in what you were
trying to say. I would think all you'd have to do is power the thing up and
measure to see what's at the terminals, if nothing else.

Roger, KL7Q

Post by Joe Curry
I have just become the proud owner of a Kepco power supply that I want to
use as a bench supply for my BA gear. It has vacuum tube voltage regulators
(7581s).
The Model Number is HB4AM. There is a 14 terminal block on the rear of the
unit with many screws missing . Something was once connected here, but what
I can't tell. I don't have any information on what terminals should be
jumpered together, just the output and the 117vac line input. I know there
are internal links to the regulator, sense circuits, etc. I have tried the
Kepco website, which is unusually good and has never failed me in the past,
but they don't have any info on this model.
I would love to at least get a connection diagram and ideally an operating
manual. I'm glad to pay copying and shipping costs. If any of you have such
a beast in your possession, I'd surely appreciate the info.
Thanks and 73,
Joe
K3ICO

[k***@gmail.com]

Post by Joe Curry
I have just become the proud owner of a Kepco power supply that I want to
use as a bench supply for my BA gear. It has vacuum tube voltage regulators
(7581s).
The Model Number is HB4AM. There is a 14 terminal block on the rear of the
unit with many screws missing . Something was once connected here, but what
I can't tell. I don't have any information on what terminals should be
jumpered together, just the output and the 117vac line input. I know there
are internal links to the regulator, sense circuits, etc. I have tried the
Kepco website, which is unusually good and has never failed me in the past,
but they don't have any info on this model.
I would love to at least get a connection diagram and ideally an operating
manual. I'm glad to pay copying and shipping costs. If any of you have such
a beast in your possession, I'd surely appreciate the info.
Thanks and 73,
Joe
K3ICO

Joe,

I was in fourth grade when you posted this, so please excuse my late reply! I have the same unit and I have been doing some reverse engineering on it. Just in case anybody else is looking for information on this same unit, I'll post my findings. I'm pretty early on in the effort, but here is what I know:

Terminals 1-2: Jumpered together (US, 110VAC)
Terminal 3 - Neutral (AC Plug)
Terminal 4 - Line (AC Plug)
Terminal 5 - Earth ground (AC Plug)
...
...
Terminal 11: Output -
...
Terminal 13: Output +

That said, I found a pricing catalog (linked below) which says this unit is voltage/current programmable. I'm not sure if the other terminals achieve this, but I would guess if the device has this capability, they would.

http://lcweb2.loc.gov/master/mbrs/recording_preservation/manuals/Kepco%20Catalog%20(Oct.%201964).pdf