Rackmount Stuff from Slim’s “Dump”

Here’s the first batch of stuff from Slim’s “Dump” — rackmount equipment that I can’t identify as being associated with anything else from out there.

Rackmount stuff from Slim's dump

I can’t tell that any of this stuff as still useful (which presumably has something to do with why it was out in the Dump in the first place), so it’s destined for disassembly, component removal, case reuse, and recycling. If there’s anything that strikes you as useful, throw a comment down below about what it’s good for, offer to pay me what it’s worth to you plus shipping costs, and I bet we can work something out. I’d love to see some of it go to someone who’d actually make use of it.

HP 13037 Disc Controller

This interests me because of the HPIB (GPIB) interface on the back — makes me want to bust out my old CBM system and see if I could get it going. But it’s not worth the effort just for curiosity.

I’m puzzled by the hole at the left end of the back. I’m guessing this was a controller for a (large) external disk drive and there’s a cable missing or tucked inside.

HP 13037 disc controller, front

HP 13037 disc controller, back

Case with Intel SBC-640 Power Supply

The blank front with RF connector and the gap in back with unplugged cables lead me to believe that something else used to be in here. The power supply reads 5V @ 10A, 12V @ 4.5A, -5V @ 1.25A, and -12V @ 1.25A. If one didn’t mind the weight of the giant transformer, it seems like it could still be a nice linear power supply.

Case with Intel SBC-640 power supply, front

Case with Intel SBC-640 power supply, upper front

Case with Intel SBC-640 power supply, upper back

Case and Panel Meters from Multi-Voltage Power Supply

Obviously stripped of its guts. I’m not sure I’m willing to part with it anyway — I really like those old panel meters.

Case and panel meters from multi-voltage power supply, front

Case and panel meters from multi-voltage power supply, top

Case and panel meters from multi-voltage power supply, rear

Sangamo Electric Co. LC-1 Line Conditioner

When I saw “line conditioner,” I thought of AC line conditioning, but that’s obviously not what this is. In fact, I don’t know what it is. 600/900Ω inputs sound familiar to anyone?

I love the fold-down front door, the card cage, and the jeweled power indicator on the right.

Sangamo Electric Co. LC-1 line conditioner, front

Sangamo Electric Co. LC-1 line conditioner, front open

General Dynamics Power Supply

This is a heavy, 23″ rackmount power supply with lovely captive rackmount screws. By the labeling of the connections on the rear, I assume it’s a floating power supply; so I’m a little puzzled by the front panel’s positive versus negative labeling of +12V @ .7A, -12V @ 5A, and -15V @ 7A.

General Dynamics power supply, front

General Dynamics power supply, rear

Power One Modular Power Supplies in Cage

Cute modular power supplies mounted to cage rails. I’m actually a little tempted to keep and use this — after replacing the terminal block covers on the left two modules, where the AC power daisy-chains across.

Power One modular power supplies in cage, front

Power One modular power supplies in cage, rear

The rightmost module is 5V @ 12A or 6V @ 12A:

Power One modular power supply in cage

And the left two modules are 12V @ 3.4A or 15V @ 3.0A.

Power One modular power supplies in cage

Custom Power Supply

This looks like a homemade Slim job. I’m a little surprised there’s no onboard regulation. I haven’t bothered to check output voltage.

Custom power supply, front

Custom power supply, interior

Maxwell Electronics Corporation 48VDC Power Supply

This adorable power supply is regrettably missing its tubes, and quite possibly more on the inside. It says it was made by Maxwell for the U.S. Department of Commerce, Civil Aeronautics Administration. It makes me wish I had a use for 48VDC (at home) so I could fix this up and have a nice warm tube glow in one of my racks.

Maxwell Electronics Corporation 48VDC power supply

Date Accepted: Jan 1959

Maxwell Electronics Corporation 48VDC power supply

7 Responses to “Rackmount Stuff from Slim’s “Dump””

  1. Tomas says:

    I like very much Power Supply with INTEL logo. See I right on PCB it is 1975? (6th photo). Great blog, you are in my feed reader. ;-)

  2. Keith Neufeld says:

    Tomas, it does look like the front panel was made (or designed) in 1975. However, I see 1979 and 1980 manufacturing dates on the TO-3 transistors (which I just noticed are manufactured by Motorola!) on the rear panel.

  3. dan says:

    Sangamo Electric Co. LC-1 Line Conditioner

    it’s likely a CO telephone line eq… he says like he knows wot he’s talking about… :>)


  4. Keith Neufeld says:

    Cort says:

    The only piece I’m familiar with is the “grey power supply.” The one with the high current negative supply in the 23″ rackmount. He had a bunch. He always called them the “grey power supplies”. They are military in origin, and built like a tank. If they break, they don’t like to be fixed.

  5. Brad says:

    If you want to try out the HP 13037 Disc Controller you could use http://www.sparkfun.com/commerce/product_info.php?products_id=549, although if you don’t know if it works $149.95 seems expensive.

    The Sangamo Electric Co. LC-1 Line Conditioner, could be for audio, or RF.

  6. Seymour Riis says:

    I used to line up those Sangamo LC-1 conditioners about 40 years ago. They was used by telephone companies and also by the military on private line analog (3 kHz) leased lines. Most of the time, they were used on long-haul circuits used by high speed modems, and we are talking 2,400 BPS to 9,600 BPS here.

    The modems of that era could not cope with the amplitude vs. frequency distortion and the envelope delay distortion that occurred on long telephone circuits. One had to pay extra for a “conditioned” circuit, and was accomplished using products such as the Sangamo and Halcyon units

    Eventually, adaptive equalizers were built into the modems themselves so the need for this product went away. When leased private lines started utilizing digital transmission end-to-end, the need for modems (and the LC-1′s) went away!

    To align these conditioners, oscillators and envelope delay test sets or TIMS boxes (Transmission Impairment Measurement Sets) needed to be used. The instruments cost about $10K a piece new back in the day.

  7. Cedar Maxwell says:

    Very interesting to see that 48VDC power supply. My grandfather was the co-founder of that company along with his brother. I have a few other items from the company, including a radio and a transformer. My grandfather has more various parts from the company at his house. The company was founded in 1958 and went out of business in 1969 after the failure of KMEC-TV, today Channel 33 in the DFW market.

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