Comments on: Rackmount Stuff from Slim’s “Dump”

By: Cedar Maxwell

Cedar Maxwell — Wed, 27 Apr 2022 22:54:07 +0000

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.

By: Seymour Riis

Seymour Riis — Mon, 17 Aug 2015 15:11:58 +0000

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.

By: Brad

Brad — Tue, 14 Oct 2008 23:34:01 +0000

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.

By: Keith Neufeld

Keith Neufeld — Tue, 14 Oct 2008 12:41:31 +0000

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.

By: dan

dan — Tue, 14 Oct 2008 11:54:23 +0000

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… :>)

Dan

By: Keith Neufeld

Keith Neufeld — Mon, 13 Oct 2008 15:45:46 +0000

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.

By: Tomas

Tomas — Mon, 13 Oct 2008 15:40:04 +0000

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.