For those under 50...

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Dennis Alwon said:
What did you take it from?
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It came out of a church built about 1963. Sanctuary lighting dimmer. Ward Leonard Radiastat Dimmer. Motor driven rotary autotransformer. 55 amps per pole incandescent @120v. We replaced all lamps with LED a couple years ago and finally got the okay to remove this.

35A/pole for other loads, although IDK what other loads that would be.

Is there any value or use for these now? Other than boat anchor or scrap pile.
 
180316-1317 EDT

ptonsparky:

Circa 1958 I did some work for a family friend. He had a main business as a manufacturers rep of electrical components. He also had some partners in a business making dimmers. This predates SCRs.

His dimmers were based on a special Superior Electric Powerstat, nonlinear winding for incandescent dimming. He added a Slow-Syn motor for remote control, and had me design a control circuit for this.

I don't know what a Ward Leonard Radiastat is. If a variable autotransformer, then use as a dimmer, or with added circuitry for a constant voltage supply to the shop.

A variable autotransformer (Variac) is a better dimmer because there is no RFI.

.
 
ptonsparky said:
Two of the over 50 crowd knows what is. They used slightly different names. I had to research it.
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So, who was the other :D?

Powerstat (Superior), Radiastat (WL), Variac (generic) etc. Those were common for auditorium lighting control in the late 1950's and into the early 1970's. Often motor operated, sometimes with a bypass contactor to take the lights up full in an emergency.
 
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180316-2042 EDT

Variac was originally a trademark name created and owned by General Radio. See https://en.wikipedia.org/wiki/General_Radio . This does not say whether a variable autotransformer of the type created by General Radio existed previously.

Also see https://en.wikipedia.org/wiki/Autotransformer .

Sometime after the middle of the 20th Century General Radio became less of an equipment source for me. I have their LRC bridge, multi decade resistor box, potentiometer box, and various standard capacitors. I probably bought more HP stuff than any other instrument source. But I have not found HP to have stood up as well as it should have.

Few people know that Variac is a trademarked name and still is.

.
 
zbang said:
So, who was the other :D?

... Variac (generic) etc.
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"Close, but no cigar." (TM).
Variac(R) started out as and still is a registered trademark, currently owned by ISE. It is only generic in the sense that Kleenex(R) is generic for facial tissue.
see http://www.variac.com/staco_Variabl...9dXcG2hbySLZbS7FQCFin4GpCM8VG4lYaAjvwEALw_wcB

BTW, I thought it looked like a variable autotransformer, but I am 72, so I did not reply. Did not know what it was used for though, just that it was motorized for remote control.

Our much smaller church had 40 year old dimmable flluorescent fixtures with a separate constant voltage feed to the filaments. Wall box mounted Variacs (R) with a microswitch at the low end of travel to turn power off completely.
 
Never saw anything like that before. Still see Variacs mounted in wall boxes with a knob, probably still popular in recording studios. Then there were Variacs directly coupled to a Slo-Syn stepper motor for remote control. That's about it.

-Hal
 
ptonsparky said:
I used this thing for weight in my Tacoma for the last month. Sold it for scrap yesterday. 206 lbs.

I’m thinking Tahiti and those fancy water bungalows are in my distant future.




Very distant, I got $13.50 for it.
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Now you just need to find 999 more of them and you go on your vacation:D
 
Had you been physically closer I'd have paid you at least $25 :)

I may have been able to use it as a variable power supply for some motor test work.

-Jon
 
ptonsparky said:
Had I been closer I would have delivered it free. Made me a bit sick to sell it for scrap.
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What will make you sicker is knowing that for the month you carry it around in the back of your truck that extra weight probably cost you more than $13.50 in gas.

It is interesting though to see Legacy equipment like that... What replaced it? Do they still make that unit, and if so, how much would it cost now? (even New Old Stock or refurbished)
 
gar said:
180421-0841 EDT

ptonsparky:

You could have made a line voltage regulator.

.
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I could have, but I have a shop full of small experiments now, let alone a 200 lb one. Especially one with far more power than incorrectly testing GFCIs.

I scrapped three VFDs for the al heat sinks. Anyone in the market for some rectifiers and SCRs? I have the caps too. I want to see what the output of the rectifiers looks like on 1ph first.
 
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