Stancor RT 4012

[wb6kwt]

Can anyone provide the hook-up info on this transformer? I found it in the 1961 Stancor catalog but nothing about the leads. It appears to have two different windings on the primary side. On the secondary side there are six leads. I'm sure two of those are center taps. I've put an ohm meter on what I think is the primary but they appear to be open.

Any help?

Thanks,

Bob
wb6kwt

[W2PFY]

Sometimes if not most, the leads are color coded. Black is usually the primary and the list goes on.

Post the colors, maybe someone on here has the code for you.

[wb6kwt]

There are no "real" leads coming off the transformer, the windings come out as a bare wire. I'll see if I can post a picture this afternoon. The transformer is a low voltage type with windings of around 35V, per the Stancor catalog and weighs about 35lbs. I'm hoping to use it to build up a 28V supply.

Bob
wb6kwt

[W2PFY]

Cool, I guess I shouldn't have to remind you about your ohm meter settings but maybe your using a setting that is too low or too high and perhaps that's why you not getting a reading on the primary. You could take a 6.3 volt transformer and hook it up to the winding that has the lowest reading and then read the other taps or wires. Maybe this way would give you some understanding of the transformer. My apologies to you if you have a PHD in electronics and know your ohm meter inside & out 

[W3GMS]

Bob,
Here is a Stancor Catalog from 1961 and on page 16 you will see your transformer listed.  At least you will know what the secondary voltage and current range are for your transformer.  They mention Stancor Bulletin 518R which shows wiring diagram hook-up to produce various voltages.
Joe, W3GMS


http://www.clarisonus.com/Archives/Trans/Stancor61.pdf

[wb6kwt]

Joe,

Thanks, I had that info, wish I would find that bulletin though.

Bob
wb6kwt

[KE6DF]

It turns out that some of those RT type transformers are still in production.

I found the following docs on the www.stancor.com web site.

RT1.pdf is a spec sheet for the ones still in production.
RT2.pdf is a connection diagram document.

Hopefully this will help you figure out your tranny.

It should make a nice 28 volt supply.

Dave

[W3GMS]

Your welcome Bob...

Dave,
What I remember about the RT series is the configuration are the same.  Just various voltages and currents so your PDF attachement might indeed help Bob. 

Joe, W3GMS

[KE6DF]

In looking at the documents I posted,  along with the 1961 catalog, it appears that the RT-4012 is a 12 amp version of the RT-408 -- which was in both the 1961 catalog and the connection document and modern spec sheet..

Somewhere along the line, Stancor must have dropped the 12 amp version.

But I'm hoping pin outs will be that same for both the RT-408 and the RT-4012.

Dave

[wb6kwt]

Dave,

I think you hit a home run with this information. The 4012 has only 6 leads on the primary side but now I have something to work with. At first I thought the side with the most leads was the secondary but later found some faint markings that showed it was the primary.

Thanks very much for finding this info, I never thought to look at their site, since this is an old transformer. I bought this thing 20 years ago at a surplus store in Oakland, Ca.

Bob
wb6kwt