Transformers from Heaven! Or Brazil.

Here we are tearing up some fresh chassis yank flown in especially for the Lab via Raphael from Brazil, where the girls wear dental floss. :grin:



"But didn't you already destroy a couple of AM 16's?"
Yes. But this is entirely different.

These are out of (Raf, what are these out of again? )

Anyway, thay are full of the stickiest goop I have ever encountered. But that don't stop the show folks!
No way.

Can you spell Banded C Core?
Good.

Do C Cores usually come in high Ni?
Good. It is grain oriented.
Output cores carry a lot of flux. Which kind of steel handles more flux?
Good. You learned from all that destroyed iron.

Doc Hoyer even made some killer Peerless S-217-D outputs from a custom C Core that probably sounds better than the original.
No nickel to distort funny. Killer bass.
C cores are a superior design compared to most any lam. Especially when they are 4 mil. And they hold a gap quite nicely.

http://vacuumbrain.com/The_Lab/TA/Langevin/Raf/langevin_raf_3.jpg

cool!!! girls too.

I want to see a bloody disecction! :twisted: :twisted:

OK, this guy is playing tough, so were gonna hack it open like a fresh can of sardines.

no, its just iowa.

cj taking a picture of himself while trying to operate a hacksaw

you're a lost cause ! :green: :thumb:

Kev, your a genius! Thats exactly what I was trying. Busted. Again. By Kev, of course.

OK, no extra shield cans so it came apart like a house of cards.

Icky sticky! Raf, are you sure you aren't trying to smuggle honey oil into the country inside of Langevin transformers?



And yes, Joel, I am almost done with the Carnhills. Just have to sweep phase and excite current and their back in the box.

Out of the can. Looks like a single coil but thats just an optical illusssssion.



http://vacuumbrain.com/The_Lab/TA/Langevin/Raf/langevin_raf_5.jpg

http://vacuumbrain.com/The_Lab/TA/Langevin/Raf/langevin_raf_6.jpg

Under the lead plate. Notice the ground lead buss wire soldered to the core strap.
Any rf will go from the c-core into the strap, even though the core has a layer of coating on it.

http://vacuumbrain.com/The_Lab/TA/Langevin/Raf/langevin_raf_7.jpg

CJ, :shock: :shock: :shock:
how about going into transformer business, using your ultimate transformer knowlege and (destructive) power in building up a small transformer factory for the group to give the world back some of the hundreds and thousands fine transformers you slaughtered to transformer heaven where they are singing and playing harp as little transformer angels?

Kind regards

Martin :grin:

or make a book with step to step guide hehe.

a tittle like "how destroy a transformer and learn a lot."

good work!

I have to sleep with the corpses piled up in the corner. Sometimes late at night, I can hear them doing the midnite creep. Trying to attack. I have to put them back in their little cardboard boxes every morning, the lil devils.

Here I am, using the heat gun to get excess resisn off this mess. I also want to heat up the core so when i pop the stainless (read non-ferrous to you tweakers and add up 2 + 2) core strap, the core will pop apart like soft butter.

I bet it's a 40 from mag met, same as the AM16 outy.

Out of focus is from the heat gun messing with the camera CCD.

http://vacuumbrain.com/The_Lab/TA/Langevin/Raf/langevin_raf_8.jpg

Banding strap cut, removing wrapper:


http://vacuumbrain.com/The_Lab/TA/Langevin/Raf/langevin_raf_9.jpg

OK, were in luck!

Same exact core as the AM-16.

From the Cut-Core Catalog out of Magnetic Metals, it's a MH-40, which is a 4 mil (the cadilac of cores) steel. D-E-F-G (your local iron brain will read those numbers like a dirty novel and know exactly what your talkin about) are:

D - .500
E - .250
F - .500
G - 1.312 (1 5/16 ths inch)

Here is an original AM-16 output core next to this core:

It's nice to be able to measure original lead length, so we can heat up this header plate and sneak em out with a pair of needle nose.

Now we can pull the coil apart and map out the coil strutcure. If this bad boy is anything like it's cousin, the AM-16, we are in for a long, tedious night of split windings and bi-filar nightmares.
But hey, we came this far, so what the hay.
Pass the de-caf. Too much amperage and Langevin coils do not mix.



http://vacuumbrain.com/The_Lab/TA/Langevin/Raf/langevin_raf_11.jpg

More heat and we will pop that bottom half of the c-core out and un wrap the wrappers.
http://vacuumbrain.com/The_Lab/TA/Langevin/Raf/langevin_raf_14.jpg[

:shock:

Here's another alien, a leadmap spider, known to exist only on a small circle of islands near madagasket. We are about to split up the coils, so we need a visual record of which lead goes where for orientation purposes. After you are left with a pile of wire and cardboard, if your docs are not complete, your sunk:

http://vacuumbrain.com/The_Lab/TA/Langevin/Raf/langevin_raf_15.jpg

Typical Langevin style of manufacture, buss wire splices underneath the wrappers. That resisn is extremely tacky, requires constant application of heat to keep the un-raveling process going. The coils cool quick without the iron core inside. That middle lead splits into both coils:

http://vacuumbrain.com/The_Lab/TA/Langevin/Raf/langevin_raf_16.jpg

Now the fun part, mapping out all the splices and breakouts. You have to be very careful with Langevins. Sometimes a single lead breakout will really be two leads of wire so fine that it looks like a start or finish to a single winding. And if you snap it, you end up with an extra wire or two at the end of the reverse job. That means you shell out for more iron and start all over again. This transformer has just such a winding. Slow and easy wins the race at this stage.

http://vacuumbrain.com/The_Lab/TA/Langevin/Raf/langevin_raf_17.jpg

:twisted:
You live in an ugly world CJ. Good to know you can't hackslay this poor transformers on ebay anymore...
:twisted: :wink: :green:

Dang it, don't remind me! :evil:

Have you seen the UTC auction lately?
It's up to two pages.

OK, time to go home before I make a mistake.
I am going to need a fresh start to get this right. But the coils are ready to un-wind, so a lot of the dirty work is done with. Too punchy to start now. And happiness is something to look forward to.

Peace out. Full de-luxe. Smorgasboard city, and what the heck happened to Paul? I hope we didn't zap him.

Sorry CJ,
:? :roll:
we all like your dirty stories very much :grin: and i'm very hopeful we will see the full Langevin story soon...i saw in another thread you're already involved with pcb designs . Fine hobby we all have... :grin:
Kind regards

Martin

[quote author="smallbutfine"] we all like your dirty stories very much [/quote]

Amen..!

hohm..... I starting to get real worried about cha Chris!!

Getting high with all za tranzzforrma buzineez.......

NICE CJ! You can´t stop!

This iron is the output of that Push Pull mic preamp, the 5116b. I´ve sent you some input iron also, remenber? So that we can have the hole story on those langevin PP amps. They sound really nice. I think there is something really strange and special about that input iron. This is definetly in my best sounding list of mic transformers. On par with any UTC, triad, etc... The primary is very high inductance and very high resistance. If I´m recalling right, they use a 150 DCR winding for a 150 ohms microphone, and it´s lots of turns to get this DCR and inductance figure. And yet, it has a secondary of 60k ohms :shock: How many turns they did there??? Never seen a mic input transformer like this one. Still, it´s a small transformer.

Here is the schem:



Guilherme (from Lynx Audio) tried dissecting one of those outputs you are doing now to no avail. He didn´t heated it thought. He tried to get the compound out ofthe windings by soaking the thing in thinner. Maybe your method will get you there. I hope so!