The T188 Transformer

[opacheco]

Hi,

I found the following data (here in technical docs) for the T188 Transformer used in the TAB U73:
-----------------
Haufe T188

Coil body EI 48/21 two chambers

Right chamber
515 turns 0.06 silk copper enamel wire
Copper foil
1030 turns 0.06 silk copper enamel wire
Copper foil
515 turns 0.06 silk copper enamel wire
Insulation
Left chamber
same, wound in opposite directions
-------------------

Do someone know what kind magnetic material was use for this EI 48 transformer laminations?
Was this a common FeSi magnetic material or special magnetic meterial?
Is possible found any supplier for or similar?

Thanks
opacheco.

 

[Murdock]

Pretty sure it’s the same lams as the V72 output transformer. And that was some kind of mumetal. Not that high nickel content as V72/76 input transformer but I think something like 40%. Maybe our member @flatresponse knows more as he analyzed original ones and sells a new version.

https://www.manfreddeppe.de/english-1/for-sale/

 

[opacheco]

Pretty sure it’s the same lams as the V72 output transformer. And that was some kind of mumetal. Not that high nickel content as V72/76 input transformer but I think something like 40%. Maybe our member @flatresponse knows more as he analyzed original ones and sells a new version.

https://www.manfreddeppe.de/english-1/for-sale/

Murdock, Thanks for your response and comment.

In the Manfred Duppe website (your attached link) say:

"...one of the rare german sources of EI 48 mumetal core material still being produced in Germany we were able to develop a replica of the venerable T188...Grading has changed over time, but this material is something in between "Dynamoblech IV", the old (pre WWII) core material for transformers and a modern equivalent. I doubt, the old "german gun - material" does in fact produce the desired "sound"..."

Your comment look like very similar to the Manfred Duppe data there.

1-What will be the original T188 EI48 lams thickness?,
2-How we can to know the Mu-metal (nickel–iron soft ferromagnetic material) exactily alloy for this T188?, Do exist any kind of test for?

Thanks
opacheco.

 

[opacheco]

The Sowter V72 transformer data show a "100% Mumetal" core but I don´t know what this means?. I know Mumetal is a Nickel-Iron alloy and the percentage say the quantity of Nickel in there: Do the 100% Mumetal means a alloy 100% Nickel and 0% Iron ??

Thanks,
opacheco.

 

[opacheco]

Any other comments?

Thanks
opacheco

 

[gyraf]

Stray thought:

..these places where you go to get your gold or silver checked for purity, don't they use something like a xray-spectrometer to get you exact percentages of a variety of metals with like three-digit precision? Could they perhaps as easily identify other metallurgic combinations..?

/Jakob E.

 

[Murdock]

Maybe @CJ knows the lam composition of the V72 output transformer.

 

[dmp]

The Sowter V72 transformer data show a "100% Mumetal" core but I don´t know what this means?

Do the 100% Mumetal means a alloy 100% Nickel and 0% Iron ??

Mu-metal has different compositions but is Nickel, Iron, Molybdenum... described here
It's main characteristic is exceptionally high magnetic permeability but it is also a soft alloy.

 

[opacheco]

Mu-metal has different compositions but is Nickel, Iron, Molybdenum... described here
Its main characteristic is exceptionally high magnetic permeability but it is also a soft alloy.

dump,
Nice info, thanks a lot.

What do you believe the Mumetal percent you say these german vintage kind of transformers was made? I am thinking to built some of them but I need this info (and another info) in order to do near as possible replicas.

Thanks
opacheco

 

[CJ]

There was a member here that had access to a spectrometer, I forget his name, I believe he lived in Germany and worked at a steel mill or something like that.

Moby might know something those lams.

Here are some inductance tests>

https://groupdiy.com/threads/lamination-experiment-3-v72-iron.51798/