MD 72/2 new price 118,- Euro, no tax

MD 188/II new price 118,- Euro, no tax

µ metal jackets  "magnetic shields" fitting the EI48 Übertrager new price 42,- Euro, no tax

plus shipping

The above picture could lead to the conclusion, one might be able to solder the trafo to drip´ s PCB directly. No, you can´ t. The pictures were taken to show the possibility to mount them, regarding the size.

This T 188 is built to original specs and for sale here. Bobbin with pins make it possible to mount direct to any PCB (not drip´ s !) or to connect to the Pinout PCB.

With the help of an experienced trafo winder (thanks to Enzo !) and 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".

Anyhow, reason enough to give it a go.

We deconstructed an original HAUFE T 188, to see how it was wound - arrangement of coils, interlacing, thickness of wires etc.

Static screening  as used in the original. With the start of the batch production we found proper copper strip, which works optimally in reducing capacitance. Gathering more information I used the contacts I had to people engaged with the company originally producing these parts in Usingen/Germany.

Our MD 188 MK I has 2 primary windings with 290 DCR each, 1 secondary with a center tap and a total of 590 DCR.

DC resistance is very close to that of Haufe transformers (which came in a wide range), sound is very close, too.

Lp = ~ 3,4 H (10kHz), Cp = ~ 74 pF (10kHz),  Rp = ~ 490k (10kHz)

EI 625 core material from US was tested as well. Sounds similar, but is not as smooth as the EI 48. Measured values deviate. Would ask for recalculation. Lp = ~ 1,5 H (10kHz), Cp = ~ 166 pF (10kHz),  Rp = ~ 1,5 M (10kHz)

Our MD 188 MK II is identical to MK I except the DCR, which is higher. P1: 336 Ohm, P2: 338 Ohm and S: 675 Ohm. In stock.

MD 188 MK II, incl. Pin PCB:                                                                                                             €   118,-

µ metal jacket                                                                                                                                     €     42,-

Set U73b (3 MD 188 MK II, incl. Pin PCB, 2 µ metal jackets and 1 MD72/2)                         €   506,-

plus shipping

contact: mdeppe@arcor.de

Value destructed, for the sake of gaining experience ... actual result.