This transformer had been built and housed long time ago inside a Neutrik module XLR barrel.
Today an orange central tripe had been painted with nail varnish, Annie No 417.
Re measuring transformer inductance:
Primary 30mH at around 1.24KHz , 55mH at around 103Hz
Secondary 20H at around 103Hz
So turns ratio should be around 1:20
The magnetic core used is a Magnetec 073 ring core, a nanoperm (nanocrystaline or glass metal) core.
This is how painting of the stripe is done:
Only the recessed area of Neutrik KMX module is painted.
Scotch 3M Magic tape is used to protect area not to be painted. So 2 stripes of it are placed on either side of machined recess valley by Neutrik and they are guided by said gap carefully while watching trough a magnifying lens placed close to the module. Tape must not be pressed firmly or it may brake while removing it.
The nail polish color container is shaken before use. A thick layer is attempted in one layer go, visiting with the small paint brush the nail polish color container about 3 times.
The Neutrik barrel is somehow rotated afterwards in an attempt to distribute more evenly the paint.
The scotch tape must be carefully removed almost immediately, before paint starts hardening. While paint is very wet, uncured, no traces of the tape will be left by the self healing diffusion (entropy) of the wet paint varnish.
If things do not go well paint can be removed with methylated spirit.
It things go well it is time to rotate it a bit more by hand in a careful way.
It has to rest for at least 24 hours on a clean from dust area. The whole Neutrik module can rest on the male part NM3MXI which has a flat surface.
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