[Milsurplus] TCS: T-17 and RS-38 Microphone Mystery

[AKLDGUY .]

The imbalance is almost certainly caused by the manner of winding,
unless a fault has developed. When a winding is wound on top of
another, more wire is used in the outer winding for the same number of
turns. Therefore it will have a higher resistance than the inner
winding. The problem doesn't occur with bifilar winding.

73 de Neil ZL1ANM


On 12/22/15, Hubert Miller <kargo_cult at msn.com> wrote:
> I have a mic transformer here that might be from TCS. It's marked part
> number 677N213
> sez ratio pri to sec 41:1, that means each half of the CT sec is 20:1
> Oddly, i found a 400 imbalance from 1/2 the sec to the other 1/2. I
> don't know if this is an
> internal fault or what. The secondaries are around 2500 and 2800R, and
> the pri around 10R.
>
> I tended to save carbon mic transformers because i thought their high
> ratios were interesting.
> Reverse-used, they could work in a passive crystal radio to step down to
> medium low-Z
> headphones.
> -Hue Miller