ARMY RANK OF TECH 5

I just noticed some Army stripes have a "T" below them which I'm told indicates a special technical skill.If an individual had 2 stripes and the "T" below them, did they make more money than a regular infantryman with two stripes?If so, how much?I know that field lineman (telephone and telegraph) had these special stripes, but what other specialty codes would have had them?In the case of field lineman, how long would it have taken to get the "T" status after they came into the Army?

Sue