Is there something else beside learning Tech Disciplines that can increase the Tech Aptitude?
Maybe some items: some weapon, shield or armor?

1) Starting as a Dwarf (+15 to TA).

2) Backgrounds such as Magick Allergy and Apprenticed to a Blacksmith.

3) Investing in Tech Skills (Repair, Firearms, Lockpicking, Disarming Traps).

4) Tech manuals (for sale at Tarant University) increase your tech rating in the college to which they apply, while equipped. They do stack, and are based on your IN at the time of purchase (pre-patch) or time of use (with the patch). This allows you to craft found schematics that would otherwise be beyond your ability. Note: they're rather expensive, and VERY heavy; think of the biggest textbook you ever had in college, and quadruple it.

I'm unaware of any equippable items that boost TA directly. Doesn't mean they don't exist, though.

Thanks again.