AXA35# What is the amperage of the Headphone Jack?

Generally;

50mW @ 32ohm, ~135mW @ 150ohm, ~150mW @ 600ohm.

Current amperage varies with the load and volume level or headphone output.

Note the formula I= Square root (P/R); where I= current (amp), P=Power (Watts). R=Load, Ohms.