No one makes new curves tracers professionally anymore?
Sure they do, it's called a semiconductor parameter analyzer, and it's basically a number of SMUs in a box with some software. The
Keithley 4200A-SCS is one example. They started replacing the curve tracers in the eighties, with units like the
HP 4142B. If you think that's expensive, start calculating the price of the Tek 575 in today's money.
You can also improvise with power supplies, but you'll often run into limitations like not going low enough in current programming or readback for the base current (for a BJT), inability to sink current, or the ability to sweep from positive to negative voltages. A SMU is basically a power supply that addresses all of these issues. It's just that they are quite a bit more expensive because they are a much more niche item and more much more complicated to design.