I'm building a linear current regulator using 5 x TIP35C NPN Transistors, they are each rated at 25A continuous and 125W dissipation. I'm wanting a current regulation of 100A and requiring a power dissipation of around 300W.

I'm wondering about running these in parallel, I know it's quite common practice to balance paralleled transistors with emitter resistors, but due to the lack of headroom and high currents I'd rather not if I can avoid it.

Is it possible to use balancing base resistors instead of tieing all the bases together? Or will Hfe differences stuff me up.

If I do have to resort to emitter resistors - what voltage drop should I be looking at (bear in mind my total headroom is only circa 2V)

Thanks