Heads up, electronics repair folks and hobbyists.
This is a genuine NEC 2SK2500 transistor.
It's in the TO-3P package, which is a common, robust through-hole package for power applications.
The part number is clearly marked 2SK2500, and it's from NEC, a well-known and trusted manufacturer in the semiconductor world.
It's a brand new, unused component.

If you're repairing an amplifier, a power supply, or any other piece of gear that uses this specific transistor, this is the exact part you need.

It's a critical component, so you want the real deal, not some counterfeit.
This is it.
It comes in its original packaging.
It's a single unit.

Get your project back up and running with this genuine NEC part.

Don't risk using a cheap substitute.
Stick with the original.
If you're troubleshooting a circuit and find a bad 2SK2500, this is your replacement.

Simple as that.
A solid, reliable part from a solid brand.
Grab one for your repair stash.