Hey Lew, you must be talking about the CA-30 (or 20 I forget), the first one they made like that was the CA-20(or 10 I forget), the early series ran off a 9V and where kinda box sahped; worked great: Korg discovered that they could make them smaller, and more compact (ala credit card size) and save money ...then came to later series that ran off (2) AAA batteries. same features. That was the first *cheap*tuner that I ever ran across that actually performed well. Just a bit of trivia there.