Yorbie: Episode One

Rare Transistors are not generally overly difficult to find. Basically any time there seems to be a diversion from the main path, take the side path, and there's a good chance that a Rare Transistor will be nearby.

Each level has a single transistor, and the most easy to find is on the level Down the Drain. As you're making your way through a long room with many jumps across water, there will be a small crate off to the left near the end of the room. This crate leads straight to the circular platform on which the Rare Transistor sits.

Check the video below for a visual guide: