(Into phone) Oh yeah, I rebuilt the carburetor. It’s basically open-heart surgery for grass. (He accidentally floods the engine. It coughs black smoke.) ...That was just the engine saying hello.

(Eyes wide) High definition. You say those words, but you don’t understand their power. (He holds up the cassette) This is M4A’s ugly, arthritic grandfather. We live in the future. Why are we still listening to the past?

Sheldon acquires the G4. He sets it up in his room, connecting a complicated array of cables. The problem: the audio input is noisy. He needs a clean preamp. He goes to the only audio expert he knows: his father’s dusty stereo receiver.