Britannica Sources used in this answer

transistor - Commercialization

How many transistors did the Regency TR-1 radio use?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

NMOS transistorNegative-channel metal-oxide semiconductors (NMOS) employ a positive secondary voltage to switch a shallow layer of p-type semiconductor material below the gate into n-type. For positive-channel metal-oxide semiconductors (PMOS), all these polarities are reversed. NMOS transistors are more expensive, but faster, than PMOS transistors. — transistor NMOS transistor
Negative-channel metal-oxide semiconductors (NMOS) employ a positive secondary voltage to switch a shallow layer of p-type semiconductor material below the gate into n-type. For positive-channel metal-oxide semiconductors (PMOS), all these polarities are reversed. NMOS transistors are more expensive, but faster, than PMOS transistors.

The Regency TR-1, which was the first transistor radio manufactured in late 1954, used four germanium junction transistors in its multistage amplifier circuit.1