TR-03

PNP AUDIO HIGH POWER TRANSISTOR - The International Rectifier TR-03 is a vintage Germanium PNP power transistor packaged in a classic heavy-duty TO-36 metal canister style (often referenced cross-compatible with TO-3 or similar stud-mount packages).Historically used as high-power audio outputs or industrial switching components, these vintage semiconductors are sought after today by electronics hobbyists and audio restorers.Core Technical Specifications & IdentificationBecause International Rectifier (IR) manufactured these decades ago, exact datasheets are often cross-referenced via older replacement systems:Material Type: Germanium (Ge)Polarity: PNP Bipolar Junction Transistor (BJT)Industry Substitutes: Commonly cross-referenced or replaced by classic industry standard parts such as the NTE105 or ECG105.Primary Applications: Vintage high-power audio amplification, power supply regulation, and early solid-state power switching