The **AZ1-R** is a specific electronic component, typically categorized as a **Directly Heated Rectifier Diode** (Vacuum Tube). It is a classic component often found in vintage European radio equipment and high-end tube amplifiers. --- ### 1. Technical Specifications The AZ1-R is a full-wave rectifier designed to convert alternating current (AC) into direct current (DC). Below are the primary electrical characteristics: | Parameter | Value | | :--- | :--- | | **Filament Voltage ($V_f$)** | 4.0 Volts | | **Filament Current ($I_f$)** | 1.1 Amperes | | **Max. Anode Voltage ($V_{tr}$)** | $2 \times 300$ V to $2 \times 500$ V (RMS) | | **Max. Output Current ($I_{dc}$)** | 60 mA to 100 mA | | **Socket Type** | Side-contact (P-type) or 8-pin Base | | **Tube Type** | Full-wave Rectifier (Vacuum) | --- ### 2. Key Electronic Parts & Construction The AZ1-R consists of several internal physical elements that define its electronic behavior: * **The Filament (Cathode):** Unlike modern indirectly heated tubes, the AZ1-R is "directly heated." The filament acts as the cathode, emitting electrons as it glows. This leads to a faster warm-up time but requires a dedicated 4V transformer winding. * **Dual Anodes (Plates):** Because it is a "Full-Wave" rectifier, it contains two separate plates. This allows it to conduct during both the positive and negative cycles of the AC input (when used with a center-tapped transformer). * **Glass Envelope:** A vacuum-sealed glass bulb that prevents the internal parts from oxidizing and allows electrons to travel from the filament to the plates without interference from air molecules. * **The Base/Pins:** Usually features a "Side Contact" base (common in older Philips/Telefunken designs). These pins provide the connections for the AC input (anodes) and the DC output/power supply (filament). --- ### 3. Application in Circuits The AZ1-R serves as the heart of the **Power Supply Unit (PSU)** in vintage electronics: 1. **Input:** Takes high-voltage AC from a power transformer. 2. **Rectification:** The two anodes take turns conducting current, resulting in a pulsing DC output. 3. **Filtering:** Usually followed by a **Filter Capacitor** (C) and an **Inductor/Choke** (L) to smooth the pulses into a steady DC voltage for the rest of the radio or amplifier. --- ### 4. Comparison: AZ1 vs. AZ1-R While very similar, the **"R"** suffix or variations often denote: * **Ruggedization:** Increased mechanical stability for mobile or industrial use. * **Base Variations:** Sometimes used to distinguish between different pinout configurations (e.g., standard side-contact vs. specialized sockets).