The **2DP2** is a specific type of high-voltage silicon rectifier diode commonly found in vintage electronic equipment, particularly in television sets and cathode-ray tube (CRT) circuits. --- ### 1. Technical Specifications The 2DP2 is designed for high-voltage rectification, converting alternating current (AC) to direct current (DC) in high-tension environments. | Characteristic | Specification | | :--- | :--- | | **Component Type** | High-Voltage Silicon Rectifier Diode | | **Peak Inverse Voltage (PIV)** | ~2,000V - 3,000V (depending on manufacturer) | | **Forward Current ($I_f$)** | ~10mA - 20mA | | **Material** | Silicon | | **Package Style** | Axial Lead (usually epoxy encapsulated) | --- ### 2. Key Features and Construction * **High Voltage Rating:** Unlike standard 1N4007 diodes (rated for 1000V), the 2DP2 is built to handle the thousands of volts required for CRT focus or biasing circuits. * **Encapsulation:** These diodes are typically longer than standard diodes and encapsulated in thick resin or plastic to prevent high-voltage arcing between the leads. * **Silicon Junction:** Being a silicon diode, it offers a lower forward voltage drop and better thermal stability compared to older selenium or vacuum tube rectifiers. --- ### 3. Common Applications In historical and hobbyist electronics, the 2DP2 was primarily used in: 1. **CRT Televisions:** Used in the "flyback" or high-voltage section to provide stable DC to the tube. 2. **Electrostatic Air Cleaners:** Used in the voltage multiplier stages to generate the static charge. 3. **Vintage Oscilloscopes:** Providing high voltage for the trace intensity and focus. ### 4. Safety Warning When working with components like the **2DP2**, you are dealing with high-voltage circuits. Even if the device is unplugged, capacitors connected to these diodes can hold a lethal charge for extended periods. > **Tip:** If replacing a 2DP2 in a vintage repair, modern equivalents like the **2CL series** (e.g., 2CL75) or high-voltage fast recovery diodes are often used, provided the PIV and current ratings are matched. ---