The **6E6-R** refers to a high-frequency, power-amplifying vacuum tube (specifically a tetrode) primarily of Soviet/Russian origin. It is designed for wideband amplification and power stages in radio-electronic equipment. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics of the 6E6-R: | Parameter | Value | | :--- | :--- | | **Heater Voltage (Vf)** | 6.3 V | | **Heater Current (If)** | ~600 mA | | **Anode Voltage (Va)** | 150 V (Nominal) | | **Anode Current (Ia)** | 35 mA | | **Transconductance (gm)** | 20 - 35 mA/V | | **Input Capacitance** | ~15.5 pF | | **Output Capacitance** | ~4.3 pF | | **Socket Type** | Noval (9-pin) | --- ### 2. Functional Characteristics The 6E6-R is highly regarded in the audiophile and radio frequency (RF) communities due to several specific design traits: * **High Transconductance:** With a transconductance ($G_m$) reaching up to 35 mA/V, this tube is exceptionally sensitive. This makes it ideal for weak signal amplification. * **Secondary Emission:** The tube is often categorized as a "secondary emission" tube, designed to provide high gain even at very high frequencies (VHF range). * **Low Noise:** Its construction allows for low-noise operation in wideband amplifiers, which is why it was historically used in radar and television relay equipment. --- ### 3. Pinout Diagram (Typical) To integrate a 6E6-R into a circuit, the pin configuration is essential: ```text Pin 1: Grid 2 (Screen Grid) Pin 2: Internal Connection / No Connection Pin 3: Grid 1 (Control Grid) Pin 4: Heater Pin 5: Heater Pin 6: Cathode Pin 7: Grid 3 (Suppressor Grid) Pin 8: Anode (Plate) Pin 9: Cathode ``` --- ### 4. Common Applications * **RF Amplification:** Used in the output stages of low-power transmitters or as a driver in high-power RF systems. * **Audio Pre-amplifiers:** Due to its high gain, some boutique audio designers use it as a driver tube for power triodes (like the 300B), though it requires careful circuit design to prevent oscillation. * **Video Amplifiers:** Its wide bandwidth makes it suitable for analog video signal processing.