The 6E1P is a Soviet-manufactured, glass, noval-base (9-pin miniature) electron-ray indicator tube, commonly known as a "magic eye." It is designed to provide visual indication of resonance in radio receivers for correct tuning. This tube serves as a direct functional equivalent to the 6BR5 and EM80, offering a distinctive visual display for signal strength or tuning accuracy.

Primarily intended for superheterodyne radio receivers, the 6E1P features a unique display with a horizontally oriented fluorescent green target that produces a triangular "shadow" opening from the center outward. As the signal strength increases or the control grid voltage becomes more negative, the dark area narrows, providing a clear and precise visual tuning indication. Beyond radio applications, it is also suitable for use as a recording level indicator in tape recorders, as well as in various measurement instruments and audio equipment where a visual indication of voltage levels is required.

The 6E1P is physically distinguished by its miniature 9-pin noval base (B9A) and a compact glass envelope with a horizontally oriented display window. Its design differs from earlier octal-based magic eye tubes such as the 6E5S, offering a smaller footprint and a distinctive triangular shadow pattern that expands and contracts with signal strength. The rich green glow and responsive visual feedback make the 6E1P a highly desirable component for restoring vintage European and Soviet radio receivers, as well as for adding a classic visual element to custom audio projects.

Technical specifications:

• Heater voltage: 6.3 V
• Heater current: 300 mA
• Anode voltage: 250 V
• Target voltage: 250 V
• Control grid voltage: 0 to -15 V
• Anode current: 6 ± 1.5 mA
• Target current: 0.8 to 1.5 mA
• Sensitivity: 0.7 to 1.6 mA/V
• Minimum operational lifespan: 500 hours