Cold cathode indicator glow tube | neon | 35mA | 200V | MTX-90

Technical Specifications:

Cathode: Cold, oxide-coated

Filling: Neon

Envelope: Glass cylinder

Leads: 3 wire contacts

Operating position: No restrictions (operates in any orientation)

Maximum anode voltage: <200 V

Current limits:

Relay mode: up to 35 mA (amplitude), up to 7 mA (average)

Trigger mode: up to 4 mA (amplitude), up to 2 mA (average)

Discharge ignition voltage (anode-cathode): <150 V

Service life:

Trigger mode: >4000 hours

Relay mode: >5000 cycles

Control signal voltage: 1.5 V – 15 V

Recovery time: >800 μs

Luminance intensity: >80 cd/m²

Viewing angle: >60°

Color: Bright orange-red (neon)

Functions:

Controlled glow activation with a low-voltage pulse

Operates as a low-power pulse switch or indicator

"Remembers" the on state – can be used as a simple logic latching device

Emits visually bright glow – visible status even in poor lighting

Suitable for indicator panels, retro equipment, control panels

Applications:

Digital or logic indication in old systems

Pulse signal control based on relay principle

Visual indication in electrical panels

Restoration of retro technology (synthesizers, computers, counters)

Decorative electronics projects

Simple automation systems (voltage switching)

Advantages:

Signal-controlled – suitable for simple logic systems

Bright glow – highly visible

Operates in any position

Durable (thousands of hours)

Suitable for both professional and hobbyist use

Easy to use with minimal additional circuitry

Disadvantages:

Not suitable for high-power or high-voltage circuits

Requires some electronics knowledge for integration into control systems

Somewhat sensitive to overloads – current limiting protection needed

Not recommended for installation without a protective cover (glass is fragile)

MTX-90 is an excellent choice if a simple, visually appealing, and functional solution is needed for signal indication or low-power switching. This radio tube is a versatile component that finds its place in both retro electronics and modern creative projects. Due to its ability to "remember" the state, it can simplify the logic of simple control systems, and its bright orange glow makes it an excellent indicator point even in a dark environment.