Product Overview
High-Brightness Industrial Glow Bulb with Built-In Resistor for 120V Line Service
Condition
Unused new old stock (NOS). Stamped markings on base collar: NE-51H. Metal bayonet shell is clean with light patina from long-term storage. Single central bottom solder contact intact. Sold each.
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Product Overview
Built in a T-3 1/4 envelope with a standard BA9s single-contact miniature bayonet base, this Radion NE51H-R high-brightness neon glow indicator lamp integrates a 47 kΩ series resistor directly inside the base shell. It connects across 105-125 VAC line power to deliver clear visual status monitoring without requiring an external dropping resistor.
Key Features
- BA9s single-contact miniature bayonet base with 9 mm diameter
- Internal 47 kΩ series resistor for direct connection to 105-125 VAC or 120-150 VDC circuits
- High-brightness neon discharge element producing an orange-red glow
- T-3 1/4 clear fluted cylindrical envelope
- Nominal design current rating of 1.2 mA
- Single insulated base contact terminal with dual retention pins
Applications
- Restoring vintage audio amplifiers, tube guitar amps, and communications equipment pilot lights
- Servicing industrial control panels, test equipment, and legacy instrumentation requiring 120V bayonet indicators
- Building custom bench power supplies and maker control consoles that need low-draw AC line status indicators
Frequently Asked Questions
Does this lamp require an external dropping resistor?
No. The lamp incorporates an internal 47 kΩ series resistor inside the metal bayonet base, enabling direct connection across 105-125 VAC or 120-150 VDC lines without adding external current-limiting components.
What supply voltage does this lamp operate on?
This lamp operates directly from 105 to 125 VAC line power or 120 to 150 VDC, drawing a nominal design current of 1.2 mA.
Can this lamp replace an ANSI B2AR indicator?
Yes. The NE51H-R shares the T-3 1/4 envelope, BA9s miniature bayonet base, internal 47 kΩ resistor, and high-brightness neon element specified for ANSI B2AR indicators.
Neon pilot lamps were the original power-on reassurance long before LEDs took over the panel face. Twist this one into the bayonet socket, flip the main toggle, and let that warm neon glow show the circuit is alive.
