Vernitron Tachometer Generator | 18G4D AB1 B4 | P/N 9639 | 115V Input, 1000 RPM Output | New Old Stock (NOS)
Short Description:
This is a New Old Stock (NOS) Vernitron Tachometer Generator, model 18G4D AB1 B4, part number 9639. It features a 115V AC input and delivers a precise 1000 RPM output signal. This unused, factory-original unit is ideal for vintage industrial machinery, servo systems, and precision speed measurement applications.
Detailed Product Description:
Product Overview:
Discover a rare find for your maintenance and restoration projects. This Vernitron Tachometer Generator is a high-quality, precision instrument designed to provide accurate speed feedback. As a “New Old Stock” (NOS) item, it is an unused, original-manufacturer part that has been kept in storage, offering a like-new solution for legacy equipment.
Key Features & Specifications:
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Manufacturer & Type:Â Vernitron Tachometer Generator
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Model Number:Â 18G4D AB1 B4
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Part Number:Â 9639
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Input Voltage:Â 115V AC
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Output Signal:Â 1000 RPM
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Condition: New Old Stock (NOS) – This unit is brand new, never used, but may have minor shelf wear from storage. It comes in its original packaging.
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Function:Â Converts mechanical shaft rotation into a precise electrical signal for speed indication, regulation, and control.
Primary Applications:
This generator is perfect for:
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Servicing and replacing worn units in vintage industrial machinery.
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Restoring classic CNC systems, machine tools, and process control systems.
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Providing reliable speed feedback in servo mechanisms and analog control loops.
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A direct replacement part for OEM systems requiring the exact P/N 9639.
SEO & Marketing-Focused Keywords:
Vernitron Tachometer Generator, 18G4D AB1 B4, Part Number 9639, 115V Tachometer, 1000 RPM Generator, Speed Governor, New Old Stock, NOS, Vintage Industrial Parts, Servo Motor Tach, Analog Speed Feedback, Machine Tool Parts, Legacy OEM Components, Precision Tachometer, Unused Tach Generator, 115V AC Input Tach.
Why Choose This Product?
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Guanteed Authenticity:Â A genuine Vernitron component, not a modern imitation.
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NOS Condition:Â Get the performance of a new part for systems that require the original specification.
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Immediate Solution:Â Solve your downtime issues by sourcing this exact, often hard-to-find, replacement part.
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Proven Reliability:Â Built to the high manufacturing standards of its era for long-term, dependable operation.



















