Vintage ALPS Miniature Stepped Potentiometer

Dual Reverse Log (200K) | 10-Click Mechanical Detent | Genuine 1970s ALPS Japan | Vintage NOS

👨‍🛠️ Bench Verification & Technical Condition

Up for sale is a rare, premium New Old Stock (NOS) vintage 1970s ALPS Japanese-Made miniature dual-ganged stepped stereo potentiometer. This high-grade audio component features a compact 17mm miniature shell architecture with a factory-engineered 10-click mechanical detent system for precise tactile step indexing. Perfectly preserved in dry workshop storage drawers for over 50 years, this component remains entirely unused and has never been soldered or mounted.

There is 3 Available

Verified Reverse Log Track Curve: Factory stamped with the classic ALPS RDX2 series identifier. Confirmed via comprehensive multimeter sweeping to provide an authentic reverse logarithmic / reverse audio curve distribution, perfect for vintage balance and active feedback networks.
10-Click Stepped Indexing: Features a robust internal spring-loaded detent assembly delivering 10 definite, highly tactile physical clicks across the clockwise rotation tracking sweep.
Aluminium Split-Spline Shaft: Standard 6mm diameter solid aluminium split-spline shaft measuring a generous 28mm visible length (34mm total including threaded collar block). Perfect for standard push-on vintage knobs.

🔹 INDEPENDENT BENCH DIAGNOSTICS & RESISTANCE RATIOS:

- Mechanical Operation: 10-Step Detent Clockwise Rotation
- Front/Top Section (Pins 1 to 3): 200.0 kΩ Max | Click 5 Midpoint (Pins 1-2): 185.5 kΩ (Reverse Log Taper)
- Rear/Bottom Section (Pins 1 to 3): 214.0 kΩ Max | Click 5 Midpoint (Pins 1-2): 198.0 kΩ (Reverse Log Taper)

📊 Factory Component Specifications

Brand / Manufacturer	ALPS (Made in Japan)
Full Manufacturer Part Number	200KOhmRDX2
Taper Architecture Code	"RD" - Dual Reverse Logarithmic / Reverse Audio Taper Profile
Nominal Resistance Base	200 kΩ Nominal (Verified tracking up to 214.0 kΩ Max on rear track)
Architecture Layout	Dual-Ganged / Stereo Coaxial Track Configuration (Dual 3-Pin Lugs)
Casing Footprint Diameter	Miniature 17mm Outer Shielding Can Housing
Shaft Dimensions & Type	6mm Diameter \| Solid Aluminium Split-Spline Layout
Shaft Extension Measurements	28mm Visible Shaft (34mm Overall Length Including Threaded Collar)
Total Component Length	54mm End-to-End Footprint Profile (From baseboard to spline tip)
Era & Origin / Condition	Vintage 1970s Production \| Made in Japan \| New Old Stock (NOS)

📻 High-Fidelity Solid-State Audio Overhaul Target

This specialized miniature 200K stepped reverse log control is a critical resource for classic solid-state stereo repair:

Premium Integrated Amplifiers & Tuning Stages: Direct drop-in match for unique stereo balance circuits or active gain loop attenuation paths inside premium 1970s **Pioneer, Sony, Sansui, Sanyo, or Marantz** solid-state equipment.
Flawless Track Step Continuity: Pristine internal carbon tracks combined with physical step detents completely shield your circuit from input drift and crackle noise.

📮 Combined Shipping Policy

Clearing out multiple vintage assets from your workspace project bins? I will gladly manually combine shipping costs across all active listings to save you money on postage. Please add your items to your cart and request a final total before making your payment so I can issue an adjusted invoice based on the true package size and weight.

⚠️ Vintage Electronics Disclaimer

This item is a premium New Old Stock (NOS) component from an accumulation of classic workshop stock. While it has been cleanly bench-tested to confirm precise track resistance, switch continuity, and smooth tracking, vintage electrical hardware components are sold as-is without modern commercial warranties. Please review all dimensions and chassis shaft profiles closely before purchasing. Added this!!