Product Overview
Beckman Helipot Model A 10-Turn Precision Potentiometer, 50K Ohm New Old Stock
Condition
Unused new old stock. The gloss black case is clean, with crisp white factory markings reading Model A R50K L.25, Helipot, Beckman Instruments, Inc., and CW and CCW stamped at the terminal rows. The three gold-toned solder lugs are bright and untouched, the stainless shaft and brass panel bushing show no wrench marks, and a circled factory inspection stamp is still visible on the top face. One unit available.
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Product Overview
The Beckman Instruments Helipot Model A R50K L.25 is a 10-turn helical precision potentiometer rated at 50,000 ohms. Ten full turns of the stainless steel shaft sweep a nichrome wire resistance element, giving far finer resolution than a single-turn pot for calibration and precision analog control work. It carries a 5 watt power rating with a resistance tolerance of ±3%, mounts through a panel with a threaded brass bushing, and terminates in insulated solder lugs marked CW and CCW so the wiring direction is never in doubt. The unit photographed keeps its original inspection stamp and the locating pin beside the bushing that stops the body turning in the panel.
Key Features
- Resistance: 50,000 ohms (50K)
- Adjustment: 10-turn helical for high-resolution settings
- Element: nichrome wire, insulated construction
- Power rating: 5 watts
- Tolerance: ±3%
- Shaft: stainless steel, 0.25 inch diameter, 0.5 inch length
- Terminals: solder lugs, marked CW and CCW on the case
- Mounting: panel mount with threaded bushing and locating pin
Applications
- Calibration technician replacing a drifted adjustment pot in a legacy test set
- Lab engineer building a precision voltage divider for an analog measurement rig
- Restorer keeping vintage instrumentation original, right down to the panel controls
- Analog synth or audio experimenter who wants ten turns of fine control instead of one
Frequently Asked Questions
Is this a true 10-turn potentiometer?
Yes. The Model A is a 10-turn helical design; the wiper travels the full 50K range across ten complete rotations of the shaft.
Will a turns-counting dial fit the shaft?
The shaft is 0.25 inch diameter, the common size for turns-counting dials. Confirm your dial's bushing and depth requirements against the 0.5 inch shaft length before ordering.
What are the power rating and tolerance?
5 watts, with a resistance tolerance of ±3%.
Has the resistance been bench-tested?
This unit is unused new old stock and we have not published a measured value. If you need a bench measurement before buying, ask and we will put a meter on it.
Why buy one pot here instead of a bulk lot on eBay or Amazon?
Because you likely need one, not ten. PartsMine sells exact quantities, so a single Helipot for a repair or prototype costs what one part should. Shipping is $8 flat rate, free over $28, and the total usually lands well under a forced-quantity lot. Same or next business day shipping from Idaho.
Ten turns instead of one is how analog engineers bought precision before digital encoders existed. Thread this Helipot into your panel and take the fine adjustment back into your own hands.
