Product Overview
Ten Turns of Beckman Precision, Still Wearing Its Factory Legend
Condition
The owner rates this one new, unused, and in excellent condition. The photographed sample is representative of the stock: the black cylindrical body is clean, the white legend is crisp and fully readable end to end, and the brass threaded bushing carries its hex mounting nut and external-tooth lockwasher. The plain round steel shaft shows a uniform machined finish, and the three flat solder terminals are bare, with no solder, flux, or wire remnants on them. We do not have electrical test data for this piece, so resistance, linearity, and rotational feel are not confirmed here - verify against the datasheet before use.
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Product Overview
This is a Beckman Helipot 7266, a 10-turn precision potentiometer of the kind used for calibration, nulling, and setpoint adjustment in instruments, power supplies, bridges, and control panels. The body carries the full legend in white: Helipot with the registered trademark symbol, S 7266, R200 L.25, terminal identification reading CCW and CW, and 8234, which follows the usual year-and-week date code form and reads as 1982. In Beckman's marking convention the R figure is total resistance and the L figure is independent linearity, so R200 L.25 reads as 200 ohms nominal at 0.25 percent linearity - confirm against the datasheet before you design it in. Mechanically it is a bushing-mount part: a brass threaded bushing with the hex mounting nut and external-tooth lockwasher fitted in the photos, a plain round shaft, and three flat solder-lug terminals, with the two outer lugs marked CCW and CW and the center lug the wiper in the standard arrangement. Power rating, resistance tolerance, mechanical stop and clutch details, shaft diameter, and bushing thread are not confirmed here - verify against the datasheet before use. There is more than one of these in stock, so the photographed unit is representative and the item is sold each.
Key Features
- Marked S 7266 with the Helipot registered trademark on the case
- Marked R200 L.25, which in Beckman's convention reads as 200 ohms nominal at 0.25 percent linearity
- 10 turn multiturn adjustment per our records for this part
- Case also marked 8234, following the usual year-and-week date code form
- End terminals identified CCW and CW directly on the case
- Brass threaded bushing with hex mounting nut and external-tooth lockwasher fitted in the photos
- Plain round steel shaft, uniform machined finish
- Three flat solder-lug terminals, bare and unsoldered in the photos
- New and unused per the owner, sold each from multiple pieces in stock
Applications
- A restorer bringing a 1970s or 1980s analog instrument back to life and wanting a period-correct Helipot in the panel hole instead of a modern trimmer on a flying lead
- A bench power supply or reference builder who needs fine, repeatable adjustment across ten turns rather than a nervous quarter turn on a single-turn pot
- A calibration or metrology tinkerer setting a bridge arm or divider tap where the L.25 linearity marking is the reason to reach for a precision part
- A maintenance shop stocking spares for older test gear and servo trainers that still use bushing-mount multiturn pots with solder lugs
Frequently Asked Questions
What do the R200 and L.25 markings mean?
They are the factory legend on the case. In Beckman's marking convention the R figure gives total resistance and the L figure gives independent linearity, so R200 L.25 reads as 200 ohms nominal at 0.25 percent. We are reporting the marking, not a measurement, so verify against the datasheet before use.
What is the 8234 on the body?
It follows the usual four-digit year-and-week date code form, reading as the 34th week of 1982. It is stamped on the case in the same white legend as the part number and is visible in the first photo.
Has it been tested?
No. We do not have resistance, linearity, or rotation data for this piece, and nothing in this listing should be read as a bench verification. The body legend and the photos are what we can stand behind.
Does it come with a knob or mounting hardware?
No knob appears in the photos. The photographed sample has its hex mounting nut and external-tooth lockwasher on the brass bushing, as shown in the second image. That unit is representative of the stock, so treat the hardware as typical rather than guaranteed on every piece.
What am I actually taking on if I buy this one?
You are buying an untested precision part described by the owner as new, unused, and in excellent condition, with the photos and the case legend serving as the spec. What you can count on is the identity: a Beckman Helipot 7266 marked R200 L.25, CCW and CW, dated 8234, with bare unsoldered lugs and a clean shaft. What you are absorbing is the electrical unknown, since we have not put a meter on it. If your repair or build can live with confirming the resistance on your own bench, this is a straightforward way to get a genuine 10-turn Helipot instead of a modern substitute. Shipping is a flat $8, free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
Helipot is short for helical potentiometer, the trade name Beckman built by turning one nervous knob into ten patient turns. This one has been sitting still since its 8234 marking was fresh, waiting for a panel hole and somebody's setpoint to dial in.
