5 out of 5
Alpha R-V38-XL Potentiometer - Alpha, Linear, 3/8" Bushing
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Product Description
Manufacturer Part Number: R-V38-XL
Standard fit for most vintage American made tube amps.
For similar pots with tighter 10% tolerances, see R-V38-10TOL-XL.
Measurements and Specs
Files
Standard fit for most vintage American made tube amps.
For similar pots with tighter 10% tolerances, see R-V38-10TOL-XL.
Measurements and Specs
| Body Depth | 11.5 mm | ||
| Body Width | 24 mm | ||
| Bushing Length | 6.5 mm | ||
| Bushing Thread | 1 MΩ version | R-V38-1ML | 3/8"-32NEF |
| 1 kΩ version | R-V38-1KL | 3/8"-32UNF | |
| 2 MΩ version | R-V38-2ML | 3/8"-32NEF | |
| 5 kΩ version | R-V38-5KL | 3/8"-32UNF | |
| 10 kΩ version | R-V38-10KL | 3/8"-32UNF | |
| 25 kΩ version | R-V38-25KL | 3/8"-32UNF | |
| 50 kΩ version | R-V38-50KL | 3/8"-32UNF | |
| 100 kΩ version | R-V38-100KL | 3/8"-32UNF | |
| 250 kΩ version | R-V38-250KL | 3/8"-32UNF | |
| 500 kΩ version | R-V38-500KL | 3/8"-32UNF | |
| Hex Nut Thickness | 2.2 mm | ||
| Hex Nut Width | 12.6 mm | ||
| Insulation Resistance | >100 MΩ at 500VDC | ||
| Life | 15,000 cycles | ||
| Manual Soldering Max Temp for 3 sec. | 350 °C | ||
| Max. Working Voltage | 500V | ||
| Max Rotational Stopper Strength | 6Kgf | ||
| Operating (Useable) Temperature | -10 °C to +70 °C | ||
| Rated Wattage (Power) | 0.5W | ||
| Rotational Torque | 20-200 gf-cm | ||
| Shaft Diameter | 6.35 mm | ||
| Sliding Noise | <47 mV | ||
| Tap Residual Resistance | ≤100 Ω | ||
| Taper | Linear | ||
| Tolerance | 1 MΩ version | R-V38-1ML | ±30% |
| 1 kΩ version | R-V38-1KL | ±20% | |
| 2 MΩ version | R-V38-2ML | ±30% | |
| 5 kΩ version | R-V38-5KL | ±20% | |
| 10 kΩ version | R-V38-10KL | ±20% | |
| 25 kΩ version | R-V38-25KL | ±20% | |
| 50 kΩ version | R-V38-50KL | ±20% | |
| 100 kΩ version | R-V38-100KL | ±20% | |
| 250 kΩ version | R-V38-250KL | ±20% | |
| 500 kΩ version | R-V38-500KL | ±20% | |
| Total Rotational Angle | 300° ±5° | ||
| Total Shaft Length | 15 mm | ||
| Washer I.D. | 9.7 mm | ||
| Washer O.D. | 16 mm | ||
| Washer Thickness | 0.4 mm | ||
| Withstand Voltage | 500 VAC for 1 min. |
| Packaging Dimensions | 1.3 in. × 1.1 in. × 1 in. | |
| Weight (Packaging) | 0.024 lbs. |
Files
| Specification Sheet for 1 MΩ | R-V38-1ML |
| Specification Sheet for 2 MΩ | R-V38-2ML |
| Specification Sheet for 1 kΩ | R-V38-1KL |
| Specification Sheet for 10 kΩ | R-V38-10KL |
| Specification Sheet for 100 kΩ | R-V38-100KL |
| Specification Sheet for 25 kΩ | R-V38-25KL |
| Specification Sheet for 250 kΩ | R-V38-250KL |
| Specification Sheet for 5 kΩ | R-V38-5KL |
| Specification Sheet for 50 kΩ | R-V38-50KL |
| Specification Sheet for 500 kΩ | R-V38-500KL |
Attention CA Residents: Prop 65 Warning
WARNING:
This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
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Customer Reviews
By MelloYellow1234
Date: December 17, 2023
Used it to slow down a Razor Dirt Quad for my 2 year old until he gets used to it. Less jerking on take off. plenty of wire length.
Rating: 
[5 of 5 Stars!]
[5 of 5 Stars!]
By Neil
Date: November 10, 2023
The metal knobs that come with it are a bit cheap feeling. Other then that great pots
Rating: 
[4 of 5 Stars!]
[4 of 5 Stars!]
By Ruben D. Porter
Date: August 08, 2023
Worked as described
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Aragorn
Date: April 29, 2023
The volume control on my Atlantic Technology subwoofer was broken and the potentiometer was frozen at 0 so there was no volume. This was the perfect replacement. I did have to take off the wires but that's not a big deal. Without this, the subwoofer would have landed in a landfill. Quality looks good; I won't be turning the volume knob much so hopefully this will last a long time.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Taylor
Date: April 29, 2023
I purchase this to wire inline to the throttle on my toddlers razor four wheeler. Works exactly as expected and seem to be very well assembled.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Jared Wilson
Date: February 13, 2023
... they worked backwards. So instead of normally it's max to the right and min to the left, that was flipped. There's a comment here advising you swap the black and yellow to resolve this and I don't know if he made a mistake or he has a weird setup but I tried it and it didn't work. So i looked up how the potentiometer works and concluded that it had to be the yellow and red that swapped to work right and I verified that is the case.
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]