A
Anonymous
Apr 12, 2026
Rating: 3/5
A Bit Tight
Functionality is fine but the fit was tighter than expected.
Description
21×12mm Plastic Knob for Tube Amp Potentiometer Switch Cap, Round Guitar Volume Control Knob
Reviews
Attributes
| Brand | - |
| Category | Musical Instrument Accessories / Guitar Electronic Accessories |
| Origin | - |
| Material | ABS Plastic |
| Outer Diameter | 21 mm |
| Total Height | 12 mm |
| Shaft Fitment | 6.35 mm (1/4 inch) |
| Color | Black |
| Surface Finish | Matte Texture |
| Package Quantity | 4 Pieces |
| Total Weight | 35 grams |
| Knob Style | Round Top |
| Compatibility | Audio Potentiometers |
5 reviews
A
Anonymous
Feb 14, 2026
Rating: 5/5
Exact Dimensions
I measured them and they are exactly 21mm as described.
A
Anonymous
Feb 08, 2026
Rating: 5/5
Great Replacement
Replaced lost knobs on my guitar pedal board. Look great.
A
Anonymous
Feb 05, 2026
Rating: 5/5
Perfect Fit for Amp
These knobs fit my vintage amplifier pots perfectly. Very happy with the size.
A
Anonymous
Jan 29, 2026
Rating: 4/5
Good Quality Plastic
Sturdy construction but required a bit of force to push on.
5 FAQ
Q: Can I buy more than 4 pieces?
A: Yes, please check our bulk listing or contact support.
Q: Is adhesive included in the package?
A: No adhesive is needed as these are push-fit knobs.
Q: Do these fit split shaft potentiometers?
A: These are designed primarily for solid shafts but may fit some split shafts.
Q: What is the return policy?
A: We offer a 30-day return policy for unused items.
Q: Are these heat resistant for tube amps?
A: Standard plastic material. Avoid direct contact with hot tubes.
![[14-Year Established Store] Tianxia Seal Carving: Integrating Seal Script Calligraphy and Seal Art, Includes Traditional Character Translations; Essential Guide for Calligraphy, Seal Spectra, and Qing Dynasty Masterpiece Analysis](https://www.gosteppe.com/cache/medium/product/107367/legacy-main-2adf1e07db89bd32388e3053.webp)
![[Pre-order Deposit Neo Eden Toys] Mengji Sweetheart Series Action Figure Blind Box](https://www.gosteppe.com/cache/small/product/269878/legacy-main-2c0235d7a3357d5860e527cd.webp)
