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Home / Other Components / 33×19mm Plastic Knob Tube Amp Power Amplifier Audio Potentiometer Switch Cap Guitar Volume Control Round Shaft Knob

Attributes

Brand -
Category Electronic Components Market / Other Components
Origin -
Material High-quality ABS Plastic
Dimensions 33mm Diameter x 19mm Height
Shaft Type Round Shaft (6mm standard fit)
Color Classic Black with White Indicator Line
Compatibility Guitar Amps, Audio Potentiometers, Tube Amplifiers
Weight 8 grams per unit
Package Contents 2x Knob Caps, 4x Set Screws
Finish Matte Texture for Improved Grip
Installation Slide-on with included grub screw security
Application Volume, Tone, and Gain Control

6 reviews

A

Anonymous

Mar 29, 2026

Rating: 4/5

Great for the price

Can't beat this price for two knobs. They look good and function well. One of the set screws was a little stripped, but I had spares in my toolbox.

A

Anonymous

Mar 26, 2026

Rating: 4/5

Good quality, slightly tight fit

The build quality is excellent. They were a bit tight on my potentiometer shafts initially, but after a gentle wiggle, they seated perfectly. Looks very professional.

A

Anonymous

Mar 24, 2026

Rating: 5/5

Sturdy and stylish

Replaced the broken knobs on my practice amp. These feel much sturdier than the original ones. The set screws hold them in place securely without slipping.

A

Anonymous

Mar 23, 2026

Rating: 5/5

Perfect replacement for my vintage amp

These knobs fit perfectly on my old Fender amp. The plastic feels durable and the white line is very visible on stage. Great value for the price.

A

Anonymous

Mar 16, 2026

Rating: 5/5

Exactly what I needed for my DIY project

Building a custom guitar pedal board and these knobs are the perfect size. The matte finish matches my other components nicely. Highly recommended.

A

Anonymous

Mar 10, 2026

Rating: 5/5

Classic look

These give my amplifier that classic retro look I was going for. The dimensions are accurate to the description. Fast shipping too!

5 FAQ

Q: Does the package include the screws needed to secure the knob?

A: Yes, each package includes 4 small set screws (grub screws) to secure the knobs to the potentiometer shaft.

Q: Can I use these for high-power industrial switches?

A: These are designed specifically for audio equipment like guitar amps and stereo systems. We do not recommend them for high-power industrial applications due to heat and torque limitations.

Q: Are these knobs solid or hollow inside?

A: The knobs have a hollow interior designed to slide over the potentiometer shaft, with a solid outer shell made of durable ABS plastic.

Q: What is the height of the knob from the base to the top?

A: The total height of the knob is 19mm, as specified in the product title and attributes section.

Q: Will these fit a 6.35mm (1/4 inch) shaft?

A: These knobs are designed for standard 6mm round shafts commonly found on audio potentiometers. A 6.35mm shaft may be too large for a secure fit without modification.

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