You adjust the speed on a motor turntable by locating and turning specific adjustment screws, typically found under the platter or on the bottom of the device.
Adjusting the playback speed on a motor turntable is a common requirement for optimal audio performance, ensuring records spin at the correct revolutions per minute (RPM). This process usually involves manipulating dedicated speed adjustment screws.
Locating the Speed Adjustment Screws
The first step is to find the speed adjustment screws. Their location can vary depending on the turntable model and design:
- Under the Platter: Often, you will need to remove the turntable platter to access the screws located on the top surface of the main chassis or motor assembly.
- On the Bottom: Some turntables have access holes or the screws directly on the bottom panel of the device.
Consulting your turntable's user manual can provide the exact location and instructions for your specific model.
Making the Adjustment
Once you have located the adjustment screws, you can change the platter's rotation speed. Turning these screws clockwise will cause the platter to rotate faster, whereas spinning them counterclockwise will slow it down.
It's important to make small adjustments and check the speed incrementally, often using a strobe disc and light, to ensure accuracy for the desired RPM (e.g., 33 1/3, 45, or 78 RPM).
Screw Adjustment Guide
Here's a simple guide based on the screw direction:
| Screw Direction | Effect on Speed |
|---|---|
| Clockwise | Increases Speed |
| Counterclockwise | Decreases Speed |
- Note: Some turntables may have separate screws for different speeds (e.g., one for 33 RPM and one for 45 RPM), while others might have a single adjustment that affects all speeds proportionally.
Practical Tips for Adjustment
- Use the Correct Tool: Use a small, appropriate screwdriver that fits the screw head to avoid stripping it.
- Make Small Turns: Adjusting the speed requires precision. Turn the screws in very small increments (e.g., quarter turns) and re-check the speed.
- Check Speed Accurately: A strobe disc placed on the platter under a light source (like an incandescent bulb or specific strobe light) is the most accurate way to verify the turntable's speed. The lines on the disc will appear stationary when the speed is correct for the light frequency.
By carefully following these steps and using the adjustment screws, you can fine-tune your turntable's speed for accurate and enjoyable record playback.
