621 - Turntable DUAL - Free user manual and instructions
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| Product Type | Turntable |
| Drive System | Direct Drive |
| Operation | Fully Automatic |
| Platter Speed | 33⅓, 45 RPM |
| Wow and Flutter | < 0.05% WRMS |
| Rumble | > 60 dB (DIN B) |
| Tonearm | Static Balance, S-Shape |
| Cartridge | Shure M91ED (or compatible) |
| Stylus | 0.4 x 0.7 mil elliptical diamond |
| Dimensions (W x D x H) | 420 x 350 x 140 mm |
| Weight | 6.5 kg (approx.) |
| Power Supply | 110/220 V, 50/60 Hz, 15 W |
| Output | RCA Phono, 5 mV at 1 kHz |
| Maintenance | Clean stylus with brush and alcohol; lubricate spindle annually |
| Safety | Do not expose to moisture; unplug when not in use for extended periods |
| Spare Parts Availability | Belts, stylus, and motor parts are still available from specialized dealers |
| General Information | Production period: 1970s; originally from West Germany |
Frequently Asked Questions - 621 DUAL
How do I set up the Dual 621 turntable for the first time?
Place the turntable on a level, sturdy surface. Remove the packing material, install the platter and belt (if applicable), balance the tonearm using the counterweight, set the tracking force to 1.5-2.0g, and connect the RCA cables to a phono input.
What should I do if the turntable does not start?
Check the power connection and ensure the switch is on. If it still does not start, inspect the drive belt (if belt-driven) or the motor. The Dual 621 is direct drive, so check the motor capacitor or wiring.
How do I replace the stylus on my Dual 621?
To replace the stylus, gently pull the old stylus forward from the cartridge body. Insert the new stylus (compatible with Shure M91ED) until it clicks into place. Ensure it is securely seated before playing.
Why is the sound distorted or muffled?
Distorted sound may be due to a worn stylus, incorrect tracking force, or dirty stylus. First, clean the stylus with a dedicated brush. If that doesn't help, check the tracking force and alignment. Replace the stylus if necessary.
How do I clean the Dual 621 turntable?
Use a soft, dry microfiber cloth to clean the platter and dust cover. For the tonearm and cartridge, use a stylus brush. Avoid using water or cleaning agents near the electrical components.
Can I use a modern cartridge on the Dual 621?
Yes, you can upgrade to a modern cartridge. However, ensure the cartridge weight and compliance match the tonearm's specifications. You may need to adjust the counterweight and anti-skate accordingly.
What is the correct tracking force for the Dual 621?
The recommended tracking force is between 1.5 and 2.0 grams for most cartridges. Adjust using the counterweight, and use a stylus pressure gauge for accuracy.
Why does the tonearm not return at the end of the record?
This could be due to a malfunction in the auto-return mechanism. Check the lever and spring under the turntable. If necessary, lubricate the mechanism with lightweight oil or consult a technician.
How do I adjust the anti-skate on the Dual 621?
Set the anti-skate dial to the same value as the tracking force. For tracking force of 1.5g, set anti-skate to 1.5. Fine-tune by playing a record with a blank section and ensuring the tonearm doesn't drift.
Is the Dual 621 compatible with a modern amplifier?
Yes, but most modern amplifiers lack a dedicated phono stage. You will need a phono preamp or an amplifier with a phono input. The Dual 621 outputs at 5 mV, which is suitable for MM phono stages.
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USER MANUAL 621 DUAL
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Product information
Brand : DUAL
Model : 621
Category : Turntable