1. Introducció
This manual provides detailed instructions for the Nobsound 6P1 Vacuum Tube Power Amplifier, Model DJ428. This stereo Class A single-ended amplifier is designed to deliver high-fidelity audio output for both speakers and headphones. Please read this manual thoroughly before operating the device to ensure proper use and optimal performance.
2. Instruccions de seguretat importants
- Calor: Tub de buit amplifiers generate significant heat during operation. Ensure adequate ventilation around the unit. Do not place the amplifier on heat-sensitive surfaces or cover its ventilation openings.
- Font d'alimentació: Connecteu el amplifier only to a power supply of the type indicated on the unit. Ensure the power cord is not pinched or walked on.
- Humitat: To reduce the risk of fire or electric shock, do not expose this appliance to rain or moisture. Do not use near water.
- Manteniment: No intenteu fer el manteniment d'aquest producte vosaltres mateixos. Envieu tot el manteniment a personal de servei qualificat. Obrir la unitat us pot exposar a corrents perillosos.tages.
- Manipulació de tubs: Tubes can be hot. Allow the amplifier to cool down before handling or replacing tubes. Handle tubes carefully to avoid breakage.
- Col·locació: Place the unit on a stable, level surface. Keep cell phones and other electronic devices at least 3 feet away to minimize potential interference or hum.
3. Contingut del paquet
Verifiqueu que tots els elements siguin presents al paquet:
- Potència de vàlvules de buit Nobsound 6P1 Amplifier (Model DJ428)
- Vacuum Tubes (individually wrapped)
- Cable d'alimentació
- Manual d'usuari (aquest document)
4. Guia de configuració
Follow these steps to set up your Nobsound 6P1 ampmés viu:
4.1. Tube Installation
The vacuum tubes are shipped separately to prevent damage. Carefully unpack each tube and install them into their corresponding sockets. Ensure the pins align correctly with the socket holes and gently push down until the tube is seated firmly. Refer to the diagram below for tube placement.

Imatge 1: De dalt a baix view de la amplifier chassis, illustrating the placement of the vacuum tubes into their respective sockets. Ensure correct pin alignment during installation.
4.2. Connexió de fonts d'àudio
Connect your audio source (e.g., CD player, DAC, preamplifier) to the RCA input jacks on the rear of the ampamplificador amb cables RCA d'alta qualitat.

Imatge 2: Rear panel of the Nobsound 6P1 amplifier, displaying the RCA input connectors on the left and the speaker output terminals on the right.
4.3. Connexió dels altaveus
Connect your passive speakers to the speaker output terminals on the rear of the amplifier. Ensure correct polarity (+ to + and - to -) for each channel. This amplifier is designed for speakers with appropriate impedance and power handling capabilities.
4.4. Connexió d'auriculars
For headphone use, plug your headphones into the 6.35mm (1/4 inch) headphone jack located on the front panel. The amplifier supports headphones with an impedance between 32Ω and 600Ω.
4.5. Connexió d'alimentació
Connect the provided power cable to the power inlet on the rear of the amplifier, then plug it into a suitable wall outlet. Ensure the power switch on the front panel is in the 'OFF' position before connecting to power.
5. Instruccions de funcionament
5.1. Encès / apagat
- Assegureu-vos que totes les connexions siguin segures.
- Turn the volume knob to its minimum position (fully counter-clockwise).
- Flip the 'POWER' switch on the front panel to the 'ON' position. The blue LED indicator will illuminate, and the tubes will begin to glow. Allow a few moments for the tubes to warm up before playing audio.
- To power off, turn the volume knob to minimum, then flip the 'POWER' switch to 'OFF'.

Imatge 3: Davant view of the Nobsound 6P1 amplifier, highlighting the power switch, headphone jack, VU meters, and volume control knob.
5.2. Control de volum
Adjust the 'VOLUME' knob on the front panel to achieve your desired listening level. Start at a low volume and gradually increase it to prevent sudden loud sounds.
5.3. Initial Burn-in Period
New vacuum tubes and amplifier components benefit from a 'burn-in' period. During the first 50-100 hours of use, the sound quality may gradually improve and stabilize. You may notice slight variations in sound during this period.
6. Manteniment
6.1. Neteja
Netegeu el amplifier's exterior with a soft, dry cloth. Do not use liquid cleaners or abrasive materials, as they may damage the finish or internal components.
6.2. Substitució de tubs
Vacuum tubes have a finite lifespan and may need replacement over time. If you experience a decrease in sound quality, increased noise, or tube failure, consider replacing the tubes. Ensure the amplifier is powered off and cooled down before attempting to replace tubes. Refer to the tube installation section for proper handling.
6.3. Atenció general
Eviteu exposar el amplifier to extreme temperatures, direct sunlight, or high humidity. Do not block the ventilation holes. Disconnect the power cable if the unit will be unused for an extended period.
7. Solució De Problemes
If you encounter issues with your Nobsound 6P1 amplifier, consulteu els següents problemes i solucions habituals:
- Sense so:
- Comproveu si el amplifier is powered on and the blue LED is illuminated.
- Verify all audio cables (RCA, speaker, headphone) are securely connected.
- Ensure the volume knob is not at its minimum setting.
- Confirm your audio source is functioning correctly.
- Soroll de brunzit o brunzit:
- Assegureu-vos que tots els cables estiguin ben apantallats i connectats.
- Intenta moure el amplifier away from other electronic devices (e.g., Wi-Fi routers, cell phones, computer monitors) that may cause interference.
- A ground loop may be present. Try plugging the amplifier into a different electrical outlet, ideally on a separate circuit from other audio equipment.
- Inspect tubes for proper seating; reseat them if necessary.
- So distorsionat:
- Reduce the volume level from both the amplificador i la font d'àudio.
- Check speaker connections for correct polarity.
- Ensure the impedance of your speakers/headphones is compatible with the ampmés viu.
- Tubes may be nearing the end of their lifespan and require replacement.
- Intermittent Sound or Crackling:
- Gently reseat all vacuum tubes. Loose connections can cause intermittent audio.
- Comproveu si hi ha cables d'àudio danyats.
Si el problema persisteix després d'intentar aquestes solucions, poseu-vos en contacte amb l'atenció al client.
8. Especificacions
| Marca | Nobsound |
| Número de model | DJ428 |
| Potència de sortidatage | 6.8 watts x 2 |
| Compatible Headphone Impedance | 32Ω-600Ω |
| Material | Metall, plàstic |
| Color | Negre |
| Pes de l'article | 15.85 lliures |
| Dimensions del paquet | 14.8 x 11.1 x 10 polzades |
9. Garantia i Suport
For warranty information and technical support, please refer to the documentation provided with your purchase or visit the official Nobsound weblloc web. Conserveu el rebut de compra com a comprovant de compra per a reclamacions de garantia.





