1. Úvod
Thank you for choosing the Nobsound EL34 HiFi Stereo Tube Amplifikátor. Tento amplifier is designed to deliver exceptional audio quality with its single-ended Class A vacuum tube design. This manual provides essential information for the safe and efficient setup, operation, and maintenance of your amplifier. Please read this manual thoroughly before using the product.
2. Bezpečnostní pokyny
- Napájení: Zajistěte ampje lifter připojen k elektrické zásuvce se správným hlasitostítage (110-120V or 220-240V, 50-60Hz) as specified on the unit.
- Větrání: Umístěte amplifier in a well-ventilated area. Do not block ventilation openings. Maintain adequate space around the unit for heat dissipation.
- Teplo: Vacuum tubes generate significant heat. Avoid touching the tubes during operation or immediately after powering off. Keep flammable materials away from the ampživější.
- vlhkost: Nevystavujte amplifier to water, moisture, or excessive humidity. Do not operate with wet hands.
- Cizí předměty: Nevkládejte žádné předměty do amplifier's openings.
- Servis: Nepokoušejte se servisovat amplifier yourself. Refer all servicing to qualified personnel. High voltages jsou přítomny uvnitř jednotky.
- Umístění: Umístěte amplifier on a stable, level surface. Avoid placing it near strong magnetic fields or other heat sources.
- Napájecí kabel: Protect the power cord from being walked on or pinched. Unplug the unit during lightning storms or when unused for long periods.
3. Obsah balení
Carefully unpack your Nobsound EL34 amplifier and check for the following items:
- 1x Nobsound EL34 AmpLifikační jednotka
- 2x EL34B Vacuum Tubes
- 2x 6H8C Vacuum Tubes
- 1x 5Z4P Vacuum Tube
- 1x napájecí kabel
Image: The Nobsound EL34 amplifier unit, displaying its dimensions and a clear list of included accessories: 1x Amplifier, 2x EL34B Tubes, 2x 6H8C Tubes, 1x 5Z4P Tube, and 1x Power Cord.
4. Nastavení
4.1. Instalace trubek
The vacuum tubes are typically packaged separately to prevent damage during shipping. Install them carefully into their designated sockets on the amplifier. Ensure the pins align correctly with the socket holes and gently push down until the tube is seated firmly.
- Identify the tube types: 2x EL34B, 2x 6H8C, and 1x 5Z4P.
- Locate the corresponding sockets on the amplifier chassis. The sockets are usually labeled or arranged in a specific pattern. Refer to the image below for guidance.
- Align the pins of each tube with the holes in its respective socket. For tubes with a keying pin (a thicker pin or a gap), ensure it aligns with the notch in the socket.
- Gently push the tube straight down into the socket until it is fully seated. Do not force it.
Obrázek: Nahoře view of the Nobsound EL34 amplifier chassis, clearly showing the arrangement of the five tube sockets where the vacuum tubes are to be installed.
Obrázek: Detailní záběr view of the individual vacuum tubes included with the amplifier: two 6H8C tubes, two EL34B tubes, and one 5Z4P tube, essential for proper operation.
4.2. Připojení reproduktorů
Connect your speakers to the appropriate output terminals on the rear panel of the amplifier. Ensure you match the speaker impedance (4Ω or 8Ω) to the corresponding terminals on the amplifier for optimal performance and to prevent damage.
- Identifikujte kladný (+) a záporný (-) pól na reproduktorech a ampživější.
- Connect the positive terminal of your left speaker to the left channel's positive terminal on the ampživější.
- Connect the negative terminal of your left speaker to the left channel's negative terminal on the ampživější.
- Repeat for the right speaker.
- Ujistěte se, že všechna připojení jsou bezpečná, abyste zabránili ztrátě signálu nebo zkratu.
4.3. Připojení zdroje zvuku
Connect your audio source (e.g., CD player, DAC, streamer) to the 'IN' RCA input jacks on the rear panel of the ampzesilovač pomocí vysoce kvalitních RCA kabelů.
- Connect the left channel output of your audio source to the 'L' (left) input jack on the ampživější.
- Connect the right channel output of your audio source to the 'R' (right) input jack on the ampživější.
4.4. Připojení napájení
After all audio connections are made, connect the provided power cord to the amplifier's power inlet and then to a suitable wall outlet.
Image: Rear panel of the Nobsound EL34 amplifier, illustrating the RCA input jacks, speaker output terminals (4Ω and 8Ω options), and the power inlet with a 5A fuse holder.
5. Návod k obsluze
5.1. Zapnutí/vypnutí
- Zapnutí: Ensure all connections are secure and the volume knob is set to minimum. Flip the power switch to the 'ON' position. The tubes will begin to glow, indicating the amplifier is warming up. Allow a few minutes for the tubes to reach optimal operating temperature before increasinobjem.
- Vypnout: Turn the volume knob to minimum, then flip the power switch to the 'OFF' position.
5.2. Ovládání hlasitosti
The large knob on the front panel controls the master volume. Rotate clockwise to increase volume and counter-clockwise to decrease it. Always start with the volume at its lowest setting before playing audio to avoid sudden loud sounds.
5.3. Zvukové charakteristiky
The Nobsound EL34 amplifier is known for its warm, rich, and detailed sound signature characteristic of tube amplifiers. It delivers firm and full mids, smooth highs, and deep bass. This amplifier is particularly well-suited for genres such as vocals, strings, pipes, and jazz, providing a natural and soft presentation.
6. Údržba
6.1. Čištění
- Always power off and unplug the ampzvlhčovač před čištěním.
- K otření vnějších povrchů použijte měkký, suchý hadřík.
- Pro odolné skvrny je potřeba mírněamp Lze použít hadřík a ihned poté suchý hadřík.
- Nepoužívejte agresivní chemikálie, abrazivní čisticí prostředky ani rozpouštědla, protože by mohly poškodit povrchovou úpravu.
- Use a soft brush or compressed air to gently remove dust from around the tubes and ventilation openings.
6.2. Tube Care and Replacement
- Vacuum tubes have a finite lifespan and may need replacement over time. Signs of aging tubes include reduced sound quality, increased noise, or uneven channel output.
- When replacing tubes, ensure the amplifier is powered off and unplugged, and allow the tubes to cool completely.
- Gently grasp the tube and pull it straight up from its socket. Avoid twisting.
- Insert new, compatible tubes following the installation steps in Section 4.1. It is recommended to replace tubes with matched sets for optimal performance.
7. Řešení problémů
Pokud máte problémy s vaším amplifier, please consult the following troubleshooting guide before seeking professional service.
| Problém | Možná příčina | Řešení |
|---|---|---|
| Žádné napájení / Jednotka se nezapne | Power cord not connected; Wall outlet not active; Blown fuse. | Ensure power cord is securely connected. Test wall outlet with another device. Check and replace the fuse (5A) if blown. |
| Žádný zvuk / Nízká hlasitost | Incorrect input/output connections; Volume knob at minimum; Faulty audio source; Damaged speaker cables; Tubes not seated correctly or faulty. | Verify all audio input and speaker output connections. Increase volume. Test with a different audio source. Check speaker cables for damage. Re-seat tubes or try replacing them. |
| Distorted sound / Hum or noise | Loose connections; Interference from other electronics; Ground loop issue; Aging or faulty tubes. | Check all cables for secure connections. Move amplifier away from other electronic devices. Try a ground loop isolator. Consider replacing tubes. |
| One channel silent or weaker | Loose speaker or input cable; Faulty tube in one channel; Imbalance in audio source. | Check and re-secure all cables for the affected channel. Swap tubes between channels to identify a faulty tube. Test with a different audio source. |
8. Specifikace
| Parametr | Hodnota |
|---|---|
| Výstupní výkon | 8 W × 2 (Ultra-linear connection) |
| Trubky | 5Z4P x1 / 6H8C x2 / PSVANE EL34B x2 |
| Frekvenční odezva | 20 Hz - 25 kHz |
| Výstupní impedance | 4Ω, 8Ω |
| Zkreslení | ≤ 1 % (1 kHz) |
| Vstupní impedance | 100 KΩ |
| Vstupní citlivost | 500 mV - 2000 mV |
| Poměr signálu k šumu (SNR) | 90 dB |
| Vstupní výkon | 110-120 V / 220-240 V / 50-60 Hz |
| Výkon transformátoru | 150 W |
| Rozměry (D x H x V) | 352 x 216 x 55 mm |
| Hmotnost | 12 kg |
| Počet kanálů | 2 |
| Typ montáže | Volné stání |
| Vyhovující specifikace | CE |
Obrázek: Interní view of the Nobsound EL34 ampoživitel, showcasing its hand-wired components and robust construction.
9. Záruka a podpora
Specific warranty information for this product was not provided at the time of manual creation. For details regarding warranty coverage, terms, and conditions, please refer to the documentation included with your purchase or contact the retailer/manufacturer directly.
For technical support, service, or inquiries, please contact Nobsound customer service or your authorized dealer. Keep your purchase receipt and product serial number handy when contacting support.