1. Einleitung
Thank you for choosing the Cayin MT-45MK3 Bluetooth Version KT88 Vacuum Tube Amplifier. This integrated amplifier is designed to deliver exceptional audio fidelity with its classic vacuum tube design, offering both speaker output and a dedicated headphone amplifier. It features a unique Bi-Amp mode and Bluetooth connectivity for versatile audio enjoyment. Please read this manual thoroughly before operating the unit to ensure proper use and optimal performance.
2. Wichtige Sicherheitshinweise
- Anweisungen lesen: Lesen Sie vor der Verwendung des Produkts alle Sicherheits- und Bedienungshinweise.
- Anweisungen aufbewahren: Bewahren Sie diese Anleitung zum späteren Nachschlagen auf.
- Warnungen beachten: Beachten Sie alle Warnhinweise auf dem Produkt und in der Bedienungsanleitung.
- Folgen Sie den Anweisungen: Befolgen Sie alle Bedienungs- und Gebrauchsanweisungen.
- Wasser und Feuchtigkeit: Verwenden Sie dieses Gerät nicht in der Nähe von Wasser.
- Reinigung: Nur mit trockenem Tuch reinigen.
- Belüftung: Die Lüftungsöffnungen dürfen nicht blockiert werden. Die Installation muss gemäß den Anweisungen des Herstellers erfolgen.
- Hitze: Installieren Sie das Gerät nicht in der Nähe von Wärmequellen wie Heizkörpern, Heizregistern, Öfen oder anderen Geräten (einschließlich ampKonverter (Lüfter), die Wärme erzeugen.
- Netzkabelschutz: Schützen Sie das Netzkabel vor Beschädigungen durch Treten oder Einklemmen.
- Anbauteile/Zubehör: Verwenden Sie nur vom Hersteller angegebene Anbaugeräte/Zubehör.
- Lightning/Unused Periods: Bei Gewitter oder längerer Nichtbenutzung des Geräts den Stecker ziehen.
- Wartung: Überlassen Sie alle Wartungsarbeiten qualifiziertem Servicepersonal. Eine Wartung ist erforderlich, wenn das Gerät in irgendeiner Weise beschädigt wurde.
- Vakuumröhren: Vacuum tubes generate significant heat. Do not touch them during operation or immediately after shutdown. Allow sufficient cooling time.
- Bandtage: Stellen Sie sicher, dass amplifier's voltage setting matches your local power supply (220V as specified for this model).
3. Packungsinhalt
Packen Sie vorsichtig aus amplifier and check that all items are present and in good condition. If any item is missing or damaged, contact your dealer immediately.
- Cayin MT-45MK3 Vacuum Tube AmpLifier-Einheit
- Netzkabel
- Benutzerhandbuch (dieses Dokument)
- Fernbedienung (falls im Lieferumfang Ihres Modells enthalten)
- KT88 Vacuum Tubes (pre-installed or separately packaged)

Image: The Cayin MT-45MK3 amplifier packaging box, showing the product securely packed inside.

Image: The closed packaging box for the Cayin MT-45MK3 amplifier, indicating "Vacuum Tube Integrated Amplifier".
4. Produktüberschreitungview
The Cayin MT-45MK3 is a high-fidelity vacuum tube integrated amplifier. Familiarize yourself with the various components and controls.
4.1 Frontplatte

Bild: Vorderseite view des Cayin MT-45MK3 ampVerstärker, Showcasing the four large KT88 vacuum tubes and two smaller tubes, along with the volume and selector knobs and power meters.

Image: Detailed diagram of the Cayin MT-45MK3 front panel with numbered components for identification.
- Stromschalter: Schaltet den amplifier ein oder aus.
- Lautstärkeregelung: Passt die Gesamtausgabelautstärke an.
- Left Channel Power Level Meter: Displays the output power level for the left channel.
- Right Channel Power Level Meter: Displays the output power level for the right channel.
- Kopfhörer-Ausgangsbuchse: 6.35-mm-Klinke zum Anschluss von Kopfhörern.
- Eingangsauswahl: Rotates to select between Line 1, Line 2, Line 3, and Bluetooth inputs.
- Bluetooth-Anzeige: Illuminates when Bluetooth input is selected and active.
- Vakuumröhren: KT88 power tubes and smaller driver/preamp Röhrchen.
- Tube Cage: Protective cage over the vacuum tubes.

Bild: Nahaufnahme view of the illuminated power level meters on the front panel.

Bild: Vorderseite view der amplifier with the vacuum tubes glowing during operation.
4.2 Rückseite

Bild: Rückseite view des Cayin MT-45MK3 amplifier, displaying the various input (Line 1, 2, 3) and speaker output terminals (4ohm, 8ohm).

Bild: Nahaufnahme view of the rear panel showing the RCA input jacks and speaker binding posts.
- Input (Line 1, Line 2, Line 3): RCA stereo input jacks for connecting external audio sources (CD player, DAC, etc.).
- Right Speaker Output (4ohm, 8ohm): Binding posts for connecting the right channel speaker. Select the appropriate impedance.
- Left Speaker Output (4ohm, 8ohm): Binding posts for connecting the left channel speaker. Select the appropriate impedance.
- Stromeingang: Zum Anschluss des mitgelieferten Netzkabels.
- Sicherungshalter: Contains the main power fuse.
- Bandtage Selector (if applicable): Ensure this is set to your local voltage (z. B. 220 V).

Image: Close-up showing the RCA input jacks, speaker binding posts, and the front headphone output jack.
5. Einrichtung
5.1 Tube Installation (if tubes are not pre-installed)
If the vacuum tubes are not pre-installed, carefully insert them into their respective sockets. Ensure correct orientation by aligning the pins with the socket holes. Apply gentle, even pressure until the tube is fully seated. Refer to the markings on the amplifier chassis for correct tube placement (e.g., KT88 for power tubes, smaller tubes for pre-amplifizierung).
5.2 Lautsprecheranschluss
Connect your speakers to the appropriate binding posts on the rear panel. Ensure correct polarity (+ to + and - to -). The MT-45MK3 offers 4ohm and 8ohm speaker outputs. Connect your speakers to the terminals that match their impedance for optimal performance and safety.
- For 4ohm speakers, connect to the 4ohm terminals.
- For 8ohm speakers, connect to the 8ohm terminals.
- Do not connect speakers to both 4ohm and 8ohm terminals simultaneously.
5.3 Audioquellenanschluss
Connect your audio sources (CD player, DAC, streamer, etc.) to the RCA input jacks (Line 1, Line 2, or Line 3) on the rear panel using high-quality RCA cables.
5.4 Stromanschluss
Bevor Sie das Netzkabel anschließen, stellen Sie sicher, dass amplifier's power switch is in the OFF position. Connect the supplied power cord to the power inlet on the rear panel and then to a suitable wall outlet. Verify that the voltage-Einstellung auf der amplifier (if adjustable) matches your local power supply (220V).
6. Bedienungsanleitung
6.1 Ein-/Ausschalten
- Stellen Sie sicher, dass alle Verbindungen sicher sind.
- Turn the volume knob to its minimum position (fully counter-clockwise).
- Flip the Power Switch to the ON position. The tubes will begin to warm up, and the power meters will illuminate. Allow a few minutes for the tubes to reach optimal operating temperature.
- To power off, turn the volume to minimum, then flip the Power Switch to the OFF position.
6.2 Auswahl der Eingangsquelle
Rotate the Input Selector knob on the front panel to choose between Line 1, Line 2, Line 3, or Bluetooth inputs.
6.3 Lautstärke anpassen
Slowly rotate the Volume Control knob clockwise to increase the volume. Adjust to a comfortable listening level. The power level meters will indicate the output level.
6.4 Bluetooth-Betrieb
So verwenden Sie die Bluetooth-Funktion:
- Select "Bluetooth" using the Input Selector knob. The Bluetooth indicator light will illuminate.
- On your Bluetooth-enabled device (smartphone, tablet, computer), enable Bluetooth and search for available devices.
- Select "Cayin MT-45MK3" (or similar name) from the list of devices to pair.
- Once paired, audio from your device will be streamed to the ampschwerer.

Bild: Das amplifier's input selector set to Bluetooth, with a smartphone nearby indicating a successful wireless connection.
6.5 Kopfhörer Amplifier-Modus
The MT-45MK3 features a dedicated headphone amplifier. To use it:
- Connect your headphones to the 6.35mm Headphone Output Jack on the front panel.
- When headphones are plugged in, the speaker outputs will automatically be muted, and audio will be routed to the headphones.
- Adjust the volume using the main Volume Control knob.
- To switch back to speaker output, simply unplug your headphones.
6.6 Bi-Amp Mode (One Key Switch)
The MT-45MK3 supports a Bi-Amp mode, which allows for separate amplification of high and low frequencies when used with compatible speakers and an external crossover. The "One Key Switch" functionality implies a simplified method to engage this mode, though specific details on how to activate this "one key switch" are not provided in the product description. Please refer to the specific product documentation or contact Cayin support for detailed instructions on activating and utilizing the Bi-Amp Modus.
7. Wartung
7.1 Reinigung
- Ziehen Sie immer den Stecker ampVerstärker vor der Reinigung vom Stromnetz trennen.
- Verwenden Sie ein weiches, trockenes Tuch, um die Außenflächen abzuwischen.
- Verwenden Sie keine flüssigen Reiniger, Aerosole oder aggressive Chemikalien, da diese die Oberfläche oder interne Bauteile beschädigen können.
- For vacuum tubes, gently wipe with a dry, lint-free cloth when cool. Avoid touching the glass part of the tubes with bare hands, as oils can leave residue.
7.2 Schlauchwechsel
Vacuum tubes have a finite lifespan and may need replacement over time. If you notice a degradation in sound quality, excessive noise, or a tube fails to light up, it may be time to replace them. Always replace tubes with the exact same type (KT88 for power tubes) and ensure they are matched for optimal performance. Consult a qualified technician for tube biasing if required after replacement.

Bild: Eine Nahaufnahme view of the glowing vacuum tubes, indicating normal operation.
8. Fehlerbehebung
If you experience issues with your MT-45MK3 amplifier, please consult the following table before contacting service personnel.
| Problem | Mögliche Ursache | Lösung |
|---|---|---|
| Kein Strom | Power cord not connected; Power switch off; Blown fuse; Wall outlet issue. | Ensure power cord is securely connected. Turn power switch ON. Check and replace fuse if blown (refer to fuse type on unit). Test wall outlet with another device. |
| Kein Ton von den Lautsprechern | Incorrect input selected; Volume too low; Speakers not connected properly; Headphones plugged in; Faulty audio source/cable. | Select correct input. Increase volume. Check speaker wire connections and polarity. Unplug headphones. Test with a different audio source or cable. |
| Kein Ton über Kopfhörer | Kopfhörer nicht vollständig eingesteckt; Lautstärke zu niedrig; Kopfhörer defekt. | Ensure headphones are fully inserted. Increase volume. Test with another pair of headphones. |
| Summendes oder brummendes Geräusch | Ground loop; Nearby interference; Faulty cable; Tube issue. | Ensure all components are on the same power circuit. Move amplifier away from other electronics. Replace audio cables. Consult a technician for tube inspection. |
| Bluetooth stellt keine Verbindung her | Bluetooth input not selected; Device not in pairing mode; AmpVerstärker zu weit vom Gerät entfernt. | Select Bluetooth input. Ensure your device's Bluetooth is on and in pairing mode. Move device closer to amplifier. Try unpairing and re-pairing. |
| Verzerrter Ton | Volume too high; Input signal too strong; Faulty tubes; Speaker impedance mismatch. | Reduce volume. Check audio source output level. Consult a technician for tube inspection/replacement. Ensure speakers are connected to correct impedance terminals. |
9. Spezifikationen
The following are the general specifications for the Cayin MT-45MK3 amplifier. Specifications are subject to change without notice.
| Besonderheit | Detail |
|---|---|
| Modell | MT-45MK3 |
| Röhren-Ergänzung | KT88 (Power Tubes) and smaller driver/preamp Rohre |
| Ausgangsleistung | 280W (as per product title, likely peak or total, specific RMS not provided) |
| Lautsprecherimpedanz | 4ohm, 8ohm selectable |
| Eingänge | 3 x RCA Line Inputs, Bluetooth |
| Ausgaben | Speaker Binding Posts, 6.35mm Headphone Output |
| Besondere Merkmale | Bluetooth Connectivity, Headphone Amplifier, Bi-Amp Mode (One Key Switch) |
| Stromversorgung | 220V (as per product title) |
| Hersteller | Cayin |
| ASIN | B0CT8PFMST |
| Datum der ersten Verfügbarkeit | 25. Januar 2024 |
10. Garantie und Support
Cayin products are manufactured to high quality standards. For warranty information, please refer to the warranty card included with your product or contact your authorized Cayin dealer. Keep your purchase receipt as proof of purchase for warranty claims.
For technical support, troubleshooting assistance beyond this manual, or service inquiries, please contact your local Cayin distributor or the retailer from whom you purchased the product. You may also visit the official Cayin webAuf dieser Website finden Sie weitere Ressourcen und Kontaktinformationen.





