Cayin MT-35 MK2 Vacuum Tube Integrated Amplifier

Introduction

Thank you for choosing the Cayin MT-35 MK2 Vacuum Tube Integrated Amplifier. Please read this user's manual carefully before installation and operation. The amplifier is packed with protective foams surrounding the tubes to prevent damage during transportation. Please remove these foams before installation and operation to avoid any risks.

Package Contents

Please carefully check the package first and then open it. Package contents include:

• 1. Cayin MT-35 MK2 (1 piece)
• 2. Main Fuse (2 pieces)
• 3. Power cord (1 piece)
• 4. User's Manual (1 piece)

Recommendation: Keep all packing materials for future use.

Note: Please ensure the local voltage level matches the input level indicated on the rear panel. Incorrect voltage may cause problems. Contact your local agent or Cayin if you find improper voltage.

All other parts not listed above are not included.

Product Features

• Hand-made construction with point-to-point wiring.
• Two EI output transformers with wide bandwidth.
• Specially designed toroid transformer for power supply.
• 5BK7A tubes used in the preamp stage.
• Four EL34 tubes used for AB1 push-pull amplification.
• External user Bias Adjustment with BIAS meter for monitoring.
• Headphone output jack included.
• Triode and Ultralinear selection modes.
• High-quality Japanese ALPS potentiometer.
• Equipped with an easily-installed tube cover for protection.

Safety Precautions

1. Unplug the power cord if the product will not be used for an extended period.
2. The unit may become hot after prolonged operation. Keep the ventilation open and install the amplifier in a well-ventilated place to prevent fire hazards.
3. Do not operate when the output is open or shorted.
4. Do not attempt to service the product yourself. Opening the cover may expose you to dangerous voltage or other hazards.
5. Cayin is not responsible for problems caused by unauthorized opening or servicing. For service, contact a qualified technician.
6. Do not place objects filled with liquids (e.g., vases) on or around the unit.
7. Clean only with a dry cloth.
8. Move the amplifier carefully to avoid dropping or subjecting it to strong shocks.

Important Symbols

⚠️ CAUTION: RISK OF ELECTRIC SHOCK - DO NOT OPEN

• To reduce the risk of electric shock, do not remove the cover. No user-serviceable parts inside. Refer servicing to qualified personnel.
• To reduce the risk of fire or electronic shock, do not expose the unit to rain or moisture.

⚡️ The lightning flash with arrowhead symbol alerts users to the presence of uninsulated "dangerous voltage" within the enclosure.

❗ The exclamation point alerts users to important operation and maintenance instructions.

Specifications

Maintenance

Note:

• Use a soft dry cloth to clean the chassis regularly.
• Do not use any chemicals for cleaning.

[Diagram of Cayin MT-35 MK2 front panel]

Warranty Service

1. This product is warranted for twelve months from the date of purchase.
2. Defective products must be returned to your dealer or Cayin for repair, subject to acceptance.
3. The warranty does not cover products opened by the user without Cayin's permission.

Note: The information in this manual is subject to change without further notice.

Precautions

[Diagram showing rear panel connections and AC input]

Connection of power cord: Connect the speaker cables and signal cables first, then insert the power cord into the power socket.

Note:

• Connect the power only after all other connections are finished.
• It is normal for the power transformer to become hot during prolonged operation.
• Unplug the power cord if you will not use the product for an extended period.
• Ensure the corresponding voltage is as required. Cayin is not responsible for damage caused by misuse of unsuitable voltage.

Front Panel

[Diagram 1: Front panel layout]

1. Power Switch: Used to switch the amplifier on or off.
2. Volume Knob: Used to control the volume.
3. Headphone Socket: Allows enjoyment of high-quality music with headphones.
4. BIAS Meter: Used to monitor the working current of the power tubes. The meter's backlight is on when the unit is switched on.
5. Input Selector: Used to choose between 4 audio sources. Sound is heard from LINE1 when the LINE1 indicator is on, from LINE2 when the LINE2 indicator is on, and from LINE3 when the LINE3 indicator is on.

Rear Panel

[Diagram 2: Rear panel layout]

1. Signal Input Terminal: Used for audio source input (LINE1, LINE2, LINE3).
2. Right Channel Output: Connect to the right channel speaker.
3. Left Channel Output: Connect to the left channel speaker.
4. Power Socket with Main Fuse: The main fuse is located below the power socket. Replace the fuse with the same type as indicated.

Top Panel

[Diagram 3: Top panel layout showing tubes and bias controls]

[Diagram 4: BIAS meter when not working]

[Diagram 5: BIAS meter during working, showing acceptable range]

Controls:

1. Bias Adjustment Knob for Power Tubes (A1, A2, A3, A4): Small knobs for adjusting bias.
2. Tube Positions (A1, A2, A3, A4): These positions house EL34 power tubes.
3. Bias Selector Switch (A1, A2, A3, A4): Used to select the corresponding tube for bias adjustment.
4. Tube Positions (V1, V2, V3): These positions house 5BK7A preamp tubes.
5. Triode/Ultralinear Indicator: Selects the operating state (TR: Triode Operation State; UL: Ultralinear Operation State).

Bias Adjustment Procedure:

Turn the BIAS SELECTOR Switch to the power tube you are preparing to adjust. Use a flat screwdriver to adjust the corresponding BIAS ADJ. knob. Monitor the BIAS meter on the top panel and ensure the pointer stays in the center. Bias adjustment for A1, A2, A3, and A4 should be consistent. After initial adjustment, re-check all four to ensure uniform bias levels.

Sample of Bias Adjustment for Power Tube A1:

1. Turn the BIAS SELECTOR Switch to A1.
2. Turn the BIAS ADJ. knob A1 until the pointer of the bias meter centers. Repeat for A2, A3, and A4.

Note:

• Be careful of the high temperature of the tubes during operation.
• Replace tubes carefully and correctly.
• Power tubes must be matched for optimal function.

Installation

Carefully read and follow the manual for installation:

• Do not place the machine near heat sources like radiators or heat registers.
• Keep the unit's ventilation open to avoid overheating.
• Do not expose the appliance to rain or moisture.
• Keep the amplifier at a distance that allows easy connection of cables.
• Install the amplifier steadily on a level surface, ensuring all four feet are even.
• Maintain a distance of over 15cm from surrounding walls.

Note: Please ensure the local voltage level matches the input level indicated on the rear panel. Incorrect voltage may cause problems or shorten the amplifier's life.

Tube Replacement

Audio Connection

Connect the Cayin MT-35 MK2 with other audio equipment as shown in the diagrams.

[Diagram showing connection from a CD player to the amplifier's input terminals]

Note:

• Refer to the manuals of other connected equipment during installation.
• Do not insert the power cord into the main socket before all other equipment is well connected.
• 'R' refers to the right channel, and 'L' represents the left channel.
• Follow correct connection guidance to avoid noise, poor function, or damage.
• Do not run signal cables together with power cables and speaker cables, as this can degrade acoustic fidelity.

[Diagram illustrating correct and incorrect cable connections]

Speaker Connection

[Diagram showing speaker connection to the amplifier's output terminals]

Check the impedance of your speakers:

Attach the positive terminal of your speaker to the 4 or 8 ohm terminal on the amplifier, and the negative terminal to the 0 ohm terminal. If your speakers are 6 ohm, using the 4 or 8 ohm terminal is preferential and should not cause damage to the amplifier. Connecting the left and right speakers according to the guidance ensures acoustic fidelity.

[Diagram showing banana plug and normal plug connections]

Connection of speaker cables:

1. Unscrew the terminal knob.
2. Insert the speaker cable.
3. Screw the terminal knob.

Note:

• Connect the speaker cables to the amplifier after they are well connected to the speakers.
• Connect both speakers to ensure acoustic fidelity.
• Please observe the signal direction indication on the cables.
• Do not mix up the positive and negative ends of speaker cables, as this can cause a short circuit.

Turning On

Before turning on the amplifier, ensure all connections are correct and the power supply is stable.

• Turn on the amplifier; the power LED will illuminate, indicating the amplifier is working.
• If the LED does not turn on, please contact your local agent or Cayin.
• Select the correct audio source channel and adjust the volume to your preferred level to enjoy the music.

Note:

1. While the audio system is operating, do not unplug signal or speaker cables, as this can damage the amplifier and other equipment.
2. Wait at least 2 minutes before turning the power on again after turning it off, to prevent damage to the vacuum tubes.

Small Tips

• Read the Manual: Please read the user's manual carefully before installation and operation.
• Keep the Manual: Please keep the manual for future reference.
• Warning Signs: Do not tear off or rub off the serial number.
• Operation: Perform operations as instructed in this manual.
• Parts: If using parts not supplied by Cayin (e.g., power cord, fuses), ensure they are compatible with safety requirements to avoid fire or electric shock.
• Placement: Place the amplifier on a level surface, ensuring it does not pose a hazard to children, adults, or the unit itself.
• Power: Ensure the local voltage matches the level indicated on the rear panel.
• Overload: Overloading the power socket with other equipment can cause fire or electric shock.
• Warranty Service: Do not open the product or change components yourself. Opening the cover may expose you to dangerous voltage or hazards. The warranty does not cover products opened without Cayin's permission.
• Troubleshooting: If you encounter problems, consult the troubleshooting tips. Contact Cayin if you cannot resolve the issue.

Troubleshooting

Follow these tips to keep the amplifier in optimal working condition. If you suspect a problem due to incorrect operation, check the following:

Note: Cayin is the registered trademark of Zhuhai Spark Electronic Equipment Co., Ltd.