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15: How can I connect T20 to TV?

• The 3.5mm AUX jack is the audio input. It can through 3.5mm 

  AUX input to connect your TV.

16: Why there is no voice from my amplifier?

• Please check whether the cable of power supply is connected to 
  T20 and whether the power indicator is on.
• Make sure the T20's indicator light is on when the power is turned 
  on.
• Please check that the T20 and your source components are 
  turned on and not set to minimum volume, if possible replace 
  your source and test again.
• Check that the wire connections from the audio source to each 
  speaker in the amplifier are connected correctly.
• Please check that the cable is not loose, damaged. Incomplete 
  connection is one of the main reasons for no sound.
• Please make sure the Bluetooth is paired or not, if Bluetooth is 
  connected, AUX input will be disconnected. If you want to 
  connect this amplifier with a 3.5mm AUX cable, you need to 
  disconnect the Bluetooth first.
• Please make sure that the headset is connected or not. If the 
  headset is connected, the speaker will be disconnected.

17: Which Bluetooth chip does T20 have?

• The T20 is equipped with QCC3031 Bluetooth chip, which 
  supports Apple acc and aptx.

Note:

 QCC3031 Bluetooth chip does not support apt-X LL.

18: an I use Bluetooth head phones with this unit? 

• This tube amplifier is a Bluetooth receiver, not a Bluetooth 
  transmitter. It works with 3.5mm wired headphones.

• Make sure that the positive and negative terminals of the speaker 
  outputs do not touch each other. Some of the larger banana plugs 
  can easily touch each other and cause a short circuit

10: Can I bridge channel 1 and channel 2 to get 100watts?

 

• No, this amplifier can't be bridged. 

11: Why does distortion occur?

• Because the vacuum tubes amplify the sound. If you turn the 
  sound up too loud, distortion may occur. Please try turning the 
  volume down a little.

12: Can I replace the vacuum tubes?

• If necessary, there are substitutions: EF95, 6AK5, 6AK5W, 
  403A/403B, 6J1, 6J1P, 6J2, 6J3, 6J4, 6J5 vacuum tubes, etc. You 

  can replace the vacuum tubes to DIY your stereo system.

Note: 

Please must remember switch off the power BEFORE you 

            pull out the tube, or it might damage the device.

13: Why the T20 came with a broken vacuum tube?

• Due to the long-distance, the vacuum tube may be damaged 
  during transportation. If you find that the vacuum tube is broken 
  or there is other problems, please contact our email, and we will 
  replace the vacuum tube for you.

14: Can headphones and speakers play at the same time?  

• No, when the headphones plug in, the speakers' output will be 
  interrupted.

Output priority: 
3.5mm Headphone Output > Speaker Output

Summary of Contents for T20

Page 1: ...Thanks for choosing us Fosi Audio T20 User Manual ...

Page 2: ...vacuum tube is also replace able as you like it is a fantastic amplifier that suit for your personal PC desk book room or for your home theater in your living room Bring joy and happiness to your smarter life THD SNR Max Power Output 0 04 99dB Power Adapter 24V 4 5A 50W x 2 4Ω Frequency Range 20Hz 20kHz 1 dB Input Mode Bluetooth and AUX Bluetooth Transmission Distance Up to 50ft 15m Bluetooth Tran...

Page 3: ...unctions Power Switch Indicator Light Bass Control Treble Control Volume Control 3 5mm Headphone Output Front Panel Back Panel BT AUX Mode Switch Audio Input Speaker Output DC Input Bluetooth Antenna Interface Bluetooth Antenna ...

Page 4: ... connect the speaker s wire via the bare wire or the banana plugs Or Connect a wired headset to the Headphone Output on the front panel of the T20 the speaker output will disconnect once the headset is plugged in Prepare 4 Connect the 24V power supply to the DC input Prepare 5 Turn on the Power Switch Note Before turning on the power switch of the amplifier please turn the volume button to the low...

Page 5: ...itive and negative speakers wires to contact each other which will result in no sound output How to connect the speaker wire Method 1 Bare wire connection illustration Release the horn terminals block terminals Insert the two ends of the speaker wire into the amplifier and speaker terminal holes Tighten the horn terminals Note Please make sure that the speakers wire are not attached with each othe...

Page 6: ...rce take a TV as an example a RCA cable or a 3 5mm AUX to RCA cable Step 1 Select the input mode switch to AUX on the back panel of the T20 the indicator light shows red light Step 2 Connect your TV to Audio Input via a RCA cable Step 3 Open your TV play and enjoy Troubleshooting QA 1 What type of speakers work best with T20 Amplifier Fosi Audio Amplifiers work great with any 2 8 ohm passive speak...

Page 7: ......

Page 8: ...put cables If you are not using the original factory standard power supply please replace the power supply before testing Many power supply in the market have large interference coefficient which will cause a lot of current sound Please check if the vacuum tube is completely plugged in and try to change the left and right vacuum tubes 4 My Bluetooth device cannot pair with T20 Make sure that you h...

Page 9: ...ed all the time and it is safe without power consumption 7 Sound quality is not good Make sure all the cables are fully connected Adjust the treble and bass control of the power amplifier to achieve the right tone Please try to change the sound source and cables to test Please check if the vacuum tube is broken or completely plugged in 8 Can T20 accept signal from a Bluetooth microphone Please mak...

Page 10: ...here are substitutions EF95 6AK5 6AK5W 403A 403B 6J1 6J1P 6J2 6J3 6J4 6J5 vacuum tubes etc You can replace the vacuum tubes to DIY your stereo system Note Please must remember switch off the power BEFORE you pull out the tube or it might damage the device 13 Why the T20 came with a broken vacuum tube Due to the long distance the vacuum tube may be damaged during transportation If you find that the...

Page 11: ...ted correctly Please check that the cable is not loose damaged Incomplete connection is one of the main reasons for no sound Please make sure the Bluetooth is paired or not if Bluetooth is connected AUX input will be disconnected If you want to connect this amplifier with a 3 5mm AUX cable you need to disconnect the Bluetooth first Please make sure that the headset is connected or not If the heads...

Page 12: ...s have an 18 month limited warranty on parts and labor from the date of purchase Please contact us if you have any problems About Fosi Audio Fosi Audio designs and builds innovative audio products with all your music in mind Great sound simple but elegant designs high quality materials and truly useful features are what Fosi Audio is about We sincerely hope you get as much enjoyment from our produ...

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