Tech Support Biasing the CA-160



Disclaimer of Liability

Under no circumstances does Canary Audio assume liability or responsibility for injury or damages sustained in biasing this equipment or for damages to any other equipment connected to it.

Even though we provided the procedures, we suggest that these adjustments to be performed only by an authorized Canary Audio dealer or repair center as an incorrect bias setting can cause damages to the tube and to the amplifier.
 
Tools Required

Digital multimeter
Long-handled slotted screwdriver
 
Procedures

To check and adjust the bias voltage of the EL34 / 6CA7 tubes, simply follow the following procedures:
  1. Making sure that the power switch is in the OFF position.


  2. Install all the tubes to the corresponding sockets using a gentle rocking motion.


  3. Connect your speaker leads, input cable and power cord to each amplifier.


  4. Turn ON the amplifier.


  5. Turn on the multimeter. Select the section for measuring up to 20V DC. Attach and secure the negative test lead to the chassis or to the binding post.


  6. Start from the EL34 - V5, insert the positive test lead into bias test point next to the EL34 - V5 tube socket.


  7. Carefully insert a long-handled slotted screwdriver into the bias adjustment pot next to the EL34 - V5 tube socket. Slowly rotate the screwdriver to adjust the bias voltage until it reaches 0.35V.


  8. Repeat steps 6 and 7 to adjust the bias voltage for all remaining seven EL34 / 6CA7 tubes in the same fashion as biasing EL34 - V5. Using the bias test point and bias adjustment pot next to the corresponding tube socket for measuring and adjusting. You will need to go back and forth a few times until all eight tubes are properly biased.


  9. Once you have finished biasing all eight EL34 / 6CA7 tubes, wait a few minutes and recheck the settings again.


  10. Repeat these procedures to adjust the bias voltage for the EL34 / 6CA7 tubes on the other channel of the amplifier.


  11. The CA-160 mono blocks power amplifier is now ready to use.
 


© Copyright Canary Audio, 2008. All Rights Reserved.