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Disclaimer of Liability
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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.
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Tools Required |
Digital multimeter
Long-handled slotted screwdriver
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Procedures |
To check and adjust the bias voltage of the 300B tubes, simply follow the following
procedures:
- Making sure that the power switch is in the OFF position.
- Install all the tubes to the corresponding sockets using a gentle rocking
motion.
- Connect your speaker leads, input cable and power cord to each amplifier.
- Turn ON the amplifier.
- 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.
- Insert the positive test lead into the bias test point marked as "300B - 1".
- Carefully insert a long-handled slotted screwdriver into the bias adjustment pot
marked as "300B - 1". Slowly rotate the screwdriver to adjust the bias voltage until
it reaches 0.55V.
- Repeat steps 6 and 7 to adjust the bias voltage for the other 300B tube using
bias test point marked as "300B - 2" and bias adjustment pot marked as "300B - 2".
You will need to go back and forth a few times until both of the 300B tubes are
properly biased.
- Once you have finished biasing the two 300B tubes, wait a few minutes and
recheck the settings again.
- Repeat these procedures to adjust the bias voltage for the 300B tubes on the
other channel of the amplifier.
- The CA-303 Signature Edition mono blocks power amplifier is now ready to use.
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