• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Bias adjustment on Dynaco ST70

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You have two connectors in the front? Each have a hole that is marked "Biaset 1,56 V". Set your multimeter on 2 V. Put the read pin from the multimeter in the hole mentioned and the black pin on the chassis. Take the left side first. Use a screwdriver on the potmeter on the top of the chassis between the valves. Adjust the left potmeter til you read 1,56 V on the mulitmeter. Then move the red pin to the right connector/hole, and repeat the above. I a adjust to only 1,4 V (longer life on the valves, and the amplifier plays better, in mye opinion).

You can phone me, I am a norwegian +47 916 26 170;)

best wishes
jan ove
 
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