The Dyna-70 Ultimate Upgrade with Automatic Bias (AB or Auto Bias) is the newest version of the Dyna-70 Ultimate Upgrade kit. Now you can enjoy the convenance of not having to check your output tube bias again. Observe the LED’s for the status of your tubes, if the green LED is on, you are ready play music! If an LED isn’t illuminated, it means there is likely a fault with your tube and it needs to be replaced.
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