Tube Complement and Bias Setting
A set of three matched Groove Tubes 12AX7 preamp tubes and two matched Groove Tubes EL84 power tubes, graded according to Fender's specifications, are used in all factory Blues Juniors. The Blues Junior uses a "fixed" fixed-power tube bias (no way to vary the bias point), but it's pretty "hot" and can accommodate most matched pairs you can buy. Most pairs wont last though -they run hot- so a common mod is to add a bias trim to be able to adjust the idle current when switching tubes.
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