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Note: A electronic volt meter (digital preferred) with a millivolt setting is needed to make bias
readings/adjustments. A digital multimeter can be found cheaply at any hardware store. Here's
the cheapest we've found on the web, which is totally sufficient for the job:
ote: The 4 output tubes work in pairs; the left bias control adjust the bias voltage for V1 and V2,
while the right control adjusts the bias voltage for V3 and V4. While the output tubes can only be
adjusted in pairs, a test jack is provided for each individual tube to provide more accurate bias
monitoring (e.g. trying to find a faulty tube).
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