LED Bias Monitor for Tube Amps
This is a simple bias monitor for vacuum tube power amplifiers that use fixed bias. It indicates visually whether the tube bias current is within some user-determined range. It was originally published in the November 2008 issue of audioXpress.
This item is available as a bare (unpopulated) printed circuit board (PCB) for do-it-yourself enthusiasts. You can download an article reprint, schematic, and parts placement diagram.
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