DRAFT Tentlabs Application Note AN.05 â Negative Bias Supply

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Indicators The following LEDs indicators are present on the board: Both power on LEDs immediately light up after switch on The operate LED comes on after some 45s after power up, when the units starts to regulate the tube current.
Switch the amplifier off. Double check whether you haven’t mixed up cathodes and grids by following each pair of wires from tube socket to module. The bias module is factory adjusted so that the output tube bias currents become 40mA. This value can be changed according user requirements, by tuning trimmer R14: To decrease the bias current: To increase the bias current: Turn the trimmer counterclockwise Turn the trimmer clockwise At testpoint J3, an indication of the cathode current can be measured; this is explained at the next page.
Page 1 and 2: DRAFT Tentlabs Application Note AN.
Page 3 and 4: Technology The module contains an i
Page 5 and 6: Module placement Carefully cut the
Page 7 and 8: Input wiring - Ground The bias modu
Page 9: Testing time Remove all output tube
Page 14: FAQ Specifications Electrical Mecha

DRAFT Tentlabs Application Note AN.05 â Negative Bias Supply

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DRAFT Tentlabs Application Note AN.05 â Negative Bias Supply