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Control of the alternating current of the filament in the power amplifier. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Tube Power Amplifiers

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The circuit was used in debugging Mammoth.

AC Filament Control in a Power Amplifier
(click to enlarge)

Glow filaments (4 in total, two channels shown) are monitored for breakage. The current transformer TR1 is wound in a B30 cup with a two-section frame. Primary winding - 3 turns of filament wire, secondary - PEV 0.3 before filling in bulk. In this case, an alternating current of 3A creates a constant voltage of 1.5V at the outputs of the detectors. Resistor R1 must be reduced to 20kΩ (suppress RF resonances).

Publication: klausmobile.narod.ru

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