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About the BC109 AL28
The Blue Circle BC109 AL28 is a custom-built preamplifier utilizing BC109 transistors, known for their low noise and excellent audio characteristics. It incorporates 2800F of capacitance and a custom remote Shallco attenuator, enhancing bass weight, refinement, and articulation. The BC109 transistor itself is an NPN silicon planar epitaxial transistor in a TO-18 metal can package, widely used for switching and amplification in audio circuits due to its low noise figure (~4dB) and good gain characteristics. The BC109 AL28 preamp is praised for its open and airy treble, delicate top end with minimal distortion, organic mids, and superior bass extension and control compared to similar models. This product is favored by audiophiles for its ability to reveal inner details and provide a natural, textured soundstage.
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