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An electronic test apparatus, identified as an "ЭС 4А ОДНОКАСКАДНЫЕ УСИЛИТЕЛИ" (ES 4A Single-Stage Amplifier), is centrally positioned on a wooden shelf within an indoor setting in the city of Sliven, Bulgaria. The device features a light-grey front panel with three top-mounted analog current meters (mA), a central schematic diagram labeled "2" detailing a transistor circuit, and multiple rotary knobs, toggle switches, and banana jack connectors organized into sections like "ВХОД" (Input), "ГЕНЕРАТОР" (Generator), "ВЫХОД" (Output), and "ПИТАНИЕ" (Power). The "ПИТАНИЕ" section includes an analog voltage meter (V) and a "СЕТЬ" (Mains) switch. Two white and blue wires are connected to the "ГЕНЕРАТОР" section on the left side, extending out of frame towards a dark, vertical object partially visible on the far left. The device has a darker blue-grey side casing with ventilation grilles on the right and a black carrying handle on its top surface. On the top surface, to the left, a stack of small red and white rectangular objects and a flat, square metallic object are present. The device rests on a polished wooden shelf, with another wooden shelf visible above it. Below the device, on a lower wooden shelf, a black plastic toolbox with a red handle is visible, alongside a partially coiled white cable on the right. No individuals are present in the scene.
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