AKG 414EB Serial # 7829.
The 414EB was the second-generation C414 microphone from AKG. Like its predecessor, it combined AKG’s famous CK-12 capsule with a solid-state amplifier circuit.
AKG C414EB SchematicThe EB revision introduced a 3-way high-pass filter, and upgraded the -10dB pad to include a -20dB option; both were selectable via switches on the rear of the mic body, below the microphone capsule.
The left-side switch controls the pad: 0dB, -10dB, -20dB.
The right switch controls the HPF: flat, -12dB/octave @ 75Hz, -12dB/octave @ 150Hz.
As with the original C414, the EB provided 4 polar patterns — Cardioid, Omni, Figure-of-8, and Hypercardioid — selectable via a switch below the capsule on the front of the microphone body.
The first production runs of the C414EB used AKG’s original CK-12 capsule, now known as the “brass” CK-12. This vintage microphone has the highly sought after "brass" CK-12 capsule.