Used. Studio only. Serial #33547 (1990)

The AKG C 414 B-ULS is a legendary, transformer-balanced, large-diaphragm condenser microphone. Introduced in 1986, it remains a highly sought-after studio workhorse renowned for its incredibly flat "Ultra-Linear" response and warm, natural character. [1, 2, 3, 4]Core Features

• Capsule: Gold-sputtered 1-inch dual-diaphragm (the signature Austrian brass housing characteristic).
• Polar Patterns: 4 switchable patterns (Omnidirectional, Cardioid, Hypercardioid, Figure-8).
• Filters & Pads: Three-position bass cut (Flat, 75 Hz, 150 Hz) and three-position attenuation pad (0, -10, -20 dB).
• Transformer: The last classic 414 series to feature an output transformer, which gives it a smoother high end and more low-end weight than modern transformerless iterations. [1, 2, 3, 4]

Usage & Valuation

• Best For: Acoustic instruments, overheads, grand pianos, and as an all-around studio utility microphone.
• Market Value: Depending on condition and accessories (shockmount, case, paperwork), these vintage units generally sell used for between $800 and $1,200 USD. [1, 2, 3, 4, 5]

A Note on the Serial NumberThe specific number you mentioned (#33547) identifies an original Austrian-built unit. If you are looking to buy or sell one with this serial number, it helps to check for signs of capsule wear, bubbling under the finish (a known cosmetic issue with some early batches), or capsule crackle, which requires technician service.