Stellavox SP 7

The Stellavox SP7 is a highly regarded portable reel-to-reel tape deck produced between 1969 and 1972, known for its precision engineering and professional audio quality.

Technical Overview of Stellavox SP7:

• Type: Portable reel-to-reel tape recorder

• Electronics: Solid state

• Tape Width: ¼ inch (6.35 mm)

• Tape Speeds: 3¾, 7½, 15, and 30 inches per second (ips)

• Tracks: 1 or 2 (mono/stereo)

• Heads: 3 heads, made of permalloy, configured for stereo recording

• Reel Size: Supports up to 7-inch reels (some versions with accessory can handle 10-inch reels)

• Frequency Response: Approximately 20 Hz to 15 kHz at 7½ ips (±1 to 2 dB)

• Wow and Flutter: 0.07% at 15 ips, 0.7% at 7½ ips

• Signal-to-Noise Ratio: About 56 dB for half-track stereo recording at peak level

• Power Supply: Multi-voltage operation, battery portable

• Physical Size: Compact and lightweight, approximately 3" x 8½" x 10½", weighing under 8 lbs

• Build: Machined aluminum case, modular design with easily interchangeable electronic modules and head blocks

• Controls: Speed selector switch, visual indicator for speed variations, and external capacitor connection for non-standard speeds

• Additional Features:
  IEC equalization
  Electronic servo-controlled tape speed for precise operation
  Designed as a professional alternative to Nagra recorders with similar mechanical and electronic quality but smaller size
  No auto-reverse function
  Optional accessories for extended reel sizes and synchronization tracks

Performance and Reputation:

• Rated 9/10 for sound quality and long-term reliability

• Praised for remarkable miniaturization without compromising professional standards

• Used extensively in broadcast, film, and industrial applications due to its portability and high fidelity

This combination of compactness, mechanical precision, and audio performance makes the SP7 a classic professional portable reel-to-reel tape deck from Stellavox’s lineup