Huldra 10

The Tandberg Huldra 10 is a vintage AM/FM stereo receiver, renowned for its high-quality audio performance and robust design. Produced by the Norwegian company Tandberg in the 1970s, it’s a legendary model among audiophiles and DX radio hobbyists, known for its full-coverage HF receiver and powerful hi-fi sound.

Key Features

• Receiver Type: AM/FM stereo receiver with six wavebands, including three shortwave bands covering the international shortwave spectrum, longwave, and mediumwave.
• Amplifier:
  • Power Output: 28 W per channel (sine wave, 1 kHz, 8 Ω); 38 W per channel (4 Ω). Both channels driven simultaneously deliver 25 W per channel from 20 to 20,000 Hz in 8 Ω.
  • Distortion: Low distortion at 0.3% (DIN 45500), with 0.1% (8 Ω) and 0.15% (4 Ω) at 1 dB below nominal output at 1 kHz.
  • Design: Fully complementary output stage for minimal crossover distortion and an electronic protection circuit to prevent damage from short-circuited speakers.
• FM Tuner:
  • Utilizes field-effect transistors (MOSFETs) and integrated circuits for excellent sensitivity and protection against interference from nearby stations.
  • Features ceramic filters for good selectivity and low distortion.
  • Stereo decoder with phase-locked-loop oscillator for high channel separation and low distortion in stereo transmissions.
• AM Receiver:
  • Six tuned circuits in the intermediate frequency amplifier for enhanced selectivity.
  • Built-in antenna for longwave and mediumwave, with high sensitivity to capture weak stations and a filter to reduce interference from adjacent stations.
• Pre-Amplifier:
  • Supports magnetic (RIAA-corrected) and ceramic phono pick-ups, with a switch for adjustment.
  • Phono input sensitivity: 2.4 mV (magnetic) or 72 mV (ceramic).
  • Signal-to-noise ratio: High, measured at 2x50W in 8 Ω (DIN 45 500).
• Filters: Includes high and low filters to reduce noise (hiss or rumble) from program sources.
• Connections:
  • Inputs for record player (magnetic or ceramic pick-up), tape recorder, and an additional program source.
  • Front output for stereo headphones.
• Build Quality: Described as “built like a tank,” with a durable chassis and high-quality wood panels (often oak or teak). Its aesthetic is noted for blending well with modern interiors.
• Special Features:
  • Advanced refinements like field-effect transistors in the AM receiver and a robust power amplifier design.
  • Known for its ability to handle both weak and strong signals effectively, making it a favorite among DX radio enthusiasts.