Monoblock MA15 Mk 1

Radford Electronics Ltd.; Bristol

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  • Année
  • 1960 ?
  • Catégorie
  • Amplificateur BF ou mélangeur BF
  • Radiomuseum.org ID
  • 360483

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 Spécifications techniques

  • No. de tubes
  • 5
  • Principe général
  • Amplification audio
  • Gammes d'ondes
  • - sans
  • Tension / type courant
  • Alimentation Courant Alternatif (CA) / 50 Hz, 200/240 Volt
  • Haut-parleur
  • - Ce modèle nécessite des HP externes
  • Puissance de sortie
  • 15 W (sans distorsion)
  • Matière
  • Boitier métallique, lampes visibles
  • De Radiomuseum.org
  • Modèle: Monoblock MA15 Mk 1 - Radford Electronics Ltd.;
  • Forme
  • Modèle de table boitier avec vouvercle
  • Dimensions (LHP)
  • 8.5 x 6.25 x 17 inch / 216 x 159 x 432 mm
  • Remarques

  • The Radford MA15 series of amplifiers was a well-regarded line of vacuum tube audio amplifiers produced in the 1960s.

    There were four versions:

    1. MA15 Mk1: This was the original version of the amplifier.
    2. MA15 Mk2 Early: An updated version of the original design.
    3. MA15 Mk2 Late: A further refinement of the Mk2 design.
    4. CMA15: This was a kit version of the MA15 amplifier.

    The original Radford MA15 Mk1 was a monoblock valve power amplifier with the following characteristics:

    • Output power: 15 watts
    • Circuit design: Based on a variant of the classic Philips/Mullard '5-20' circuit
    • Output stage: Push-pull EL34 pentodes in ultra-linear configuration
    • Phase inverter: Triode-triode configuration
    • Feedback: Lower amount compared to Mk2
    • Output transformer: Less advanced than Mk2, with first resonance around 60-70kHz
    • Performance: Higher distortion levels, especially at frequency extremes
    • Power delivery: Limited ability to deliver full power at high frequencies

    Radford MA15 Mk1 Output Transformer

    • Resonance Frequency: The Mk1 output transformer had a first resonance around 60-70kHz.
    • Performance: This design resulted in higher phase shifts and distortion at high frequencies, limiting its ability to deliver full power at the upper end of the audible spectrum.
    • Design Complexity: The transformer was less advanced, which contributed to reduced stability and slightly inferior sound quality compared to the Mk2.
  • Prix de mise sur le marché
  • 23.00 GNS
  • Auteur
  • Modèle crée par Gary Cowans. Voir les propositions de modification pour les contributeurs supplémentaires.

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