Moniblock Amplifier Series 7R

Croft Acoustics Ltd.; Birmingham

Daten
Forum
Bilder
Sammlungen

  • Jahr
  • 2016 ?
  • Kategorie
  • NF-(Niederfrequenz-) Verstärker oder -Mixer
  • Radiomuseum.org ID
  • 362009

 Technische Daten

  • Anzahl Röhren
  • 3
  • Anzahl Transistoren
  • 2
  • Hauptprinzip
  • NF-Verstärkung; Hi-Fi-High End Produkte
  • Wellenbereiche
  • - ohne
  • Betriebsart / Volt
  • Wechselstromspeisung / 115 / 230 Volt
  • Lautsprecher
  • - Dieses Modell benötigt externe(n) Lautsprecher.
  • Belastbarkeit / Leistung
  • 100 W (sinus/unverzerrt)
  • Material
  • Metallausführung
  • von Radiomuseum.org
  • Modell: Moniblock Amplifier Series 7R - Croft Acoustics Ltd.;
  • Form
  • Tischgerät-gross, - Querformat (breiter als hoch oder quadratisch).
  • Bemerkung

  • Croft Acoustics Series 7R (Monoblock/Regulated Version)

    • Type: Monoblock (single-channel) hybrid power amplifier, regulated version.
    • Input Stage:
      • Typically uses ECC83 (12AX7) tube, sometimes with additional tubes for regulation (e.g., Tesla 0G3, ECC99).
    • Output Stage:
      • High-quality MOSFETs, as in the Series.
    • Topology:
      • Hybrid: tube input, MOSFET output.
      • Monoblock configuration: each unit drives one channel, with an independent power supply.
    • Power Output:
      • 50–55 watts RMS into 8 ohms per monoblock; higher output into lower impedances.
    • Power Supply:
      • Features a regulated high-tension (HT) supply for the tube stage.
      • Larger 300VA toroidal transformer for increased current capability and stability.
      • Additional regulation tubes (e.g., 0G3) may be present for voltage regulation.
    • Construction:
      • Hand-wired, point-to-point, no PCBs.
      • Metal chassis for shielding and durability.
    • Sound/Performance:
      • Improved channel separation, control, and dynamic headroom due to monoblock design and regulated supply.
      • Greater refinement, grip, and stability across the frequency range relative to the standard Series.
    • Physical Characteristics:
      • Each amplifier is dedicated to a single channel, requiring a pair for stereo use.

    Technical Comparison Table

    Feature Series 7 (Stereo) Series 7R (Monoblock/Regulated)
    Channels 2 (stereo) 1 per unit (monoblock)
    Input Stage ECC83 (12AX7) ECC83 (12AX7) (+ regulation)
    Output Stage MOSFET MOSFET
    Power Output 45–50W per channel (8Ω) 50–55W per unit (8Ω)
    Power Supply Standard Regulated HT, larger transformer
    Construction Hand-wired, no PCBs Hand-wired, no PCBs
    Chassis Shared with other Croft models Metal, monoblock configuration
    Sound/Performance Musical, detailed, best with 90dB+ speakers Improved control, separation, and refinement

    Summary:
    The Series 7 is a minimalist stereo hybrid amplifier with a tube input and MOSFET output, designed for high musicality and value. The Series 7R is a monoblock, regulated version with a larger power supply and additional voltage regulation, offering enhanced channel separation, control, and sonic refinement.

  • Literaturnachweis
  • -- Original prospect or advert
  • Autor
  • Modellseite von Gary Cowans angelegt. Siehe bei "Änderungsvorschlag" für weitere Mitarbeit.

 Sammlungen | Museen | Literatur

 Forum