Moniblock Amplifier Series 7R
Croft Acoustics Ltd.; Birmingham
- Pays
- Royaume Uni
- Fabricant / Marque
- Croft Acoustics Ltd.; Birmingham
- Année
- 2016 ?
- Catégorie
- Amplificateur BF ou mélangeur BF
- Radiomuseum.org ID
- 362009
- No. de tubes
- 3
- No. de transistors
- 2
- Principe général
- Amplification audio; Hi-Fi-High End products
- Gammes d'ondes
- - sans
- Tension / type courant
- Alimentation Courant Alternatif (CA) / 115 / 230 Volt
- Haut-parleur
- - Ce modèle nécessite des HP externes
- Puissance de sortie
- 100 W (sans distorsion)
- Matière
- Boitier métallique
- De Radiomuseum.org
- Modèle: Moniblock Amplifier Series 7R - Croft Acoustics Ltd.;
- Forme
- Modèle de table profil bas (grand modèle).
- Remarques
-
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.
- Littérature
- -- Original prospect or advert
- Auteur
- Modèle crée par Gary Cowans. Voir les propositions de modification pour les contributeurs supplémentaires.
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Tous les appareils de Croft Acoustics Ltd.; Birmingham