CTA 407 - Integrated Amplifier
Copland has always maintained that the amplifier is the interface between the signal sources and the speaker system; any information that is lost or misinterpreted at this position is lost forever and, conversely, any additional information that is introduced is amplified.
Amplifiers are considered everyday devices and if some are of standard quality and construction, others successfully deviate from the conventional, reminding us of the pursuit of perfection, a human virtue that we like to recognize and approach.
The aesthetics of most Copland amplifiers are one of no-frills luxury. However, with the CTA407 tube amplifier, the simplicity of the design has been compromised with the addition of a fair amount of electronics to support the amplifier's audio stages.
The forty LED diodes on the front panel (10 for each tube), display the bias system and diagnostics of the tubes used in the CTA407. For those who do not want to see them always on, it is possible to deactivate them.
One of the advantages of the CTA407 amplifier is the automatic bias adjustment for any tube, from the 6550/KT88/KT120/KT150 family, used in the power stage. The CTA407's self-bias adjustment system is not only lossless, but is an integrated part of the internal high-pass filtering, which perfectly matches the amplifier's transfer function and significantly improves its overall quality.
The CTA407 features five line inputs, including a tape monitor loop, and an MM phono input, capable of accommodating both high-output moving magnet and moving coil cartridges. It is an evolution of the CTA405 amplifier, which has been coveted by audiophiles worldwide since its launch more than a decade ago.
The push-pull output stages consist of a pair of power tubes per channel, in a fixed ultra-linear configuration, which feature the low distortion of triodes and the generous power of tetrodes. Typically a pair of 6550 or KT family tubes in push-pull configuration can deliver over 100W of power. Moderating the output power, the CTA407 delivers 2x50W in high bias mode in class A/AB. In practice, this means that the amplifier delivers most of its power in class A.
Thanks to the excellent quality of the output transformers used, almost perfect linearity is achieved before using feedback, reducing the internal delay compensation networks and ensuring high stability after the 18 dB negative feedback closing loop.
The CTA407 reproduces music remarkably accurately, without ever hinting at listening fatigue, with strong dynamics and wide flexibility in speaker selection. The low noise from the amplifier itself is a joy, especially for owners of high-efficiency speaker systems.
The CTA407 employs a motorized volume control and can be controlled in its main functions by the Copland RC102A remote control.
Technical specifications
-
Valves used:
6550/KT88: 4pcs
12BH7: 2pcs
ECC83: 1pcs
The auto bias system also automatically adjusts for use with: KT90 / KT100 / KT120 / KT150
- Power: 50W / channel at 4 / 8 ohms
- THD: Less than 0.5% at all levels
- Frequency response: 10Hz 150kHz - 3dB
- Line input sensitivity: 200 mV
- Phono input sensitivity: 2.5mV
- Line input impedance: 50K ohms
- Phono input impedance: 47K ohms
- Signal to Noise Ratio (IHF-A): 100 dB
- Power supply: 230V / 240V +/- 12%
- Consumption: 300 W
- Dimensions (mm.) 435 (W) 215 (H) 420 (D)
- Weight: 20kg
L'amore per la buona musica
Chi siamo
Abbiamo scelto questa attività per passione, e con passione la portiamo avanti. La nostra esperienza, nella riproduzione musicale, nonché in quella della musica dal vivo, ci guida costantemente nelle scelte che facciamo per quanto riguarda i prodotti che andiamo a selezionare per voi.