Copland COURT 407

Copland has always supported that the amplifier is the interface between signal sources and the speaker system; any information that is lost or badly interpreted in this position is lost forever and, vice versa, any additional information is introduced, is amplified. Amplifiers are considered everyday appliances and if some are of standard quality and realization, others are successfully disconnected from conventional, we remember the search for perfection, a human virtue that we like to recognize and approach.

The aesthetics of most amplifiers Copland is characterized by a luxury without frills. However, with the CTA407 valve amplifier, design simplicity has been compromised by adding a fair amount of electronics to support the audio stages of the amplifier.

The forty LED diodes on the front panel (10 for each valve), display the valve bias and diagnostic system used in the CTA407. For those who do not want to see them always turned on, you can turn them off.

One of the advantages of the CTA407 amplifier is the automatic adjustment for any valve, the 6550/KT88/KT120/KT150 family, to be used in the final stage. The CTA407 self-regulating system is not only leak-free, but is an integrated part of the internal high-pass filtering, which perfectly adapts to the amplifier transfer function and greatly improves its overall quality.

Copland CTA407 has five line inputs, including a loop tape monitor, and a MM phono input, which can accommodate mobile magnet heads and high output mobile coil. This is an evolution of the amplifier Copland CTA, object of the desire of audiophiles from all over the world since its launch, which took place more than ten years ago.

Push-pull output stages consist of a pair of power valves per channel, in ultra-line fixed configuration, which present low triode distortion and generous tetrode power. Normally a pair of 6550 valves or the KT family in push-pull configuration can deliver a power of over 100W. Moderating output power, CTA407 delivers 2x50W in high bias mode in class A/AB. Basically, this means that the amplifier delivers most of its power in class A.

Thanks to the excellent quality of the output transformers used, an almost perfect linearity is achieved prior to the use of the reverse, reducing the internal networks of compensation of the delay and ensuring high stability after the closing ring of the negative retroaction to 18 dB.

CTA407 reproduces music in an extraordinary way, without ever mentioning listening fatigue, with a strong dynamic and a wide flexibility in the choice of speakers. The low noise from the amplifier itself is a joy, especially for the owners of high efficiency loudspeakers systems.

CTA407 uses motorized volume control and can be controlled in its main functions by the remote control Copland RC102A.

Technical characteristics

• Valves used:
  6550/KT88: 4pcs
  12BH7: 2pcs
  ECC83: 1pcs
  
  
  
• The auto bias system is automatically adjusted for the use of:
  KT90 / KT100 / KT120 / KT150
  
• Power: 50W / 4 / 8 ohms channel
• THD: Less than 0.5 % at all levels
• Frequency response: 10 Hz 150 kHz - 3 dB
• Line input sensitivity: 200 mV
• Phono input sensitivity: 2.5 mV
• Line input impedance: 50 K ohms
• Phono input impedance: 47 K ohms
• Signal/noise ratio (IHF-A): 100 dB
• Power supply: 230V / 240V +/- 12 %
• Consumption: 300 W
• Dimensions (LxAxP): 435x215x420mm
• Weight: 20kg