COPLAND CTA407

50+50W RMS integrated tube amplifier.

Preamplifier stage with valves (type 2x12BH7 and 1xECC83), final stage with valves (type 4x6550/KT88) operating in class A/AB. 40 front LEDs indicating bias and diagnostics of the 4 power tubes. Autobias. Super-selected components, linear output transformer from 5Hz to 100KHz. 5 line, tape loop and phono MM inputs. Remote control supplied.

Other features

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 in this position is lost forever and, conversely, any additional information that is introduced is amplified.

Amplifiers are considered everyday appliances and while some are of standard quality and construction, others successfully deviate from the conventional, they remind us of the pursuit of perfection, a human virtue we like to recognize and approach. The aesthetics of most Copland amplifiers are characterized by no-nonsense luxury.

However, with the CTA407 tube amplifier the design simplicity has been compromised with the addition of a fair amount of electronics to support the audio stages of the amplifier. 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 adjustment for any valve, of the 6550/KT88/KT120/KT150 family, used in the final stage.

The self-bias adjustment system of the CTA407 is not only lossless, but is an integrated part of the internal high-pass filtering, which perfectly matches the transfer function of the amplifier and greatly improves its overall quality.

Copland CTA407 features five line inputs, including a tape monitor loop, and an MM phono input, capable of accommodating high output moving coil and moving coil cartridges.

It is an evolution of the Copland CTA405 amplifier, the object of desire of audiophiles around the world 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 the triodes and the generous power of the tetrodes.

Normally a pair of 6550 or KT family valves in push-pull configuration can deliver a power of over 100W. Moderating the power output, the CTA407 delivers 2x50W in class A/AB high bias mode. 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, an almost perfect linearity is obtained before the use of the feedback, reducing the internal delay compensation networks and ensuring a high stability after the negative feedback closing loop at 18dB.

CTA407 reproduces music extraordinarily accurately, without ever mentioning listening fatigue, with strong dynamics and a wide flexibility in the choice of speakers. The low noise from the amplifier itself is a joy, especially for owners of highly efficient speaker systems.

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

Technical characteristics

Tubes used: 6550/KT88: 4pcs 12BH7: 2pcs ECC83: 1pcs

The auto bias system adjusts automatically also for the use of: 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: 2.5 mV

Line input impedance: 50K ohms

Input impedance

Phono: 47K ohms

Signal to Noise Ratio (IHF-A): 100dB

Power supply: 230V / 240V +/- 12%

Consumption: 300W

Dimensions (WxHxD): 435x215x420mm

Weight: 20kg