Product Description
The Copland CTA407 is a superbly designed Danish vacuum tube amplifier that delivers a generous amount of power for a valve amp, at exceptionally low noise levels and exhibits excellent speaker control and precision for a great sound we would say falls somewhere in the middle of what a traditional solid state amp sounds like compared to the typical valve sound. This (to us) means it will suit a greater range of speakers and listeners.
With the Copland CTA407 tube amplifier, the forty LED diodes on the front panel (10 for each tube) are the visual part of the tube bias and diagnostic system. And yes, the LEDs can be turned off if you don’t want to read the status of your power tubes on the fly.
The CTA407 will automatically adjust for any tube in the 6550/KT88/KT120/KT150 family. The CTA407 servo system is not only a lossless automatisation of the bias adjustment – it is an integrated part of the CTA407 internal high pass filtering, closely matched to the transfer function of the amplifying circuitry and a vast improvement to the overall fidelity of the amplifier.
It employs five line-level inputs including a tape monitor loop and a built-in RIAA phono circuit accommodating moving magnet, as well as high output moving coil cartridges. The push-pull output stages consist of a pair of matched power tubes in fixed ultra linear configuration, providing the low distortion of triodes and the power of tetrode valves. A pair of 6550 or KT-family tubes in push-pull configuration can deliver more than 100W of audio power. Moderating the power output, the CTA407 delivers 2x50W in high biased class A/AB mode. In practice, this means that the amplifier can deliver most its power in class A state.
Due to the quality of the output transformers, superb linearity is achieved before feedback is employed, reducing the requirements for internal lag compensation networks, and ensuring high stability after the 18dB negative feedback loop is closed.
The CTA407 can provide an extraordinarily accurate reproduction of music without tendency towards listening fatigue, featuring strong dynamics and a wide flexibility in the choice of speakers. The vanishing low perceived noise from the amplifier itself is a bliss, especially for owners of high efficiency speaker systems.
The CTA407 employs motor driven volume control and can be fully controlled by the Copland RC102A remote control.
Specifications:
- Tubes: 6550/KT88: 4pcs. 12BH7: 2pcs. ECC83: 1pcs.
The auto-bias system will adjust also for use with :
KT90 / KT100 / KT120 / KT150
- Rated power: 50W / channel at 4 / 8 ohms with 6550 tubes
- THD: Less than 0.5 % at all levels
- Frequency response: 10 Hz 150 kHz - 3 dB
- Input sensitivity Line: 200 mV for rated power
- Input sensitivity Phono: 2,5 mV for rated power
- Input impedance Line: 50 K ohms
- Input impedance Phono: 47 K ohms
- S/N ratio (IHF-A): 100 dB
- Power consumption: 300 W
- Nominal mains voltage: 115V or 230V / 240V. Factory set for destination country only
- Mains voltage range: +/- 12 %
- Dimensions: 435 x 215 x 420mm (WxHxD)
- Weight 20 kg
