CEC AMP71

Commentary

A controlled power amplifier equipped with LEF developed by Carlos Kandyas.

The AMP71 employs a single-ended circuit in which a single transistor processes all the music signals. Unlike many other amplifiers, the AMP71 does not split the music signal by half a wavelength into the + and - sides. It also eliminates the dynamic range variation that occurs when transistors are arranged for each + - polarity.
In addition, by installing a unique LEF circuit, high-efficiency high-power with less heat generation is realized even though it is pure A class.

Since stable amplification with good linearity is possible by the LEF circuit, basically no NFB loop is required, and a straight and shortest signal path is realized by a completely non-feedback amplifier.

With a unique differential and full balance circuit design, the music signal is processed in a completely separate state from the input terminal to all areas of the volume control and power amplifier, and even to the speaker terminal.
In addition, it has a fully dual-monaural configuration, and with the exception of the AC power inlet, the power supply circuit with a 650 VA toroidal transformer is completely symmetrical from the input terminal to the speaker terminal.

The protection circuit is equipped with a monitoring circuit equipped with a high-speed protector that eliminates mechanical contact, and checks current, voltage, DC, offset, power supply circuit, etc.

The volume control mechanism uses a 100-step thin-film resistor with a high-precision single FET for switching between steps.
As a result, the channel balance is completely uniform on the right and left, and stability without change over time is obtained.

In addition to two balanced and four unbalanced inputs, there is an RCA tape output.
All input signals are switched by a pulse control relay located at the optimum position on the board.

Model Rating

Type	Controlled power amplifier
Rated output	300W + 300W (4 Ω) 200W + 200W (8 Ω)
Input terminal	XLR balance : 2 systems RCA imbalance : 4 lines
Output terminal	Tape output : 1 system Speaker output : 1 system
Signal-to-noise ratio	114dB
Gain	27 dB (unbalanced input)
Total harmonic distortion factor	Not more than 0.018%
External dimensions	Width 435x Height 140x Depth 442 mm
Weight	26kg
Attachment	Remote control