Accuphase C-290V Control Amplifier

Based on the balanced transmission technology established in the C-290, it uses a current feedback amplification circuit. The printed circuit board is made of Teflon material. It has a four-gang volume control with high-quality CP elements, independent amorphous power transformers for the left and right, and a fully mono construction with a unit amplifier configuration.

Frequency response

Balanced, Unbalanced: 3Hz to 300kHz +0 -3.0dB

20Hz to 20kHz +0 -0.2dB

AD MM/36dB, MC input: 20Hz to 20kHz ±0.2dB

AD MM/30dB input: 20Hz to 20kHz ±0.3dB

Total harmonic distortion 0.005%

Input sensitivity/impedance

(rated output/0.5V output) AD MM/30dB: 8.0mV/2.0mV/47kΩ

AD MM/36dB: 4.0mV/1.0mV/47kΩ

AD MC/62dB: 0.2mV/0.05mV/10Ω, 30Ω, 100Ω switchable

AD MC/68dB: 0.1mV/0.025mV/10Ω, 30Ω, 100Ω switchable

Balanced: 252mV/63mV/40kΩ

Unbalanced: 252mV/63mV/20kΩ

Rated output/impedance Balanced, Unbalanced output: 2V/50Ω

Tape rec (at AD input): 252mV/200Ω

S/N, input equivalent noise

Input short, A-weighted EIA S/N

Rated output S/N input equivalent noise

AD MM/30dB: 94dB -136dBV 86dB

AD MM/36dB: 90dB -138dBV 86dB

AD MC/62dB: 80dB -154dBV 85dB

AD MC/68dB: 75dB -155dBV 85dB

Balanced: 111dB -123dBV 95dB

Unbalanced 111dB -123dBV 95dB

Maximum output level

(Distortion 0.005%, 20Hz to 20kHz) Balanced, Unbalanced output:8.0V

Tape rec:9.5V

Maximum AD input voltage

(1kHz, Distortion 0.005%) MM(30dB/36dB) input:300mV/150mV

MC(62dB/68dB) input:7.5mV/3.75mV

Minimum load impedance Balanced, Unbalanced output:600Ω

Tape rec:10kΩ

Gain Balanced, Unbalanced input → Balanced, Unbalanced output:18dB

Unbalanced input → Rec output:0dB

AD MM(30/36dB) input → Balanced, Unbalanced output: 48/54dB

AD MM (30/36dB) input → Rec output: 30/36dB

AD MC (62/68dB) input → Balanced, Unbalanced output: 80/86dB

AD MC (62/68dB) input → Rec output: 62/68dB

Compensator

(Volume -30dB) 1: +3dB (100Hz)

2: +8dB (100Hz), +6dB (20kHz)

Subsonic filter 10Hz, -18dB/oct

Attenuator -20dB

Power supply AC100V, 50Hz/60Hz

Power consumption 24W

Maximum external dimensions Width 469 x Height 160 x Depth 405mm

Weight 23.8kg