Audio Research CA50

Commentary

This is the first all-stage integrated amplifier for audio research.

The amplifier circuit uses a class AB-1 push-pull system with a large beam output tube 6550C.

The signal circuit is fully separated on both sides of the chassis with a dual monaural configuration.
Audio Research's long-standing emphasis on power supply, constant current source and special independent power supply system combine to realize sound quality with less interference.

The input terminals are equipped with a Line 5, and a series of tape terminals are also equipped.
Also included are pre-out terminals for active sub-woofers and additional power amplifiers.

All the function controls on the front panel, except for the power switch, are digitally controlled by a microprocessor. By controlling a relay far away from the control section inside the panel, input selection and precise resistance switching of the master volume can be done to minimize the effect on sound quality.

Uses a gold-plated speaker terminal that supports banana plugs.

Model Rating

Type	Pre-main amplifier
Rated output	45W + 45W (20 Hz to 15 kHz)
Output bandwidth	15 hz to 40 khz -3dB
Total harmonic distortion factor	2% or Less (1 kHz, 45W) 0.05% or Less (0.1W)
Frequency characteristic	2 Hz ~ 50 kHz -3dB (8 Ω output)
Input impedance	100k Ω
Max Input	3.5 Vrms (volume -30dB or less)
Output terminal	4 Ω / 8 Ω
Damping factor	About 13
Signal-to-noise ratio	85 dB (at IHF, input short, rated output)
Vacuum tube used	2 x 6550C matched pair 6922x4
Pwer	100 VAC, 50Hz/60Hz
Power consumption	190W (No Signal) 330W maximum
External dimensions	Width 483x Height 178x Depth 419 mm (Including Handle)
Weight	19.5 kg (Body) 25.5 kg (when packed)