Cary Audio Design CAD 120S Stereo Vacuum Tube Power Amplifier (Black)

This innovative stereo power amplifier is rated at 60 watts per channel in triode mode and 120 watts per channel in ultra linear mode into an 8 ohm speaker load.  

Full rated output power is from 17 Hz to 23 kHz with less than 1% total harmonic distortion.  The output stage may be switched 'on the fly' from triode mode to ultra linear mode by using a front panel selector button.  There are LED lights above the mode selection button to show which mode the power amplifier is working in for visual confirmation.  Another nice feature is that the amplifier has an operating mode memory.  The CAD 120S will remember either the triode or ultra-linear mode selection when the amplifier is turned to the off position. 

The vacuum tubes in each channel consist of one (1) 6SN7 for the input gain, one (1) 6SN7 for the driver stage and four (4) KT 88 output power tubes.  The circuit is a balanced design with separate RCA and XLR inputs.  A soft start turn on circuit is built-in for long life and easy turn on in large systems.  The power supply features 1,120 micro farads of capacitance for ample reserves in demanding usages.  The output transformers and the power transformer have a single cover painted to match the chassis.  

The backlit front panel meters indicate the bias setting for each channel and visually indicate proper operation for the CAD 120S amplifier.