Operation, Speaker Binding Posts | Cary Audio Design CAD 120S

OPERATION

Your new CAD 120S power amplifier is ready for operation after the speaker, interconnect cables and the vacuum tubes have been installed into their proper sockets. Refer to the labeling on the chassis for placement and proper tube installation.

SPEAKER BINDING POSTS

The CAD 120S will drive loudspeaker loads from as low as 2 ohms to a high of 16 ohms without any adjustment. Please remember to keep the proper phase on each channel when connecting the loudspeaker cables. Red is positive and black is the negative lead.

TRIODE OR ULTRA-LINEAR MODE SWITCHES

The push button located on the lower right side of the front panel will toggle from triode to ultra- linear modes. There is a blue LED indicator lamp located above the switch. When this blue LED is illuminated the CAD 120S is in the triode mode. Push the button again and the red LED will appear. The CAD 120S is now in the ultra-linear mode. This mode selector system has a memory feature. The amplifier can be powered down (turned off) and the amplifier operating mode will remain in the last position. The absolute default mode is triode if the amplifier is unplugged from the AC wall outlet.

POWER ON / OFF SWITCH

The front panel push button located to the lower left is a power on power off selector. With the CAD 120S plugged into the wall AC outlet this button will engage the soft-start system and bring the amplifier to the full operate mode. You will notice that the two DC current meters on the front panel will light up blue. The vacuum tubes will light as well. To power down (turn off) simply push the power button once again and the soft start system will remove the main AC power from the power supply in the CAD 120S.

BIAS MEASUREMENT

Setting the operating bias levels on the CAD 120S is a rather simple matter thanks to the built in front panel DC current meters. These two meters indicate the DC current being drawn by each channel. The meter to the left reflects the operating current for the left channel. The corresponding meter to the right indicates the operating bias level of the right channel. From the factory the bias has been set to approximately 140 ma. DC current on each channel. This read out will vary with different AC wall voltages.

On the rear panel of the CAD 120S is a bias adjustment potentiometer for each channel. This is a screwdriver slotted shaft control. After the amplifier has been powered up for a few minutes observe the meter readings. The proper reading should be 140 ma. plus or minus 10 ma. To make the bias adjustment insert a flat bladed screwdriver into the rear mounted bias adjustment potentiometer and turn clockwise to raise the bias or counter clockwise to lower the bias reading. There is some interaction between channels. Adjust the right and left channel bias a few times until you have an equal reading (plus or minus a few ma) on each channel. The bias reading level is not critical in respect to a range of a low reading of 125 ma. to a high reading of 170 ma. The preferred reading should be approximately 140 ma. plus or minus 10 ma. The DC bias current value will fluctuate with varying in house AC wall voltage. As air conditioning systems

CAD 120S specifications

Cary Audio Design has long been synonymous with high-fidelity audio equipment, and their CAD 120S amplifier exemplifies this commitment to quality and innovation. The CAD 120S is a stunning piece that bridges the gap between the classic analog warmth of tube amplification and the precision of modern technology.

At the heart of the CAD 120S lies a premium dual-triode design using 6550 power tubes, offering an impressive output of 120 watts per channel. This robust power allows the amplifier to drive a wide range of loudspeakers with ease, delivering a dynamic listening experience. The amplifier features a push-pull circuitry configuration, which enhances linearity and minimizes distortion, ensuring that both subtle nuances and loud crescendos are reproduced faithfully.

One of the standout features of the CAD 120S is its sophisticated power supply. Designed with separate power transformers for each channel, it maintains low noise levels and provides exceptional headroom. This approach not only enhances sonic clarity but also contributes to the longevity of the components, a hallmark of Cary's design philosophy.

Additionally, the CAD 120S boasts a fully-balanced input stage, which is essential for preserving the integrity of the audio signal over longer cable runs. The use of high-quality components throughout the signal path ensures that the amplifier delivers a warm, rich sound, devoid of harshness. Cary Audio Design's commitment to craftsmanship is evident in the CAD 120S's construction, featuring a sturdy chassis and a meticulously finished front panel that is as visually appealing as it is functional.

For audiophiles, the CAD 120S is not just an amplifier; it is a gateway to a lifelike musical experience. Its ability to handle a wide frequency range contributes to a soundstage that is expansive and immersive. The depth and detail provided by this amplifier allow listeners to engage with their favorite records in a way that is both fulfilling and exciting.

In conclusion, the Cary Audio Design CAD 120S is a remarkable amplifier that fuses traditional tube warmth with cutting-edge engineering. Its powerful output, balanced design, and high-quality components make it a standout choice for any serious music lover looking to elevate their audio system. With its timeless design and exceptional performance, the CAD 120S continues to build on Cary's legacy of audio excellence.