Biasing of the Power Tubes

Bias voltage applied to the grids of the power tubes in the output stage should be checked from time to time (once a month) to keep these tubes operating at the optimum operating point. A properly biased power tube will have a longer, happier life.

To check the bias of the 6550C/KT88 tubes, place the amplifier in mute with the power on and the amplifier in operate mode (STANDBY LED Green; Power LED Red-for MUTE). Looking at the tube top, take note of the power tube location and the bias LED below the surface of the chassis next to each tube. Also note the printed line that leads to each power tube. At the opposite end of this line is the bias adjustment for each power tube, a small slotted metal shaft, again located below the chassis surface. See reference dia- grams for further clarification.

If a bias LED is glowing red the tube is overbiased; if a bias LED is glowing green the tube is underbiased, both conditions cause undue wear and/or are not optimal for the tube. The LED should not be glowing at all for the proper operating bias.

To properly bias the tubes is a simple procedure. For the power tubes on the left (LV5 to LV8) insert the biasing driver into the slot head of the bias adjustment control and turn the driver to adjust the control counterclockwise so the LED is green. Turn the adjustment back clockwise until the LED begins to dim. At this point; through careful adjustment, continue slowly turning the bias control, stopping the moment the LED goes out. No light from the LED indicates a properly biased tube. For the most accurate biasing, the biasing controls should always be rotated from the LED emitting gre e n to the LED emitting no light, stopping immediately, as soon as the LED emits no light. Repeat procedure on the next tube until all tubes are properly biased.

For tubes on the right side of the amplifier (V5 to V8) the biasing controls are opposite. Turn the biasing controls clockwise initially to decrease bias so the LED is green and counterclockwise until the LED goes out. Refer to the Tube Top diagram for direction.

A cutaway of the tube top showing the location of the biasing controls below the tube top surface and the biasing driver.

7

Page 8 Page 10
Page 9
Image 9
Sonic Impact Technologies Power 2 manual Biasing of the Power Tubes
Page 8 Page 10

Power 2 specifications

Sonic Impact Technologies Power 2 is an innovative audio solution designed for a wide range of applications, from personal entertainment to professional sound reinforcement. This advanced product combines cutting-edge technologies with user-friendly features, delivering exceptional sound quality that meets the demands of modern audio environments.

One of the standout characteristics of the Power 2 is its compact, lightweight design, which allows for easy portability and installation. Weighing in at a mere few pounds, it can effortlessly be transported to various locations, making it an ideal choice for musicians, DJs, and presenters on the move. Its sleek exterior not only looks modern but is also engineered for durability, ensuring it can withstand the rigors of frequent use.

At the heart of the Power 2's performance is its advanced Class-D amplification technology. This efficient amplifier delivers a powerful output while maintaining low power consumption. The result is a crystal-clear audio experience with low distortion, even at higher volume levels. Users can expect rich bass tones combined with clear highs, providing an immersive listening experience.

The Power 2 also features integrated Bluetooth connectivity, allowing users to stream music wirelessly from smartphones, tablets, or laptops. This is a significant advantage for those who prefer to forgo traditional wired connections, offering flexibility and convenience for today's digital age. Additionally, it supports a range of audio formats, ensuring compatibility with various devices and platforms.

Another remarkable aspect of the Sonic Impact Technologies Power 2 is its user-friendly interface, equipped with intuitive controls for volume, bass, and treble adjustments. This allows users to customize their audio experience to their unique preferences, ensuring optimal sound quality in any environment. Furthermore, the unit includes multiple input options, such as USB and AUX, enabling seamless integration with various audio sources.

Power 2's robust battery life is another noteworthy feature. Ideal for outdoor events or locations with limited power access, the device can operate for extended periods without requiring a recharge. This makes it an excellent choice for festivals, parties, or any gathering where power availability is uncertain.

Overall, Sonic Impact Technologies Power 2 is a versatile audio solution that stands out in its category. Its combination of portability, advanced amplification technology, Bluetooth connectivity, and extended battery life makes it a top-tier choice for audio enthusiasts and professionals alike. Whether you're looking to enhance your listening experience or need reliable sound output for an event, the Power 2 offers a complete package of features designed to meet the diverse needs of users.
Top Page Image Contents