Troubleshooting:

It is rare that any of these problems occur but if they do here is some things to try.

HUM - Try a mains ground adapter if they are legal in your country. They are also called 3 pin to 2 pin adapters or "cheaters" and are available in hardware stores. There should be one ground in your system and only one. If two or more pieces of gear have 3 pin AC cables a ground loop can occur which will usually cause hum. The Stingray is probably the best grounded single piece as it is the center of your system.

HISS - Usually one of the sources. This source may have a volume control that is turned down and forcing you to turn up the volume of the Stingray. Adjust the source so that it is a similar volume as your other sources. If it seems to be the one channel of the Stingray, then it is probably an input tube (12AT7WA). Most tubes should last many years but sometimes they get noisy prematurely. To verify, you can swap the two 12AT7s (with the power off) then test again. Be careful - tubes can be hot, don't bend any pins and gently wiggle the tube to remove it or insert it. Force should not be needed.

BALANCE - The two speakers sound different - It may be the CD or source and the way it was recorded. First try a different source. Next try swapping the inputs. Power down and swap left and right inputs. If it is the source, then the problem will "follow" the swap. Return them to normal (L=L). Power down again and next try swapping the speaker connections by putting the left speaker wire in the right terminals and right wires into the left terminals. If the problem switched sides then the Stingray is suspect, if the problem stayed on the same side it is probably a damaged or fatigued speaker.

ONE CHANNEL DEAD - Usually just a bad connection or an interconnect is plugged in wrong. Check your wiring. You can try any of the other 4 inputs and verify that both channels work on other inputs or not. The Balance Control is centered ? You might try swapping the speaker interconnects at the Stingray end. If the problem swaps sides then it may be the Stingray. The two most likely problems is a bad tube (12AT7 or 6414) or a blown 250 mA (MDL 1/4) B+ fuse located in the Stingray. Wait at least 20 minutes after turning off the amp and unplugging the power. There is about 400 volts on these fuses when power is on and it takes a while before the power supply capacitors discharge so there could still be volts there even when unplugged - so be patient and let the power supply discharge before taking off the bottom cover and poking around. There is a SHOCK HAZARD unless you follow these directions. The current is low and it is DC which means we are not talking "lethal" but it can hurt, arc and burn, not to mention make one jump and yell nasty four letter words. Also, use one hand - not two. Wearing a cotton glove insures that there won't be any surprises.

TUBE GLOWS CHERRY RED. This is where you can see the plate area of the tube glowing red hot (they are normally gray or black and are the most visible part inside the tube).This indicates a bias problem or a bad tube; immediately attempt to re-bias the tube in question (see page 15). If the bias cannot be adjusted on that tube, immediatley turn off the power; the tube will have to be replaced. It is normal to see a slight blue glow that seems to coat the inside of the glass.

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Manley Labs INTEGRATED AMPLIFIER owner manual Troubleshooting
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INTEGRATED AMPLIFIER specifications

Manley Labs has a long-standing reputation for producing high-fidelity audio equipment, and their integrated amplifier is a shining example of this legacy. Catering to audiophiles who appreciate both performance and finesse, the Manley Labs Integrated Amplifier combines powerful technology with artistic design.

One of the most notable features of the Manley Labs Integrated Amplifier is its renowned vacuum tube design. Utilizing high-quality 12AX7 and 12AT7 tubes, the amplifier delivers warm, rich sound that is characteristic of tube amplification. This vintage-inspired technology creates a unique listening experience, offering dynamic range and harmonic richness that solid-state amplifiers often struggle to replicate. Additionally, the product’s advanced circuitry ensures low distortion and excellent frequency response.

An elegant chassis houses this sophisticated amplifier, enhancing both aesthetics and acoustic performance. The front panel is designed with simplicity in mind, featuring easily accessible volume controls and inputs for a variety of sources, including vinyl turntables, digital sources, and streaming devices. The dual-mono topology, where each channel has its dedicated power supply and amplification, further enhances stereo imaging and separation, resulting in a more immersive soundstage.

The Integrated Amplifier is equipped with Manley’s proprietary features, including a passive volume control and selectable equalization options. This helps users customize their listening experiences according to personal preferences or their specific audio setups. With a high output power rating, the amplifier is capable of driving a wide range of loudspeakers, making it versatile for various audio configurations.

Another key characteristic is the incorporation of modern connectivity options while maintaining a classic sound. With balanced and unbalanced inputs, as well as headphone outputs, the Manley Labs Integrated Amplifier combines traditional tube warmth with contemporary flexibility. This adaptability allows it to remain relevant in a rapidly evolving audio landscape.

Overall, the Manley Labs Integrated Amplifier is a harmonious blend of cutting-edge technology and classical appeal. Its meticulous craftsmanship, attention to detail, and performance capabilities make it a preferred choice for connoisseurs of exquisite sound quality, ensuring that music is delivered with authenticity and elegance. Whether for home listening or professional applications, this integrated amplifier stands as a testament to Manley Labs' commitment to audio excellence.
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