Connecting Your Amplifier

Setting up your amplifiers is rather easy.

1.Connect all source components (turntable, CD, Tuner, Tape DAT, etc.) to your preamplifier or switching center.

2.Connect the interconnects from the output of the preamplifier to the RCA input on the top rear of the amplifiers.

3.Connect the hot or "+" speaker cable to the red binding post and the common or "-" speaker cable to the black binding post (See diagarm 2). Ensure that the other end of the cable is connected correctly to the speaker. Tighten the binding posts by hand. If you use a nut-driver (3/8") do not over-tightenthe posts or you may break the connections inside the amplifier.

4.Ensure that the "mains" switch on the front panel is in the "off" or "0" position. If the 807s are not inserted - do it now - .

5.Turn on Preamplifier and any source components you plan to use.

6.Plug Amplifiers into wall outlets.

7.Set both amps up at the same SE or PP settings. SE is a good place to start.

8.Switch the square mains power switch to the ON or "1" position and allow the amplifier a minute or so to 'warm up'. The glowing panel and glowing tubes will indicate that the amplifier is on.

9.Turn up the volume on the preamp and enjoy. If something is "humming" don't panic. All you need to do is use a "3 pin to 2 pin AC adapter" or "cheater". The problem is too many grounds - you should only have one. Check out the next section for help with hum.

10.Now, while music is playing, try switching to PUSH / PULL. The difference may or may not be subtle. Choose the mode you like best with this music. There may be a distressing "click" as you switch - this is normal.

GROUNDING and POWER:

In the event of HUM we suggest that you alter the ground scheme. Electronic gear often has 3 pin grounds for safety reasons and international regulations. Unfortu- nately audio equipment is also prone to sensitivity to ground loops. The usual cure is to use 3 pin to 2 pin AC adapters availble at most hardware stores for about a dollar. Do not break off the AC ground pin.

With the power off, try an adapter on ONE of the amps. If you have other units such as preamps or CD players with 3 pin AC plugs, use adapters here as well. The goal is to have ONLY ONE piece of equipment connected to AC ground via AC plugs. Other gear is grounded via the RCA interconnects. Only after all connec- tions have been made should you turn on the power with the amplifiers being last on and first off always.

A different alternative is to ground the preamp and to use adapters on every other piece of gear with 3 pin AC plugs. Alas, few preamps have AC ground pins.

A third alternative is to use "balanced AC" (60-0-60) transformers to power all the equipment. The latest revision of the USA electrical codes allows this as a "legal" technique. It works very well at reducing many types of noise 10 to 15 dB.

75/150 SE/PP 807 MONOBLOCK specifications

The Manley Labs 75/150 SE/PP 807 Monoblock amplifier is a hallmark of high-fidelity audio engineering, combining vintage tube technology with modern design principles to deliver engaging sound quality. Crafted with precision, this monoblock amplifier stands as a testament to Manley’s commitment to exceptional audio performance.

One of the standout features of the 75/150 SE/PP 807 is its unique tube configuration. Utilizing the 807 power vacuum tubes, this amplifier can switch between single-ended (SE) and push-pull (PP) modes, providing users with flexibility to choose their preferred sound signature. In SE mode, the warm and rich characteristics of tube amplification are highlighted, while PP mode delivers greater power and headroom, making it suitable for driving demanding speaker loads.

The amplifier’s power output is another key characteristic, with the ability to deliver 75 watts in SE mode and up to 150 watts in PP mode. This versatility enables it to drive a wide range of speakers effectively, making it an ideal choice for audiophiles who appreciate the subtleties of their music. The use of high-quality components throughout, including custom-wound transformers, ensures excellent frequency response and minimal distortion, contributing to the amplifier's overall clarity and depth.

Incorporating advanced technologies, the Manley Labs 75/150 features a fully balanced design, which aids in reducing noise and interference, achieving a highly detailed soundstage. The hand-wired circuitry is constructed with a focus on reliability, ensuring that each unit meets the rigorous demands of professional audio environments as well as high-end home audio setups.

Additionally, the amplifier is equipped with multiple inputs, allowing seamless integration into various audio systems. An easy-to-use front panel interface provides control over the amplifier’s functions, while its sleek, elegant design makes it a visually appealing component in any audio rig.

Overall, the Manley Labs 75/150 SE/PP 807 Monoblock is an outstanding choice for audio enthusiasts seeking a blend of classic tube warmth and modern power, delivering uncompromising performance and unmatched musicality for a wide array of listening experiences. The attention to detail in both design and engineering makes this amplifier a true gem in the world of high-end audio.