Manley Labs 75/150 SE/PP 807 MONOBLOCK specification

MANLEY 75 / 150 SE / PP 807 TRIODE MONOBLOCK

H 2

A B C D E

1 2 3 4	M
1 2 3 4	5 6 7 8
H	H
4	5

H 7

Amplifier Overhead View

ARCA Input Jack

BSpeaker Terminals

CB PLUS FUSE - Replace only with same type and value (MDL 1.5)

DMains fuse - Replace only with same type and value

EIEC Mains socket

FOutput Transformer

GPower Transformer

HPower Tube 807 s

IInput Tube 5751

JDriver Tube 7044

KSingle-Ended / Push- Pull Switch

LPower Switch

MBias Adjustment Trimmers (each 807 has a trim and test point numbered)

NBias Test Points (Black test point is Ground)

REPLACING FUSES & LAMPS

The fuses are accessable without removing any panels. Be sure the IEC AC power cable is removed before checking the Mains Fuse. Often a bad fuse will look blackened internally but occasionally will look OK. Replace only with the same type and rating ! For 100 or 120 volt countries the fuse should be a 10 AMP SLO-BLO. For 220 or 240 volt countries it should be 5 AMP SLO-BLO. If a new fuse blows then it is likely there is another problem. Remove the 807s and try again. If the indicator lights, then a tube is bad. At least one of them is the problem.If the fuse blew again - The amplifier needs to be repaired by a competent technician or the factory.

Before removing the B+ Fuse let the power supply fully discharge - this will take at least 1 minute. The cap is removed with a proper sized screwdriver and 1/4 turn anti-clockwise while gently pressing down.The B+ Fuse we use is ceramic and not able to be visually checked - a VOM meter is needed. The symtom will be - lit indicators and glowing tubes but no sound.

The indicator is a fuse style lamp 1.25" X .25", 8 volt, 0.3 amp. The bottom must be removed to access the lamp. Again, wait until the supply discharges.

BIAS ADJUSTMENT TRIMMERS

See the next page for full details - Read the voltage between the black test point and each of the numbered red points. If the reading is not 0.340 volts or 340 mV then adjust the corresponding numbered trimmer.

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.