Ab C Def

INPUT SELECT	VOLUME
AUX
CD	HEADPHONES
TAPE
TUNER
VIDEO

LINE OUTPUT

HEADPHONES

OFF

A - INPUT SELECT - 5 Position switch for input selection. Each input is electrically identical. The RECORD OUT directly follows this switch. There is no buffer amp to isolate the effects of loading and cable capacitance so we recommend disconnecting any interconnect cables from the RECORD OUT if you are not recording.

B - VOLUME - 24 Position switch with precise 2 dB steps of attenuation throughout most of the range. The most counter-clockwise position is mute, then -70, -60, -50, -46, -44, -42, -40 etc in 2 dB steps until -10, then the next position is -6, then 0. This gives a wide range with good resolution in the middle. The preamp has 18 dB of total voltage gain thus unity gain is the 19th step. Left / right matching is typically within 1/10 dB at any setting.

C & D - HEADPHONE JACKS - Standard 1/4" stereo headphone jacks. The HEADPHONE IMPEDANCE SWITCH should be set for the range that best matches your headphones. The OUTPUT SELECT SWITCH (E) should be set to HEADPHONES. The maximum power output primarily depends on the actual headphone impedance. Typically the preamp can deliver 1 watt (10 volts RMS ) into 100 ohms and 1 watt (25 volts RMS) into 600 ohms. These outputs are transformer coupled so there is the highest possible isolation from shock hazards, cable shorts, and other potential problems.

E - BACKLIT PANEL - This is the power indicator.

F - POWER SWITCH - UP is ON, Down is OFF. Because tubes require some time to warm up there is about 10 seconds of silence followed by "not good sound" before "wow". The best way to power up the system is sources ( CD, turntable, etc) first, then this preamp, then after a 30 second wait - turn on the amplifiers. Wait a minute or so - then play tunes. This allows everything to warm up. Some people hear a difference after an hour or two but it depends on the equipment. Powering down is the opposite order - power amps first. This procedure is a good habit to follow because it stresses the speakers and ears the least.

The power supply in this preamp is tube based which has the inherant advantage of slow start (as the tubes warm up). This gives the least stress to the internal components.

300B specifications

Manley Labs 300B is a high-fidelity tube amplifier that has gained a reputation among audiophiles for its exceptional sound quality and craftsmanship. This amplifier is named after its use of the 300B vacuum tube, a component famous for producing a warm, rich sound that is both detailed and engaging. The Manley Labs 300B amplifier has become a reference point for those who appreciate the artistic qualities of sound reproduction.

One of the key features of the Manley Labs 300B is its fully balanced design, which helps to minimize noise and distortion. This design approach allows for greater dynamic range and clarity in the audio signal. The use of premium components throughout the circuit further enhances performance, ensuring that every note is rendered accurately and with depth.

In terms of power, the Manley Labs 300B delivers 8 watts per channel in a class A operation, which is a hallmark of high-end audio equipment. While this may seem modest by modern standards, the quality of sound produced is often more important than sheer wattage. The 300B’s output stage offers a creamy and dynamic sound, excelling particularly with vocal and instrumental music, where it conveys subtle details with remarkable fidelity.

Another significant aspect of this amplifier is its flexibility in terms of speaker compatibility. It is designed to drive a variety of speakers, making it a versatile choice for different listening environments. The Manley 300B supports both 4 and 8-ohm output impedance settings, allowing users to match it to their favorite loudspeakers for optimal performance.

Additionally, the amplifier's construction is noteworthy. It features a robust chassis that not only reduces resonance but also adds to the overall durability of the unit. The hand-built nature of the Manley Labs 300B ensures that each piece is crafted with meticulous attention to detail and quality.

The Manley Labs 300B also comes equipped with a rich array of features, including an input selector, volume control, and high-quality binding posts for speaker connections. These components are not just functional; they also reflect Manley’s commitment to providing a user-friendly and high-performance experience.

In summary, the Manley Labs 300B is a sophisticated and beautifully crafted tube amplifier that offers a level of sonic performance that is hard to match. Its combination of high-quality components, thoughtful design, and powerful performance make it a standout choice for audiophiles seeking a true musical experience. Whether used in a dedicated listening room or as part of a larger audio setup, the Manley Labs 300B delivers a sound that is both engaging and lifelike.