Manley Labs SE/PP 300B guide

READ THIS PAGE BEFORE YOU SET UP THE AMPS, PLEASE

IMPORTANT Never operate this amp without a speaker or load connected. Never drive this amp into a short circuit. Most solid state amps can be operated without a load or speaker and some can drive a short circuit because of protection circuitry. These are different - Like most tube amps the output power is less affected by changing the load impedance within the range of 4 to 16 ohms, however extremes like a short or open circuit are to be avoided. The result could be damage to transformers, tubes. The warranty does not cover this damage if it occurs.

INSERTING TUBES

We ship these amplifiers with the 300B tubes boxed separately because they are fragile and expensive. You will have to insert these before turning the amplifier on. Carefully upack the 300B tubes from their box and ensure they have not been physically damaged. We have labelled each tube and its corresponding socket. Notice that there are two thick pins and two thinner pins on the base of the 300B. The two thick pins MUST be alligned and oriented to go into the two larger holes in the socket. It is possible to plug this tube in the wrong way - so pay careful attention to the pin alignment on these tubes. Now plug the right tube into the right socket the right way. This is easy but important.

GENERAL NOTES

LOCATION & VENTILATION

Pay special attention to pin alignment ! The 2 small pins must go into the 2 small socket holes.

The tubes must be inserted carefully and speakers connected before turning the amp on.

The Manley SE/PP 300B Monoblock Amplifiers must be installed in a stable location with ample ventilation. Allow a minimum of 2 inches of clearance on the top and sides of the amplifiers, such that a constant flow of air can flow. Do not place amplifiers directly on high pile carpet or any other surface that will block the ventilation vents underneath the amplifiers. If you have small children or pets, you should consider placing the amplifiers out of reach to prevent damage to the amplifier or damage to your small children or pets by the amplifier as the tubes

WATER & MOISTURE

As with any electrical equipment, these amplifiers should not be used near water or moisture. If liquid enters the amplifier, it must be immediately returned to your dealer for servicing.

SERVICING

The user should not attempt to service the amplifier beyond that described in the owner's manual. Refer all servicing other than biasing and tube replacement to Manley Laboratories

SPECIAL NOTES

Before turning the amps on - Connect your preamp to the amp inputs then turn the preamp on. Tubes may become loose during transit. Straighten and press down each tube before plugging the amplifier into the mains socket. Furthermore, do not touch the tubes after the amplifier has been switched on, as the tubes become very hot during operation and should only be handled after the power has been turned off and the tubes have cooled.

HUM

As with most monoblock amps with the 3 pin IEC power connectors, you may need one or two "3 pin to 2 pin" power adapters or "cheaters". This will stop ground loop related hum. Usually only one amp will need this.

WARNING!

TO PREVENT THE RISK OF ELECTRIC SHOCK DO NOT OPEN THE CABINET. REFER SERVICING TO QUALIFIED PERSONEL.

SE/PP 300B specifications

Manley Laboratories is renowned for its commitment to high-quality audio engineering, and the SE/PP 300B amplifier exemplifies this dedication. This powerful vacuum tube amplifier is designed for audiophiles who demand the best in sound quality and performance.

One of the main features of the SE/PP 300B is its ability to operate in both Single-Ended (SE) and Push-Pull (PP) modes. This versatility allows users to experience the distinctive sonic character of both configurations. Single-ended operation is known for its rich and warm sound, whereas push-pull offers greater power efficiency and reduced distortion. The ability to switch between these modes gives the SE/PP 300B a unique edge, allowing users to tailor their listening experience to their preferences.

The heart of the SE/PP 300B lies in its use of the 300B vacuum tube, famous for its musicality and smooth tonal characteristics. These tubes are celebrated for their warm midrange and natural articulation, making them ideal for a wide range of musical genres. The design of the amplifier ensures that these tubes operate in an optimal manner, contributing to an overall performance that is both dynamic and refined.

Manley's engineering team has incorporated advanced technologies to enhance performance. The SE/PP 300B features a high-quality power supply that minimizes noise and maximizes headroom. This ensures that the amplifier maintains its integrity even at high volume levels. Furthermore, the use of high-grade capacitors and transformers helps achieve a rich soundstage with intricate detail and depth.

Another significant characteristic of this amplifier is its user-friendly design. With straightforward input and output options, as well as easy access to the tube sockets, users can effortlessly service the unit if needed. The aesthetic of the SE/PP 300B is also noteworthy, sporting a classic look that harks back to the golden age of audio while incorporating modern finishing touches.

In conclusion, the Manley Labs SE/PP 300B is a versatile and highly regarded vacuum tube amplifier that marries classic audio traits with contemporary engineering. Its ability to operate in both Single-Ended and Push-Pull modes, combined with the legendary sound of the 300B tubes, positions it as a flagship offering for those who appreciate and seek the highest quality in audio reproduction. Whether for casual listening or serious audiophile pursuits, the SE/PP 300B promises to elevate any audio experience.