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READ THIS PAGE BEFORE YOU SET UP THE AMPS, PLEASE
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.
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.
WARNING!
TO PREVENT THE RISK OF ELECTRIC SHOCK DO NOT OPEN THE CABINET.
REFER SERVICING TO QUALIFIED PERSONEL.
GENERAL NOTES
LOCATION & VENTILATION
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.