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INTRODUCTION
!
THANK YOU!...
for choosing the Manley 250/100 Monoblock Amplifiers. Designed by David Manley, the Manley 250/100
Monoblock Amplifiers use only the best available components, with the shortest and cleanest signal path possible,
and with the use of our own in-house CNC machine shop we can provide you with a amplifier that looks as good
as it sounds.
The circuit and the components used have been chosen carefully after years of development and refinement for
reliability, constancy and most importanly, musical, accurate, and emotional delivery of the sound. The circuit
topology is similar to other designs in the MANLEY range. This amplifier is configured to switch between triode
or tetrode operation which allows the user to choose between the sonic benefits and seductive qualities of triode
and the more powerful tetrode operation mode. We emphasize big, beefy reservoir capacitors in the high voltage
supplies giving plenty of instant energy for dynamic performance of transient peaks and bass performance which
often exceeds that of rival solid-state amplifiers. We run high voltages on the plates of the output tubes and are
thus able to run them at lower current which will result in longer life for the output tubes, and careful use of the
'EVER-WARM' power switching should also greatly increase the life of the output tubes as well as allowing your
amplifiers to always be ready for pleasurable listening. Each output tube has its own bias adjust, and the
procedure for adjusting each tube's current draw is described in this manual. The output transformer is a
revolutionary new design by David Manley which is wound on the Manley Labs factory premesis. Its stellar
performance will be obvious upon first listening. The secret is in keeping both phases of the push-pull halves
always equal, and in this new output transformer design, David has achieved just that. The output transformer has
been factory set for an optimum 5 ohm load which will drive most speakers.
Thank you again, and please enjoy!
GENERAL NOTES
LOCATION & VENTILATION
The Manley 250/100 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
do get hot during operation.
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
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.
WARNING!
TO PREVENT THE RISK OF ELECTRIC SHOCK
DO NOT OPEN THE CABINET
REFER SERVICING TO
QUALIFIED PERSONEL