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INTRODUCTION
THANK YOU!...
for choosing the Manley 500/200 Monoblock Amplifiers. Designed by David Manley, the Manley 500/
200 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 resevoir 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. Careful use of the 'EVER-WARM'
power switching should also greatly increase the life of the output tubes as well as allow 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 FEEDBACK &
SLOPE controls featured on the 500/200 allow the user to optimise the amplifier-speaker interface.
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!