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OPERATIONAL NOTES
SWITCHING ON -- SOFT START
The MANLEY 250/100 is equipped with a SOFT-START circuit which lessens the initial stress the
amplifier takes upon turn-on. We recommend that you use this soft start facility whenever you turn
the amplifier on and especially when cold.
1. Ensure that the "mains" switch on the front panel is in the "off" or "0" position
and the OPERATE / STANDBY switch is in the STANDBY mode.
2. Turn on preamplifiers and all source components you plan to use and let them warm up
for a minute.
3. Switch the square mains power switch to the ON position and allow the amplifier a
minute or so to 'warm up'. The blinking LED will indicate that the amplifier is in
STANDBY mode.
4. Engage the soft-start swich to the OPERATE position. The blinking standby LED will
extinguish.
5. Turn up the volume and enjoy.
THE EVER-WARM MODE
After your listening session, if you wish to leave the amplifier in the energy-saving and 'EVER-
WARM' STANDBY mode, engage the OPERATE/STANDBY switch to the STANDBY position.
The standby blinking LED will remind you that the amplifier is in STANDBY mode. The amplifier
will draw only 400mA (30 watts @120VAC) from the mains outlet-- certainly an energy saving
way to keep your amplifiers always ready to listen to!
TRIODE / TETRODE OPERATION:
With the TRIODE / TETRODE switch, the amplifier may be set for TRIODE or
TETRODE operation. When the switch is in the lower position, the amplifier is in TETRODE
mode which will produce well over 250 watts. When the switch is in the upper position, the
amplifier is in TRIODE mode which will produce half the power of TETRODE operation but as
fans of triodes know, nothing can match that sweet seductive sound of triodes! For some more
demanding energetic music, large rooms, or for power hungry inefficient loadspeakers, you might
find you will need the extra power of tetrode operation. Other times and other situations will find
you very well satisfied with the triode mode. One major rule applies for switching between triode
and tetrode:
THE AMPLIFIER MUST BE TURNED OFF BEFORE SWITCHING BETWEEN
TRIODE AND TETRODE!!!!
Follow turn on SOFT START procedure above when re-powering up the unit.
TUBE LIFE
You should expect extended life from the tubes in your MANLEY 250/100 if you adhere to the
procedures described above and check your bias at least once every 2-3 months. We stock all the
tubes in these amplifiers should you ever need replacements (and at very reasonable prices too!)
FUSES
The fuses used in your amplifier are standard 1/4" x 1 1/4" SLO-BLO types. The correctly rated
fuse has been installed at the factory for your country's voltage. If replacing a fuse, always unplug
the amplifier's power cord from the wall outlet and always use the exact same type and ampere
rating fuse as the one you are replacing. Failure to do so will void your warranty and can be a
dangerous fire hazard. NEVER replace a fuse with thick wire, tin foil, gum wrappers, or anything
else other than the correct fuse!