The SM-900 requires two full rack spaces (3 1/2") and should
be mounted at the bottom of the rack case. If mounted in any
other rack space, additional support should be installed below
the SM-900 to prevent continuous flexing of the amplifier's
chassis which, over time, can damage the amplifier and void
warranty coverage.
Please routinely check the mounting and chassis screws
which can vibrate loose due to transportation and use. We
recommend that at least once a month that the SM-900
be removed from the rack case and all outside screws be
tightened and all connections in your rack case be checked to
preserve the beauty and reliability of your equipment.
A 12AX7 dual triode vacuum tube (valve)
is at the core of your SM-900 pre-amplifier.
Typically a 12AX7 tube will last several
years, but through heavy use and frequent
transportation jarring, it is possible to have a
tube last less than a year.
When to replace the preamp tube: Sometimes, tubes become
noisy or “microphonic” (the amp sounds like a glass chime
tinkling during certain notes) as they wear out, but other
times, tubes will fail without warning. If your amplifier stops
working and other possible causes have been eliminated
(fuses, cords, etc.), have an authorized service center inspect
your amplifier for tube failure.
PART NUMBERS 4400300010 (120V, 60Hz) USA 4400303010 (240V, 50Hz) AUS
4400304010 (230V, 50Hz) UK 4400306010 (230V, 50Hz) EUR
4400307010 (100V, 50Hz) JPN
POWER REQUIREMENT 1400W
POWER AMP MINIMUM IMPEDANCE: 4
SENSITIVITY: 1.67V RMS, 100Hz @ Mono Return
POWER OUTPUT: 900W @ 4 (Bridge Mode); 400W @ 4 per channel (Stereo Mode)
400W @ 8 (Bridge Mode); 175W @ 8 per channel (Stereo Mode)
PRE AMP INPUT IMPEDANCE: 800k (Passive); 60k (Active)
SENSITIVITY AT FULL POWER: 22mV (Passive); 87mV (Active)
TONE CONTROLS BASS: ±15dB @ 80Hz
TREBLE: ±15dB @ 2kHz
VARIABLE GRAPHIC EQ:
±15dB @ Frequency knob setting
EFFECTS LOOP SEND IMPEDANCE: 100
RETURN IMPEDANCE: 27k
BALANCED LINE OUT SEND IMPEDANCE: 1.5k
MAIN FUSES 100V-120V MODELS: T12A, 250V
230V-240V MODELS: T6.3A, 250V
SPEAKER FUSES F10A, 250V
DIMENSIONS HEIGHT: 3.5 in (8.9 cm)
WIDTH: 19 in (48.3 cm)
DEPTH: 13.75 in (34.9 cm)
WEIGHT 35 lb (15.9 kg)
Product specifications are subject to change without notice.
10
Tube Replacement
Rack Mounting
Specifications
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