Rack Mounting; Tube Replacement; Specifications - SWR SM-900 Owner's Manual

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.
A 12AX7 dual triode vacuum tube (valve)
is at the core of your SM-900 pre-amplifier.
Typically a 12AX7 tube
years, but through heavy use and frequent
transportation jarring, it is possible to have a
tube last less than a year.
PART NUMBERS
POWER REQUIREMENT
POWER AMP MINIMUM IMPEDANCE: 4Ω
PRE AMP
SENSITIVITY AT FULL POWER: 22mV (Passive);
TONE CONTROLS
VARIABLE GRAPHIC EQ: ±15dB @ Frequency knob setting
EFFECTS LOOP
RETURN IMPEDANCE: 27kΩ
BALANCED LINE OUT
MAIN FUSES 100V-120V MODELS: T12A, 250V
230V-240V MODELS: T6.3A, 250V
SPEAKER FUSES
DIMENSIONS
WEIGHT
10

Rack Mounting

Tube Replacement

will last several

Specifications

4400300010 (120V, 60Hz) USA
4400304010 (230V, 50Hz) UK
4400307010 (100V, 50Hz) JPN
1400W
SENSITIVITY: 1.67V RMS, 100Hz @ Mono Return
POWER OUTPUT: 900W @ 4Ω (Bridge Mode);
400W @ 8Ω (Bridge Mode);
INPUT IMPEDANCE: 800kΩ (Passive);
BASS: ±15dB @ 80Hz
TREBLE: ±15dB @ 2kHz
SEND IMPEDANCE: 100Ω
SEND IMPEDANCE: 1.5kΩ
F10A, 250V
HEIGHT: 3.5 in (8.9 cm)
WIDTH: 19 in (48.3 cm)
DEPTH: 13.75 in (34.9 cm)
35 lb (15.9 kg)
Product specifications are subject to change without notice.
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.
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.
4400303010 (240V, 50Hz) AUS
4400306010 (230V, 50Hz) EUR
400W @ 4Ω per channel (Stereo Mode)
175W @ 8Ω per channel (Stereo Mode)
60kΩ (Active)
87mV (Active)