13
The SM-1500 requires three full rack spaces and because of its
weight, should only be mounted at the bottom of a rack case that
is equipped with both front and rear rack rails. Rear rack ears are
included for this purpose. If mounted in an upper rack space or in a
rack case with only front rails, additional support must be installed
below the SM-1500 to prevent flexing of the amplifier's chassis which,
over time, can damage the amplifier and void warranty coverage.
To mount the rear rack ears to your SM-1500, position the ears (1) and
loosely attach them to the SM-1500 chassis with the included bolts
(2). Next, support the SM-1500 in place while you attach the rear rack
bolts (3) as shown. When in place and supported, tighten all bolts.
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-1500 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-1500 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 (breakers, cords, etc.), have an
authorized service center inspect your amplifier for tube failure.
PART NUMBERS 44-01400-000 (120V, 60Hz) USA 44-01403-000 (240V, 50Hz) AUS
44-01404-000 (230V, 50Hz) UK 44-01406-000 (230V, 50Hz) EUR
44-01407-000 (100V, 50/60Hz) JPN
POWER REQUIREMENT 1400W
POWER AMP MINIMUM IMPEDANCE: 4Ω (Bridge Mode);
2Ω per channel (Normal, Stereo, Bi-Amp Modes)
SENSITIVITY: 1.2V RMS, 1kHz @ Mono Return, Effects Blend at WET, Volume at MAX
POWER OUTPUT: 1500W @ 4Ω (Bridge Mode);
750W @ 2Ω per channel (Normal, Stereo, Bi-Amp Modes)
PRE AMP INPUT IMPEDANCE: >820kΩ (Front panel Inputs);
10kΩ (Rear panel Input)
SENSITIVITY FOR FULL POWER: 13mV @ 1kHz, Gain and Volume at MAX, all Bass, Mid and Treble controls flat (center detent),
Aural Enhancer at mid position, Effects Blend at DRY, Bass Intensifier, Compression and Boost OFF
TONE CONTROLS BASS: ±15dB @ 70Hz
TREBLE: ±15dB @ 3kHz
VARIABLE SEMI-PARAMETRIC EQ: MID 1: ±15dB @ 30Hz–200Hz
MID 2: ±15dB @ 165Hz–1.1kHz
MID 3: ±15dB @ 900Hz–6kHz
COMPRESSION GAIN REDUCTION: –22dB maximum, selectable PRE or POST EQ
THRESHOLD: –10dBV to +10dBV
RATIO: 1:1 to 20:1
ATTACK TIME: 10mS to 600mS
RELEASE TIME: 500mS to 5.5S
EFFECTS LOOP SEND IMPEDANCE: 220Ω
RETURN IMPEDANCE: 10kΩ Balanced
BALANCED LINE OUT SEND IMPEDANCE: 50Ω
ACTIVE CROSSOVER RESPONSE: 3–pole (18dB/octave) Butterworth
CROSSOVER FREQUENCY: 100Hz–2.0kHz
FOOTSWITCH 4–button (0072471000)
DIMENSIONS HEIGHT: 5.5 in (14 cm)
WIDTH: 19 in (48.3 cm)
DEPTH: 19.5 in (49.5 cm)
WEIGHT 67 lb (30.4 kg)
Product specifications are subject to change without notice.
Rack Mounting
Specifications
Tube Replacement