Samson Servo 120a Power Amplifier

Samson Servo 120a Power Amplifier

Samson Servo 120a Power Amplifier

B&H # SASA120 MFR # SA120A
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Product Highlights

  • Stereo or Bridged Mono Operation
  • For Recording/Live Performance/Installs
  • 50W per Channel into 8 Ohms
  • Stable Bipolar Circuit Design
  • High-Current Transistors
  • Protection Relay Circuitry
  • Front Headphone Jack
  • 5-Segment LED Metering per Channel
  • Convection Cooled
  • Rack-Mountable (1 RU)
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Samson Servo 120 overview

  • 1Description

The Samson Servo 120a Power Amplifier is a stereo power amplifier that can be used for all types of recording applications, live performances or permanent installs. The amplifier provides "reference-class" audio performance and reliability in a compact, single rack-space package.

The Servo 120a utilizes high-current output power transistors and features an efficient bipolar circuit design that continuously keeps DC output during idling at or near 0 volts. This keeps idle speakers at their zero point. Thermal and overcurrent protection circuitry is provided, and the amplifier is convection cooled for silent operation, eliminating fan noise and the need for filter maintenance.

The Servo 120a provides balanced 1/4" TRS and RCA coaxial inputs and push-spring terminal outputs. Also included is a front-panel protection light, a headphone output, a speaker on/off switch, and 3-color LED meters.

A stereo power amplifier for recording, live music, and installation applications
Operates in both stereo or bridged mono
50 Watts per channel into 8 Ohms
Stable bipolar circuit design continuously keeps DC output during idling at or near 0 volts, preventing unnecessary power applications to minimize heat overload
Toroidal transformer power supply for high current and low profile
High-current output power transistors
Protection relay circuitry (linked to the DC offset circuitry) that prevents "thumps" when powering on or off
Smart Servo circuitry protection against overheating and overcurrent
Functions in stereo or bridged mono modes
Front-panel headphone jack with speaker disable switch
Five-segment LED meters for each channel continuously display power output levels and allow the user to correct for overloading (clipping) conditions
Convection cooled (no fan)
Compact, 1 RU space unit
UPC: 809164005131
In the Box
Samson Servo 120a Power Amplifier
  • AC Power Cord
  • Limited 3-Year Warranty
  • Table of Contents
    • 1Description

    Samson Servo 120 specs

    Power Rating Stereo at 4 Ohms: 60 watts per channel
    Stereo at 8 Ohms: 50 watts per channel
    Bridged at 8 Ohms: 120 watts
    Damping Factor > 150
    Input Sensitivity +4 dBu to achieve rated power (level control set to maximum)
    Input Impedance > 10 kOhms balanced
    > 10 kOhms unbalanced
    Gain Not specified by manufacturer
    Frequency Response 10 Hz to 20 kHz
    Signal-to-Noise Ratio 105 dB (22 Hz to 22 kHz bandwidth at 1 dB below rated output power)
    Total Harmonic Distortion (THD) < 0.01%, 80 kHz LPF at 1 kHz, rated output power
    Input Connections 2 x 1/4" TRS phono, 2 x RCA coaxial
    Output Connectors 4 x Push-spring terminal
    1 x Headphone
    Controls Front Panel 2 x Rotary input level control (41-position detented)
    Speaker on/off switch
    Power switch
    Controls (Rear) 1 x Stereo/Mono Bridge switch
    Indicators 1 x 5-LED level metering, 1 x Protect LED, 1 x Power LED
    Cooling Convection
    Power Consumption 240 W at 120 VAC / 60 Hz
    Dimensions 19 x 11.5 x 1.75" / 483 x 292 x 44 mm
    Weight 15.6 lb / 7.08 kg
    Specialties Front-panel speaker on/off switch and dedicated headphone jack enables private cue monitoring of the input signal
    Packaging Info
    Package Weight 16.2 lb
    Box Dimensions (LxWxH) 21.5 x 14.0 x 4.0"

    Samson Servo 120 reviews

    Servo 120a Power Amplifier is rated 4.4 out of 5 by 5.
    Rated 4 out of 5 by from Servo 120a fits the bill Works great for my purpose. Rack mounted above my studio mixer, serves as power amp for mixer output. Works great for small jobs not requiring abundant volume. The drawback is the threaded studs for the output - requires bare wire to connect to speakers. Trouble finding bare wire to 1/4 speaker wires.
    Date published: 2008-09-23
    Rated 4 out of 5 by from Bargain for Project Studio or Edit Bay I've bought several of these over the past 10 years for video editing workstations. The audio specs might not be up to what those of you with golden ears would expect in a higher end unit, but they're perfectly adequate for quick & dirty editing jobs. Passive cooling is a big plus and the power output is sufficient for an edit station. The RCA inputs are more useful in a small setup while the balanced TRS jacks are easier to use than the balanced XLR inputs found in in some brands like Crest. (Balanced inputs are required long cable runs and in noisy RF environments) The bridging capability adds flexibility for higher power output - that's a good thing for mono PA installations or driving a subwoofer. They redesigned the case to correct some serious issues (my older 120 has a problem with the rack mount - it needs a rear support to keep it square in the rack - this was fixed in the 120a design). Amplifier output terminals have always been a big gripe, I've never found terminals that met every possible situation. (Probably the most versatile are the original General Radio 5 way binding posts) Even the bare wire push terminals of the original 120 are far more useful than the old Cinch screw terminal strips that were common on power amplifiers made before the 1980's, though you'd best tin the bare ends of speaker cables before inserting. This has been fixed on the 120a, which has 5 way binding posts. Given the recent emphasis on green power, class A audio power amplifiers are the most wasteful possible design. Samsons class AB design cuts down on power consumption and has low distortion provided the rated output power is not exceeded. In future we might expect Samson to adopt more exotic class D, F or G amplifier designs to further reduce idle cower consumption. The B&H photo shows the older 120 model.
    Date published: 2009-01-04
    Rated 4 out of 5 by from A good bargain I use this amp in a small recording studio. The size (1 rack space), price, and sound quality are great. I will use it for live performance too. The only problem was a loose transformer ..., a few turns with a wrench and everything works fine.
    Date published: 2010-01-20
    Rated 5 out of 5 by from Excellent bang for your buck Used in dozens of rooms, projection system ties into this amp, connected to JBL speakers (ceiling or wall). Good sound for low cost. Simple to setup and use.
    Date published: 2012-06-13
    Rated 5 out of 5 by from Great Just what I needed for a 200 sq ft room. VERY quiet -- no hum whatsoever. Sound is excellent. 5-way binding posts would have been nice.
    Date published: 2017-05-16
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