B&H Photo Video Pro Audio The Professional's Source 800.606.6969 / 212.444.6615
0 $0.00
Your cart is currently empty

You have 0 items in your cart

View Cart & Begin Checkout

N.Y.C. Store Pickup Ready Within the Hour

Samson Servo 120 Power Amplifier

B&H # SASA120 MFR # SA120A
In Stock
Order in the next 00:00:00 hours to ship Today

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 (1RU)
Show moreShow less

You Pay: $199.99

What item is right for you?

Ask our Experts!

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

The Servo 120 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 120 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, 1RU space unit
Power Rating Stereo @ 4 ohms: 60 watts per channel
Stereo @ 8 ohms: 50 watts per channel
Bridged @ 8 ohms: 120 watts
Damping Factor >150
Input Sensitivity + 4dBu to achieve rated power (level control set to maximum)
Input Impedance >10k ohms balanced/>10k ohms unbalanced
Gain Not specified by manufacturer
Frequency Response 10Hz to 20kHz
Signal-to-Noise Ratio 105dB (22Hz to 22kHz bandwidth @ dB below rated output power)
Total Harmonic Distortion (THD) <0.01%, 80kHz LPF @ 1kHz, 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, 1 x Power LED
Cooling Convection
Power Consumption 240W @ 120 V/60Hz
Dimensions 19" x 11 1/2" x 1 3/4"
Weight 15.6 lbs (7.08kg)
Specialties Front-panel speaker on/off switch and dedicated headphone jack enables private cue monitoring of the input signal
Samson Servo 120 Power Amplifier
  • AC Power Cord
  • Limited 1-Year Warranty

    by PowerReviews
    SamsonServo 120 Power Amplifier

    (based on 4 reviews)

    Ratings Distribution

    • 5 Stars



    • 4 Stars



    • 3 Stars



    • 2 Stars



    • 1 Stars




    of respondents would recommend this to a friend.

    Reviewed by 4 customers

    Sort by

    Displaying reviews 1-4

    Back to top


    Excellent bang for your buck

    By petarm

    from USA

    About Me Experienced

    Verified Buyer


    • Easy To Use


      Best Uses

      • Events

      Comments about Samson Servo 120 Power Amplifier:

      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.

      Share this review


      A good bargain

      By Lrak

      from L'ville,NJ

      About Me Experienced

      Verified Buyer


      • Easy To Use
      • Excellent Sound
      • Portable
      • Powerful


        Best Uses

        • Home Studio
        • Performances

        Comments about Samson Servo 120 Power Amplifier:

        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.

        Share this review


        Bargain for Project Studio or Edit Bay

        By Cinematiks

        from San Francisco, CA

        About Me Professional, Tech Savvy

        Verified Reviewer


        • Clean Sound
        • Durable
        • Easy To Set Up
        • Good Power


        • Power consumption

        Best Uses

        • Home Theater
        • Larger Rooms
        • PA systems
        • Project Studio
        • Video Edit Workstation

        Comments about Samson Servo 120 Power Amplifier:

        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.

        Share this review

        (1 of 1 customers found this review helpful)


        Servo 120a fits the bill

        By SmokeySounds

        from Houston, TX

        About Me Musically Inclined, Practical, Professional, Tech Savvy

        Verified Buyer


        • Accurate Controls
        • Clean Sound


        • Difficult To Set Up

        Best Uses

        • Studio Mixer Output

        Comments about Samson Servo 120 Power Amplifier:

        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.

        Share this review


        See more
        Kopul - 2 RCA Male to 2 RCA Male Stereo Audio Cable (3 ft)
        • You Pay: $12.95

        Speaker Cables

        See more
        Monster Cable - Hi-Performance (12 Gauge) Speaker Cable - 15' - Pair
        • You Pay: $34.99

        Power Conditioning

        See more
        ART - PB 4x4 Rackmount 8 Outlet Power Conditioner & Surge Protector
        • You Pay: $49.00


        See more

        Headphones are essential for real-time monitoring and mixing.

        Polsen - HPC-A30 Closed-Back Studio Monitor Headphones
        • You Pay: $29.99
        Sennheiser - HD 202-II Closed-Back On-Ear Stereo Headphones
        • You Pay: $23.22

        Cases & Protection

        See more
        Gator Cases - GR2L Standard Rack Case
        • You Pay: $149.99
        Raxxess - ER-12 Space Economy Rack (Black Oak)

        Books & Tutorials

        See more
        Focal Press - Book: Mixing Secrets For The Small Studio, 1st Edition
        • You Pay: $29.95
        Special Order ?
        This is a Special order item. Est. arrival at B&H is 4-6 weeks (subject to availability). Your order will be charged at time of shipment. Item is non-cancelable and non-returnable.
        PayPal Orders
        PayPal orders will be charged when the order is placed.
        International Orders
        For international orders, credit cards will be charged at time you place your order.
        View all Accessories
        See any errors on this page? Let us know.