NAD 2155 Vintage Stereo Power Amplifier – 55 WPC, Bridgeable
$395.00
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Other power amps we have in stock now
3 in stock · $395.00–$495.00 · all ship
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Give your next receiver Bluetooth.
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RA-Twin II, $39.00 →NAD 2155 Stereo Power Amplifier 55 WPC – Tested, Working Perfectly
Experience high-current, dynamic amplification from the classic NAD 2155 power amplifier—fully tested and working flawlessly. This reliable amp is an excellent choice for upgrading from a low-powered receiver, pairing with a separate preamp, or adding serious muscle to any vintage or modern audio system.
The NAD 2155 delivers a conservatively rated 55 watts per channel (8 or 4 ohms, stereo), but thanks to NAD’s unique high-headroom design and powerful output stage, it effortlessly handles demanding speakers down to 2 ohms and produces bursts of dynamic power up to 110 watts/channel for musical peaks. For even greater output, the 2155 can be operated in bridged mono mode at 125 watts per channel continuous, or up to 250 watts for short-term peaks—perfect for driving larger speaker systems.
Classic NAD features include the Soft Clipping™ circuit for smoother sound at maximum levels, a heavy transformer and output stage capable of 40 amps peak current, and an impedance selector for optimal performance with different load types. The amplifier is praised for clean, full-bodied sound with precise control—musical, punchy, and refreshingly free from harshness.
Key Features:
55W x 2 stereo output (8/4 ohms), or 125W bridged mono
Dynamic power: up to 110W/ch (stereo), 250W bridged
Soft Clipping™ circuit minimizes distortion at high output
High-current output stage—handles speakers down to 2Ω
Impedance selector for optimal speaker matching
Inputs: Standard stereo RCA, switchable normal/bridged
Outputs: Dual A/B heavy-duty binding posts
Dimensions: 420 × 108 × 380 mm (16.5″ × 4.25″ × 15″)
Weight: 7.8 kg (17.2 lbs)
Year: 1985–1987
Musically accurate and robust, the NAD 2155 is a versatile building-block amplifier for audiophiles and serious listeners. It’s equally at home powering vintage British speakers or modern towers—and can be combined with a second 2155 for huge output via bridging.
Asking $395; buy with confidence and benefit from Radique’s “Bumper to Bumper” warranty and Perpetual trade back policy.
| Weight | 20 lbs |
|---|---|
| Dimensions | 19 × 20.5 × 8.25 in |
NAD began in London in 1972 as New Acoustic Dimension, a brand created by a group of hi-fi distributors and led by American audio executive Martin L. Borish. Since 1999 it has been part of Lenbrook of Pickering, Ontario, which also owns PSB. We carry NAD stereo receivers and AV receivers, integrated and power amplifiers, phono preamps and CD players. We've had more than 110 NAD listings so far, covering nearly 70 different models. Every used NAD here is inspected, tested and serviced as required, then photographed in-house and covered by our Bumper-to-Bumper Warranty and Perpetual Trade-Back Program. Don't see the model you want? Tell us on First Dibs and we'll email you when one arrives.
Our five best-selling NAD models so far: the 2150 power amplifier, the 705 and 7020e stereo receivers, the T 531 DVD and CD player, and the 7140 receiver.
The NAD story, 1972 to today
NAD began in London in 1972, when a group of hi-fi distributors organized by Martin L. Borish, then of Acoustic Research, planned a new brand of affordable electronics they could sell: New Acoustic Dimension. Borish left his post as president of Acoustic Research in 1976 to run NAD full time, and in its early years NAD was run from his London apartment.
The 3020. Norwegian-born engineer Bjørn Erik Edvardsen designed the NAD 3020 integrated amplifier, introduced in 1978 at 20 watts per channel and built in Taiwan. It sold well over a million units, and Stereophile named it one of the 100 most significant audio products of its first 40 years. NAD calls it the best-selling hi-fi amplifier in history.
From distributors to owners. Lenbrook became NAD's Canadian distributor in 1978. In the 1990s NAD was owned by the Scandinavian distributor AudioNord, and in 1999 the Lenbrook Group of Pickering, Ontario, bought it.
Today. NAD is still part of Lenbrook, alongside PSB and Bluesound. Its range runs from C-series integrated amplifiers such as the C 320BEE, named with Edvardsen's initials, to direct-digital designs and the Masters Series. The C 3050 LE of 2023, a 50th-anniversary model, was limited to 1,972 units.
Which NAD is which?
1970s receivers: early models such as the 160 and 160a.
The 3020 family (from 1978): the 3020 and 3020e integrated amplifiers, and receivers such as the 7020 and the 7020e of 1988, which shares the 3020e's amplifier section.
1980s amplifiers: the 3140 and 3150 integrated amps and the 2150 and 2200 power amps, many with NAD's soft-clipping and bridging switches. Our best-selling 2150 is a 50-watt-per-channel power amp from the early 1980s.
Later receivers: the 7140 (about 1984 to 1989), the Monitor Series 7100 and its siblings from 1988, and the 705 of the early 1990s.
Home theatre: T-series AV receivers such as the T 757, whose Modular Design Construction lets the receiver be upgraded with new modules, and the T 531 DVD and CD player.
C-series and Masters Series (2000s on): the C 320BEE and later C-series integrated amps, the direct-digital C 390DD, and the Masters Series.
Buying used NAD: what to check
Pre-out and main-in jumpers. Many NAD integrated amps split the preamp and power amp at the back panel. If the jumpers between pre-out and main-in are missing, the inputs play nothing, so make sure they are there.
Switches on the back. Many 1980s NADs have soft-clipping, bridging or impedance switches. An amp that sounds wrong may just have one set oddly, so check every switch before blaming the amp.
Age. Technicians restoring 3020s report blown fuses, failed output transistors and leaky capacitors, and reviewers call cleaning the selectors and volume control almost mandatory on 1980s units. Ask what has been done.
Receivers. On late-1980s Monitor Series receivers, test every front-panel button, both speaker relays and the preset memory. The 7140's display can fail, though it can be repaired.
Disc players. Play both a CD and a DVD in a T-series player before you buy.
Everything we list is inspected, tested and serviced as required here, and comes with our warranty.
Related Products
Rotel RB-870 Stereo Power Amplifier – 60 WPC, Bridgeable
Sixty watts a channel into 8 ohms at 0.03% distortion, a damping factor of 280, and response running out to 120kHz. A rear-panel switch bridges the two channels into a single 120-watt mono amplifier, so a second one later gives you monoblocks. The speaker terminals clamp bare wire or spades only — no bananas. Very good condition, inspected and tested.
Hafler DH-200 Vintage Power Amplifier – 100 WPC, MOSFET, USA
David Hafler's second act, and the amplifier that put MOSFETs into American hi-fi.
✔️ Condition: Very Good
✔️ Covered by Radique Warranty
✔️ Includes Perpetual Trade-Back Program eligibility
✔️ Expertly packed for safe shipping
