Used Good (preamp listed separately)
Berendsen STA‑150 Power Amplifier
Overview & Description
The Berendsen STA‑150 is a classic German‑made solid‑state stereo power amplifier crafted by Berendsen Audio‑Elektronik, a boutique manufacturer based near the Dutch‑German border that earned a cult following among high‑end audio enthusiasts in the late 1990s and early 2000s. Handmade in small numbers and built with meticulous attention to component quality and layout, the STA‑150 reflects the company’s philosophy of combining robust engineering with musical transparency and long‑term reliability.
At its core, the STA‑150 is a Class AB amplifier designed to deliver clean, powerful performance across the audible spectrum. With a rated output of 150 W per channel into 8 ohms and a heftier 240 W per channel into 4 ohms, the amplifier can confidently drive a wide range of loudspeakers — from efficient stand‑mounts to larger floor‑standing models. The STA‑150 is engineered around a robust toroidal transformer (approximately 750 VA) and substantial filter capacitance (roughly 60,000 µF in the original STA‑150 version), which supply the current reserves necessary for dynamic musical peaks and low‑frequency control.
The amplifier’s frequency response extends broadly from deep bass to crisp highs, maintaining linearity throughout the range — a characteristic that reviewers and owners have referred to when describing its sound as “clear, open, and transparent.” Although relatively simple in connection (one pair of line‑level RCA inputs and a single pair of binding posts for speakers), the STA‑150 focuses squarely on performance without fuss. This minimalist approach reflects the company’s belief that reducing unnecessary circuitry in the signal path results in a more musical and engaging presentation.
Owners who’ve experienced the STA‑150 often note its strong midrange presence and smooth treble that help convey detail without harshness. Its ample current delivery (greater than 40 A output current) enables solid control of difficult speaker loads, which translates to improved bass grip and dynamic weight. The amplifier’s Class AB biasing contributes to a warm yet articulate sound, making it desirable for both complex orchestral recordings and straightforward rock or jazz playback.
Beyond sound quality, the STA‑150 also stands out for its build quality: heavy steel chassis, neatly laid out internal components, and conservative protection circuitry provide confidence during long listening sessions. German reviewers and audio communities have historically noted that Berendsen gear strikes a balance between “refined detail retrieval” and “analog‑like musical flow,” qualities that are often missing from less ambitious solid‑state designs.
While Berendsen Audio no longer produces amplifiers in significant volume, the STA‑150 persists on the used market as a well‑regarded high‑end power amplifier that can still surprise listeners accustomed to more common brands. Its combination of generous power, smooth musicality, and understated engineering makes it a compelling choice for vintage audiophiles and system builders looking for distinctive, performance‑focused amplification.
Review Quotes
“Extremely well built … allowing the music to be the focal point.” — Berendsen STA‑150 owner review.
“Midrange is clear, open, and liquid… transparently presented with plenty of detail.” — Enthusiast commentary on STA‑150 sound.
“A wonderful listening experience … on par with much more expensive equipment.” — High‑end audio seller listing note.
Product Specifications
Type: Stereo power amplifier
Operation Mode: Class AB solid‑state amplification
Power Output:
150 W per channel into 8 Ω
240 W per channel into 4 Ω
Output Current: >40 A
Linearity: +0.02 dB / –0.08 dB (22 W, 8 Ω)
Total Harmonic Distortion (THD+N): <0.006 % at 100 W, 8 Ω (STA‑150 SE)
Signal‑to‑Noise Ratio: >78 dB
Input Impedance: 47 kΩ
Gain: 29 dB
Input Sensitivity: ~100 mV for 1 W into 8 Ω
Connections: 1 pair RCA inputs; 1 pair speaker binding posts
Power Supply: Toroidal 750 VA transformer
Filter Capacitance: ~60,000 µF
Weight: ~46 lb / 21 kg
Dimensions: ~445 × 390 × 155 mm
Summary:
The Berendsen STA‑150 is an understated but powerful Class AB amplifier with strong engineering roots in Germany. Its generous power delivery, smooth musical character, and high‑quality build make it a notable performance amplifier — especially on the used high‑end market — capable of driving demanding loudspeakers with clarity and authority.