200W Class-AB Mono block power amplifier

The Burson Timekeeper GT4 is a 200W Class-AB, high-current monoblock that brings serious drive and composure to demanding speakers. Its Fusion Core gallium nitride power supply, Silent Power regulator modules, and V7 Vivid Pro opamps work together to deliver clean headroom, low noise, and stable control from the first watt to full output. On your rack or desk, it functions as the focused power engine for a modern two-channel system built around a dedicated DAC or preamp.

High-current power that keeps control

The Timekeeper GT4 runs a deliberately high idling current, drawing about 100 W at rest so its EXICON MOSFET output stage stays in the most linear part of its operating range. Within the first 30 W or so it behaves like a pure Class-A amplifier, then transitions into Class-AB as demand rises. At the speaker terminals you get 100 W into 8 Ω and 200 W into 4 Ω—enough current delivery for real-world speakers that dip in impedance and like to be driven. The result is firm bass, stable imaging, and headroom that makes loud passages feel relaxed instead of strained.

Fusion Core GaN supply for ultra-clean power

Burson’s Fusion Core supply replaces a traditional transformer with a compact switch-mode design built around gallium nitride (GaN) transistors. These devices switch at far higher frequencies than standard silicon MOSFETs, which allows more effective filtering of switching noise and a smoother DC rail. The Fusion Core can deliver up to 480 W of low-noise power with a robust current pump circuit, feeding the amplifier with the kind of stability that translates into tighter bass lines and cleaner transients at your listening position.

Silent Power regulation and black backgrounds

Good power starts at the wall, but it is the regulation that determines how quiet an amplifier feels in use. The Timekeeper GT4 uses Burson Silent Power regulator modules to strip away ripple and reject incoming noise before it can reach the signal path. With a signal to noise ratio of 110 dB and total harmonic distortion under 0.03% at 1 kHz, low-level details stay intact and fade naturally. That matters when you listen late at night at lower volumes and still want space, decay, and subtle room cues from your recordings.

Buffer stage that adapts to your chain

Upstream components do not always share ideal voltage levels or output impedance. To keep your system flexible, the Timekeeper GT4 includes an optional pure Class-A input buffer. Engaging it adds 12 dB of gain on the XLR input and 6 dB on the RCA input, which helps when you use lower-output DACs, minimalist preamps, or even portable sources. With the buffer off, gain returns to unity at the input, letting you pair the GT4 with higher-voltage balanced sources without sacrificing usable volume range on your preamp.

True monoblock architecture for focused imaging

Each Timekeeper GT4 chassis is a single-channel power amplifier. One amp, one channel, one power supply. This layout eliminates cross-channel interaction and allows the left and right channels in a stereo pair to work independently. In practice, you gain a more stable center image and more precise placement of instruments across the soundstage. Whether you run a simple stereo pair or bi-amp a front end, the monoblock format keeps the signal path clean and organized in your listening room.

Burson signal path with V7 opamps and EXICON MOSFETs

Inside the GT4, Burson’s own V7 Vivid Pro discrete opamps handle voltage gain and signal conditioning. They feed a British-made EXICON MOSFET power stage chosen for its linearity and musical texture. The combination is voiced for a balance of transparency and weight rather than a sterile presentation. With output impedance under 0.015 Ω from 20 Hz to 20 kHz, the amplifier maintains strong damping over the driver cones, keeping bass articulate while letting midrange and treble breathe.

Cool Case design with compact footprint

Despite its 100 W idle draw and 200 W output capability, the Timekeeper GT4 avoids large external heatsinks. Burson’s Cool Case design uses the entire chassis as a heat spreader, so the amp runs warm but not unwieldy. At 10.2 x 10.6 x 3 in (255 x 270 x 70 mm) and roughly 11 lbs per monoblock, it fits comfortably on a shelf, in a low rack, or on a sturdy desk beside your preamp or streamer. Give it some breathing room and it will deliver long listening sessions without fuss or noise.

Connectivity that works with modern front ends

The Timekeeper GT4 keeps connections straightforward. You get one single-ended RCA input, one balanced XLR input, and heavy-duty speaker binding posts for your cables. That makes it a clean match for dedicated DACs, streaming preamps, or analog preamps from Burson Audio and other brands. With a 29 dB overall gain structure and clearly defined buffer options, integrating the GT4 as the final power stage in your chain is simple, whether you are building a compact listening desk or a full room rig.

Product highlights

• 200 W Class-AB, high-current monoblock power amplifier
  
• Approximate 30 W pure Class-A region before Class-AB transition
  
• Fusion Core GaN power supply with up to 480 W low-noise output
  
• Silent Power regulator modules for low ripple and high noise rejection
  
• EXICON MOSFET output stage with high current capability
  
• V7 Vivid Pro discrete opamps in the gain stages
  
• Optional pure Class-A input buffer with selectable gain
  
• True monoblock architecture for channel isolation
  
• Cool Case thermal design without external heatsinks
  
• Compact chassis suitable for desk or rack use

Specs

• Model: Burson Timekeeper GT4 monoblock power amplifier
  
• Output power: 100 W @ 8 Ω / 200 W @ 4 Ω
  
• Frequency response: 20 Hz to 20 kHz
  
• THD: <0.03% @ 1 kHz
  
• Signal to noise ratio: 110 dB
  
• Input impedance: 100 kΩ single-ended / 200 kΩ balanced
  
• Overall gain: 29 dB
  
• Input buffer gain (on): 12 dB XLR / 6 dB RCA
  
• Input buffer gain (off): 0 dB XLR / 0 dB RCA
  
• Inputs: 1 x RCA single-ended / 1 x XLR balanced
  
• Outputs: speaker binding posts (+ / -)
  
• Output impedance: <0.015 Ω, 20 Hz to 20 kHz
  
• Standby power: >1 W
  
• Idling power: 100 W
  
• Dimensions: 10.2 x 10.6 x 3 in (255 x 270 x 70 mm)
  
• Weight: 11 lbs (approx. 5 kg)

What’s included

• Standard package:
  • 2 x Timekeeper GT4 monoblock amplifiers with V7 Vivid Pro opamps and Silent Power 02 Modules
    
  • 1 x Burson Super Charger 32 V / 7 A power supply
    
• Max package
  • 2 x Timekeeper GT4 monoblock amplifiers with V7 Vivid Pro opamps and Silent Power 02 Modules
    
  • 2 x Burson Fusion Core 32 V / 15 A power supplies