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Lincoln Green Front (Unknown) Amplifier Test Results

Very heavyweight, very Reggae mono amplifier from Lincoln

Very heavy mono amplifier from Lincoln. With possibly the noisiest fan of any power amplifier I've ever seen, this amp features a massive power transformer and huge power supply smoothing caps, as well as eight speakon sockets at the output. It is mounted in a 5U 19" case.

The amplifier is the standard Hitachi MOSFET application circuit, and features high quality Semelab output devices. Construction quality is not up to the standard of other pro power amplifiers, and looks distinctly home-made. Various internal parts are loose, such as the heatsinks and transformer. Transistors on the amplifier PCB run extremely hot, as does the biasing resistor sitting between the lower VAS and the upper current mirror. These components sit in the 200,000 cfm airflow produced by the 160mm metal-cased axial mains fan, and so should be kept relatively cool.

Waveforms are clean at all impedances and frequencies with no nasties whatsoever at clipping. The amp has huge energy reserves and should be excellent for bass duty at low impedances.



Freq 8R Performance 4R Performance 2R Performance
  Watts THD% Watts THD% Watts THD%
40Hz 5950.1910750.3017640.60
1kHz5570.2110330.5916530.75
10kHz5640.3810200.5816070.56
All results taken with sine wave input into a resistive dummy load of 8, 4 and 2 ohms (where applicable), two channels simultaneously driven (unless otherwise stated), at the threshold of clipping. These results should be considered maximum 'continuous RMS' power ratings (>5 seconds). Distortion measurements, labelled THD%, are taken with an HP8903A audio analyser (80kHz Bandwidth).

Manufacturer Lincoln
Model Green Front (Unknown)
Weight 31 kg
Power to weight Ratio1 33.7 W/kg
Notes Very Heavy Duty MOSFET amplifier, 19/07/2010, Mains did not fall below 241V. Mono amplifier, power measurements are one channel driven. Clean waveforms, and excellent clipping behaviour
Manufacturer's Website -

1 Power to weight ratio is calculated by taking the average of the power measurements at 4 ohms, multiplying by the number of driven amp channels, and then dividing this value by the weight of the amplifier.

Click the images below for full-size versions

Amplifier front panel. Amplifier internals. The main amplifier PCB. It's the Hitachi MOSFET circuit... Output MOSFETs bolted to the main heatsink. Power supply smoothing capacitors and front panel LED driver board. Closeup of power supply capacitors. Amplifier rear panel - note the 8 speakon connectors on a mono amp. 1kHz sine wave at 4R. Clean and perfect. 1kHz sine wave, well into clipping, 4R. Clips nicely, no nasties anywhere. 1kHz sine wave, 8R. Again, perfect.

Description of Images:

  1. Amplifier front panel.
  2. Amplifier internals.
  3. The main amplifier PCB. It's the Hitachi MOSFET circuit...
  4. Output MOSFETs bolted to the main heatsink.
  5. Power supply smoothing capacitors and front panel LED driver board.
  6. Closeup of power supply capacitors.
  7. Amplifier rear panel - note the 8 speakon connectors on a mono amp.
  8. 1kHz sine wave at 4R. Clean and perfect.
  9. 1kHz sine wave, well into clipping, 4R. Clips nicely, no nasties anywhere.
  10. 1kHz sine wave, 8R. Again, perfect.


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