Preamplifier A remarkable combination of exceptional performance, flexibility and value
The GFP-555's musical performance is outstanding - by any measurement or listening criterion. For example,… one of the most satisfying preamps around in terms of overall tonal balance. You can go back to it after a few weeks and still feel it to be basically right; it reveals most associated equipment as more colored than itself.
At the same time, the GFP-555 is surprisingly affordable.
Superb construction, incorporating regulated power supplies with large filter capacitors, provides superior performance no matter how widely the musical signal or AC line voltage may fluctuate.
As for flexibility, you can listen to any source while taping from another. There's an unusual number of inputs and outputs, plus adjustable phono gain and capacitance.
Outstanding performance
The GFP-555's musical performance is outstanding - by any measurement or listening criterion - and at the same time it offers a full array of meaningful controls and features.
What's more, the GFP-555 does it all at a surprisingly affordable price. Surprising, that is, only to those who aren't yet familiar with the Adcom approach to design and performance Musical performance, in particular.
Gai path - simple and direct
The GFP-555's gain path is simple and direct from input to output. The use of a minimum number of components - each of the highest quality - means low waveform distortion and less phase shift
The gain stages employ the most innovative state-of-the-art. Linear amplifiers ever used in high fidelity components. These individually selected instrument-grade devices are in a class by themselves.
The speed of the gain stages is almost fifty times faster than CD or LP signals. And the noise and distortion measurements are incredibly low. Direct coupling makes possible a frequency response from below 1 Hz to beyond 400,000 Hz
Specifications
Total Harmonic Distortion: 0,005%
Intermodulation Distortion: 0,005%
Signal-to-Noise Ratio
Phono : better than 85 dB (re 0,5 V output)
Tuner, CD, Tape : better than 100 dB (re 2 V output)
Tone Controls
Bass : ±9 dB at 40 Hz
Treble : ±9,5 dB at 15 kHz
Contour: =6 dB at 50 Hz
Frequency Response: 1 Hz - 100 kHz ±0,1 dB
High Filter: -2,5 dB at 20 kHz (6 dB/octave)
Low Filter : -5 dB at 20 Hz (6 dB/octave)
Input Sensitivity for 0,5 V output
Phono High MC/MM : 0,4 mV
Phono Low MMC : 0,13 mV
High : 40 mV
Maximum Output Level : 10 volts
Input Impedance
High MC'/MM : 47 Ω
Low MC : 100 Ω
Output Impednce: 470 Ω
Phono Overload (at 1 kHz High MC/MM): 140 mV
Phono Input Capacitance: 10 pF, 175 pF, 275 pF (adjustable)
Line Voltage: 120 V 60 Hz (available in 230 V /50 Hz)
Dimensions (W x H x D): 432 x 83 x 324 mm (17" x 3-1/4" x 12-3/4")
Weight: 6,4 kg (14 lbs)
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