GRAAFiti 5050: Power Amplifier

GRAAFiti 5050 Power Amplifier

The GRAAFiti 5050 is our interpretation of a classic push-pull valve circuit. But we don’t consider the 5050 to be "vintage", because our interpretation of the circuit utilises components and valves, such as the 6922, not used before in the audio field.

High output power and small physical dimensions characterise the GRAAFiti 5050. The circuit is typically push-pull, operating in Class AB mode.

The power stage uses the new KT88A valves, which we find particularly efficient and suitable for difficult loads. The output transformers are hand-made by skilled artisans using the finest available materials, exclusively for GRAAF.

Inside the GRAAFiti 5050 is a novel bias control, an automatic circuit which allows the amplifier to achieve low distortion levels.

Great stability is assured even during AC line variations, and changing the power tubes is simply a matter of plug and play.

In the voltage gain stage, the 5050 uses two 6922 double triodes, selected for their linearity and excellent signal-to-noise ratio.

Specifications:

Power output :	50 W + 50 W RMS
Output impedance:	4 ÷ 8 ohms
Input sensitivity:	1,4 V
Input impedance:	100 Kohms
Total harmonic distortion:	0,28% (a 1 W)
Signal/Noise ratio:	105 dB A
Frequency response:	7 Hz to 40 KHz (-3 dB a 1 W)
Negative feedback:	6 dB
Power requirements:	105 ÷ 120 / 210 ÷ 240 V (50 ÷ 60 Hz) at rest 300 W
Dimensions (W x H x D):	410 x 195 x 330 mm
Weight:	25 Kg

GRAAFiti components are assembled with the same care and with the same calibre of components used for all GRAAF products.

GRAAF: For the Passionate Listener

Via Venturi, 66/68 - 41100 Modena Italy