The F7 is a very unique power amplifier, a two-stage push-pull JFET/MOSFET topology with fewer parts than any First Watt amplifier to date and incorporating a very interesting balance of very low negative voltage feedback and a little bit of positive current feedback to give an astonishing measure of control over reactive loudspeaker loads.
Output Specifications | |
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Output power | 20Wpc into 8 ohms (1% THD at 1kHz); 30Wpc into 4 ohms (2% THD at 1kHz) |
Frequency response | –3dB at 100kHz |
Total harmonic distortion (THD) | 0.05% (1W) |
Damping factor | 100 |
Class A envelope | 50W peak at 4 ohms |
Input Specifications | |
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Input impedance | 10k ohms |
Gain | 14dB |
Input sensitivity | 0.57V (1W); 2.53V (max output) |
Noise Specifications | |
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Noise | 100µV unweighted, 20Hz–20kHz |
General Specifications | |
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Dimensions | 17″ x 5.5″ x 15″ |
Weight | 26 lbs. |