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First Watt F7 Power Amplifier

First Watt F7 Power Amplifier

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.

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SPECIFICATIONS
Measured at 120 V AV and an 8Ω Load:
 
Distortion
1 Watt 0.5%
Input Impedance
10 Kohm
Gain
14.5 dB
Input Sensitivity (1 watt)
0.53 V
Input Sensitivity (max output)
2.7 V
Damping Factor
>100
Output Power 8Ω
20 Watts @ 2% THD, 1KHz
Output Power 4Ω
30 Watts @ 3%, THD. 1KHz
Class A Envelope
40 Watts Peak @ 4Ω
Frequency Response
DC to -3 dB @ 100 KHz
Noise
100uV unweighted, 20-20 KHz
Power Consumption
170 Watts
Fuse
3AG Slow Blow Type - 
2.5 Amp for 120 VAC
1.25 Amp for 240 VAC

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