First Watt F7 by Nelson Pass

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  • $4,500.00
  • Regular price $7,895.00

First Watt F7 by Nelson Pass

Condition: Ex Display

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.

Comes with box

Nominal specifications:

Measured at 120 V AC and an 8 ohm load:

Distortion @ 1 watt 0.05%

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 8 ohms 20 watts @ 2% THD, 1KHz

Output power 4 ohms 30 watts @ 3% THD, 1KHz

Class A envelope 40 watts peak @ 4 ohms

Frequency response DC to -3 dB @ 100 KHz

Noise100 uV unweighted, 20-20 KHz

Power consumption 170 watts

Fuse3AG slow blow type -

2.5 Amp for 120VAC

1.25 Amp for 240 VAC