Listed: September 7th, 2023

Pass Labs First Watt F8

Original Retail Price: $4,000.00

Your Price: $3,200.00

Pass Labs First Watt F8. Unit was used only briefly for demo and is in like-new condition. Unit sells for $4,000.00. Perfect companion for high-efficiency speakers and for someone that doesn't want the hassle of tubes.

Originally created almost 6 years ago, the F8 is a stereo two-stage single-ended Class A amplifier using the NOS Toshiba 2SJ74 P channel Jfets and SemiSouth R100 SiC power Jfets for signal gain, plus IRFP240 Mosfet mu-follower current sources, for a total of three devices per channel.

It is similar to the J2 amplifier, but has only one front end transistor instead of six, operated as a current feedback amplifier (CFA) as opposed to the J2's voltage feedback (VFA) differential input. This front end is more consistent with the single-ended approach to amplifier design and yields a purer second harmonic character, less distortion with lower negative feedback, greater bandwidth and higher damping factor.

Nominal specifications: Distortion @ 1 watt, 8 ohms 0.015% Input Impedance 100 Kohm Gain 15 dB Input Sensitivity (1 watt) 0.53 V Input Sensitivity (max output) 2.6 V Damping Factor 40 @ 8 OHMS Output power 8 ohms 25 watts @ 1% THD, 1KHz Output power 4 ohms 15 watts @ 1% THD, 1KHz Frequency response -0.5 dB @ 10 Hz, 200 KHz Noise <100 uV unweighted, 20-20 KHz Power consumption 170 watts Fuse 3AG slow blow type - 2.5 Amp for 120VAC 1.25 Amp for 240 VAC

Original Accessories:

  • Box, Packing, Manual, Accessories