Nelson Pass First Watt F4, Low Watt Masterpiece

Like everything else from First Watt the F4 is a unique amplifier. It has no feedback and no voltage gain, only current gain. This design is sometimes called an “impedance converting amplifier”, but more commonly referred to as a buffer – in this case, a power buffer.

The F4 is Class A impedance converting amplifier, having no voltage gain or feedback. Its input impedance is 47,000 ohms, and its output impedance is about 0.2 ohms. It is suitable for driving a high sensitivity loudspeaker with the output voltage of a preamp or other line-level audio source. It is also useful with a less sensitive loudspeaker in a bi-amped configuration where it takes input from the output of a conventional amplifier.

As a stereo amplifier with single-ended inputs and outputs, it will deliver up to 25 watts into 8 ohms with a damping factor of 40. It will do 50 watts into 4 ohms, and as a mono-block amplifier with parallel inputs and outputs, it will do about 100 watts into 2 ohms. As a mono-block amplifier with balanced inputs and outputs the power output rating is 100 watts into 8 ohms at 1%.

The amplifier operates Class A to 25 watts (50 peak), and the distortion is 2nd and 3rd harmonic in character, rising or declining in proportion to the output power. The amplifier has a direct coupled input and output, with a -0.5 dB rolloff around .1 Hz and 200 KHz. It does a clean square wave at 100 Khz. The combination of a simple Class A circuit operated without feedback and the good objective performance gives us a superb sounding amplifier. The low distortion, bandwidth extension, and high damping results in midrange clarity, treble detail, and control on the bottom end. While these are available from most good solid state amplifiers, the F4 also brings depth, imaging, midrange warmth and top-end sweetness.

Overall, it is one of the best sounding amplifiers, and if you can live with unity voltage gain in your amplifier, it is possibly your best choice. Here's a great full review of this outstanding piece... https://6moons.com/audioreviews/firstwatt6/f4_3.html

So you all know by now that we produce/restore incredible custom Altec Lansing Valencia speaker systems. Well for those of you who have purchased a set of those from us, this is the most unique playing amplifier you will ever try. It's another masterpiece in a long line of Nelson Pass designed products. For speakers with a 90+db sensitivity, and you want to stay on the other side of tubes, this is it! Also know, this is essentially a brand new mint condition F4. Was purchased mistakenly to power something out of its weight class and it took literally 10mins to realize this amp wasn't a fit for this particular customers speakers. I mean, It's BRAND NEW! All the as-new accompaniments - wicked great piece of kit!

Nelson Pass First Watt F4: $1999 plus tax and shipping when applicable.