This is a Nelson Pass designed First Watt model F5 that I built. 25 watts per channel class A. Two Hammond 1182G18 power transformers at 225 VA each for a total of 450 VA. These transformers retail for $89 each. All Vishay precision resistors. Massive heat sinks. I used a high quality circuit board widely available here on eBay. (see pic) No hum. Dead quiet. Power supply filter board is the one recommended for First Watt builds. You will find that this amp is evenly balanced across the frequency spectrum unlike cheap solid state amps that tend to have bass and highs but all the midrange is sucked out. Being a class A amp it runs HOT. THIS IS NORMAL. The heat sinks get up to about 50 degrees C which is how it should run. You can buy a new First Watt amp for about $4,000. Heres an opportunity to see what all the fuss is about for a lot less. Power cord included. On Sep-01-23 at 18:51:04 PDT, seller added the following information: I also have for sale here on eBay a Pass designed ACA amp which is a great platform for building any of the First Watt amplifiers.

One pair of F5 TURBO V2 amplifier boards. Fully operational and packed with expensive, hard to find, components. Most all components are matched to their complements or counterparts. This is not a Pass Labs product, it is a DIY kit based around schematics provided by Nelson Pass. This listing is for the completed board pair. Power supply and ancillary components will need to be purchased separately. Additional: These boards also have the added cascoding circuity that protects the input Jfets from high rail voltages. This addition allows the user to increase rail voltages beyond those shown in schematics and increase the amplifier power output.

Nelson Pass First Watt F5 Power Amplifier.. 2nd owner, comes in good condition.