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.

First Watt F5 (Clone) Class A Amplifier. Up for sale is an amazing Class A amplifier and desired by many. I have built this amplifier out of curiosity as I have been told it is absolutely amazing, and it is, but I still prefer my Aleph . It is built as dual-mono, and each channel it is powered by a 200w toroidal transformer and filtered with 66000uf per rail (264000uf for both channels) CRC filter. It has a soft starter with thermal protection, speaker protection (powered by a 3rd transformer), rhodium plated RCA and banana sockets, input and output wires are silver plated OFC . After 3 hours of use, the heatsinks reached 45 Celsius and the power transformer 49.5 Celsius with a room temperature of 21.5 Celsius. There are some extra holes because I used to have the Aleph 3 (spare unit) installed before Collection only please Any questions please feel free to ask

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