The Barnes Family

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A new amplifier

F4 (4).jpgI’ve been away from the world of hi-fi and DIY for a long time. Before I went back to school I started building a power amplifier designed by Nelson Pass, but I never finished it. Until now.

I feel as though I finally have my commute worked out, and the work routine under control more or less, and so I pulled out the bits a couple of weekends ago and got it all finished off.

F4 (1).jpgMetalwork (the enclosure and heatsinks) are always the hardest part. In this case I used a mix of plywood and redwood strips, combined with a cheap extrusion and a couple of surplus heatsinks (originally one piece: cut in half on the table saw).

It came together pretty quickly. Self-tapping screws to hold the transistors down, and wood screws or machine screws for much of the rest. The amplifier draws a lot of current, and I was pretty nervous turning it on, but with some great advice from online, and a lightbulb as a current limiter, it all worked out fine.

The sound is great. It’s super-clear, and a pleasure to rediscover a lot of music. It’s also completely quiet: no audible hum or noise at all. If you want to learn more, Nelson provides information on another of his websites: www.firstwatt.com.

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2 comments

2 Comments so far

  1. tim October 13th, 2011 6:14 am

    I took the amp and its supporting preamp to Burning Amp the other weekend: lots of fun, good food and music.
    tim recently posted..A new amplifierMy Profile

  2. tim October 13th, 2011 6:15 am

    Now I’m building a new preamp: the BA-3 by Nelson Pass: it’s the third thing he’s designed for the diyaudio / Burning Amp community. It’s all done except I’m waiting for the output transistors to arrive…
    tim recently posted..A new amplifierMy Profile

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