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This is the service manual for the First Watt F1 power amplifier. There were only 101 amplifiers built of this design and made available for sale. As none have broken in the field yet, this document is most likely to appeal immediately to the audio DIY enthusiasts, and is so structured. The F1 is a two channel transconductance power amplifier, which is a fancy name for an active current source. A given input voltage results in a particular output current. Ordinary amplifiers are voltage amplifiers – an input voltage translates into an output voltage. This is not that kind of amplifier, and as of this writing, the F1 is the only such amplifier available for audio use. This is a very unusual amplifier that will not sound good with about 98% of the loudspeakers on the market. It requires careful attention to loudspeaker loading to get the best performance. The accompanying white paper “Current Source Amplifiers and Full-Range High-Efficiency Drivers” is required reading. This is a tinkerer’s amplifier, and experimental tool. If you just want to be a consumer, then buy something else, otherwise be prepared to patiently experiment with your system to get the best
performance. The amplifier requires about 1/2 hour of operation to reach normal operating temperature, and this warm-up time is appropriate for the most critical listening, but is not otherwise an issue, as the performance difference between 5 minutes and 60 minutes is very marginal. I do not personally see a reason to run the amplifier all the time.
Tags:voltage amplifiers, diy enthusiasts, audio diy, power amplifier, experimental tool
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