I don't use the firefly for hifi, its intended for guitar amplification, I guess I should update the page to reflect that. The firefly project is a guitar amplifier capable of 1 watt distorted output. This lets you get nice power tube distortion at low levels. I have connected it however to one of the pi's and they are so efficient it can get pretty loud. For a clean low powered tube amp I would recommend something like a 6BM8 tube in single ended class A. You could probably make it as small or smaller than the firefly as the 6BM8 is a dual tube. One section is a high gain triode similar to the 12AT7, the other is a pentode capable of 7 watts dissipation. You could probably get 1-2 watts of nice class a power, maybe more. Is that enough power for hifi? I don't know, but some people swear by their 2a3 amps, hehe..
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