> It sounds like 15-20 watts might do the trick. I need to be able to get 
> enough clean volume; I'm not so worried about the distortion

Silicon Chip did a series on valve amps. If you want I can send
you schematics. I've not built them personally but they did get
very good reviews

Pre-amp

http://www.siliconchip.com.au/cms/A_30804/article.html

20W + 20W stereo

http://www.siliconchip.com.au/cms/A_105000/article.html

How to make an HT supply from an old PC PSU

http://www.siliconchip.com.au/cms/A_102096/article.html

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