too many to name, though maybe someone else has a favorite. I think it depends on what you want to do. TP's suggestion is best. There is a lot of good info, and resources. This can be a real adventure.
If you want to build a kit, Audionote, Bottlehead and Decware come to mind. I built the Decware kit (low power @ 2 watts or so). If you want to build from scratch, go to diyaudioprojects dot com
I can build from scratch but I'd like a proven design, with schematic, to work from. A kit would be better .. better chance at success on 1st project. I've done other electronic projects before but this would be my first foray into tubes. I looked into the diyaudioprojects web site and was overwhelmed with all the projects.
Thx for the tips guys. Lots of research to do on my part I guess. It's always good to hear success stories from other kit builders.
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