DIY All-Tube Phono Preamp Project Part 3, Metal-Working for Dummies By Steve Graham, chief dummy Working with fire and steel? Would you believe alcohol and aluminum? Bonus points to those who can name the 80’s pop group that issued the album shown above. No cheating searching the title online. Before we start torturing some metal: If you are sitting on the fence, wondering whether or not to build one of these for the following reasons: You think this preamp won’t have enough gain because it uses a 6DJ8 for the first stage (a 12AT7 is used for the second stage): Most line stages have plenty of gain so it takes some of the gain burden off of the phono stage. The preamp my audio buddy built is the same configuration we are building here. His has lots of gain even when used with my system which has only moderated line stage gain. You just don’t like tubes in the 6DJ8 family and would prefer to use a tube in the 12A?7 family: I’ll accommodate you, sort of. I’ll describe the option of using 12AT7s for the input tubes. See the supplementary parts list attachment below. For those who would [...]
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