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Brumby's Projects
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Crystal Sets
Mystery Crystal Set
Steampunk
Galvanic Etching
Valve projects
1S5 3S4 Audio Amplifier
One Valve Battery Superhet
Two Valve Battery Superhet
Grid leak detector and amp
Brumby's Projects
Galvanic Etching
An old technique for etching brass.
(More to come when I have free time.)
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