Gianni, my friend and tube pusher, was yesterday travelling with this audio-related load, just bought from a collector... '40s/'50s New Old Stock 211 by Westinghouse, General Electric, RCA...
A truly impressive trunk, indeed...
Plating and Pressing • Re: Question about DMM bath
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Acid Copper is commonly used on the stainless steel substrate so as to
provide the base for the 10 -15 micron copper coating to it,
Conditions and the chem...
6 minutes ago
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