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For sale is a rare vintage BA-71A Preamplifier Germanium Transistor microphone preamplifier module. The model sticker tag reads: RCA Preamplifier Type BA-71A MI-11658 Radio Corporation of America Camden N.J. Made in U.S.A. We have three available (M1119 / M1092 / M1251), all including their original boxes (incredibly rare, guessing these are closer to NOS condition than used). Listed price is for a single BA-71A. The pictured unit is representative of the one you may receive but the actual one you purchase may arrive slightly different than the exact one shown. They are all in comparable condition to the one pictured. These all came from a broadcast radio station collection. They are untested, no warranties, guarantees, refunds or returns, as/is for parts/repairs. We can test/service them for additional cost as well as build a custom rack with power supply for them for additional cost, contact us if interested. We have additional photos available of all the modules, contact us if you need to see additional photos.