Microphone preamplifier owned by Bo Diddley

Source catalog description

This description refers to material held by Smithsonian National Museum of African American History and Culture. Visual details below describe the original material.

An Ampex 351 microphone preamplifier with a white and black label reading: [4]. The preamp features a small meter at center behind a glass front along with various black dials and metal switches. An Ampex manufacturer’s tag on the back reads: [AMPEX / CAT. NO. 02-30960-11 / SCHEM. 84-0070 / CONT. NO. 29723 / PROTECTED BY U. S. AND FOREIGN PATENTS].

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