Marked: "Type 521 / Two Stage Amplifier / The Colin B. Kennedy Co. / San Francisco / Saint Louis"; on metal tag: "Serial No. L5038W6". A two-stage audio amplifier using two 301-A triodes with a ...

Crystal detector with adjustable cat's whisker, coil slider has 0-10 scale on plate. Terminals for ground, antenna and headphones. Reference: "Clymer-Greenwood" Maker: Howe Auto Products Co., Chicago, ...

Crystal radio receiver with vertical coil, written on bottom: "right ground / left ariel" [sic], and "lower down / ground [wire?] / higher up at / left is / ariel" [sic].

side R: Venetian Quartet. Memoris of Home; side L: Venetian Trio. Dear Heart (Edison 50061). 80 rpm. Side R was recorded in 1912. Side L was recorded in 1914.

Bessie Smith and her Blue Boys. side 1: Trombone Charlie; side 2: Yellow Dog Blues (Parlophone R 2480). 78 rpm. Side 1 was originally recorded in 1927 and released on Columbia 14232-D. Side 2 was ...

Marked: "Crosley / Pup". Bottom plate missing. A regenerative detector using a single UV-201A tube (broken), and a 2 megohm grid-leak resistor affixed to side of frame. Unit has binding posts for ...

See more items in: Western Union Telegraph Company Records, Western Union Telegraph Company Records / Series 19: Public Relations Department Records / 19.13: Posters (British) ...

Little Giant crystal detector receiver in wooden housing with hinged lid. Metropolitan Radio Corporation, Newark, NJ. Crystal cat's whisker type detector with bakelite panel, push-pull tuning handle, ...

Marked: "Radiogem / The Radiogem / Corporation / New York". A kit to make a crystal radio receiver, including original package and instruction manual. Unit is a commercial variety of the old Quaker ...