In the 1920's the popular technical magazines (and, for a time, even the mass-market magazines) were full of ads for tools, guides, parts, and components that radio constructors and experimenters needed to make the newest and best radio receivers.

If you like old radio, you will like the e-book reprint of the 1922 Sears, Roebuck Electrical Goods and Radio Apparatus Catalog that Hidden Knowledge has published. Here's a writeup about it, with pictures. It's $2.99, free of DRM, and with all the pages rendered as images you can enlarge to see detail, and even print out. It's $2.99! Follow the link.
  • Adler-Royal Speakers -1925A 2421 visits Adler-Royal Speakers -1925A
  • Airphone Products -1923A 2326 visits Airphone Products -1923A
  • Allen-Bradley Condensers -1925A 1635 visits Allen-Bradley Condensers -1925A
  • Allen-Bradley Controls -1925A 1342 visits Allen-Bradley Controls -1925A
  • Anderson Light Static Machine -1913A 1233 visits Anderson Light Static Machine -1913A
  • Atlas Speakers -1925A 1471 visits Atlas Speakers -1925A
  • Atwater Kent Amplifiers -1922A 1709 visits Atwater Kent Amplifiers -1922A
  • Atwater Kent Loud Speakers -1925A 1548 visits Atwater Kent Loud Speakers -1925A
  • Baldwin-Pacific Radio Kits -1925A 1215 visits Baldwin-Pacific Radio Kits -1925A
  • Barkelew Antenna Switches -1925A 1710 visits Barkelew Antenna Switches -1925A
  • Belden Aerial Wire -1925A 1337 visits Belden Aerial Wire -1925A
  • Brandes Headsets -1925A 1520 visits Brandes Headsets -1925A
  • Bremer-Tully Radio Kits -1925A 2337 visits Bremer-Tully Radio Kits -1925A
  • Briggs & Stratton Headphones -1922A 1663 visits Briggs & Stratton Headphones -1922A
  • Bristol Speakers -1925A 1185 visits Bristol Speakers -1925A
  • Burgess Radio Batteries -1923 1562 visits Burgess Radio Batteries -1923
  • Carborundum Crystal Detectors -1925A 1423 visits Carborundum Crystal Detectors -1925A
  • Cardwell Condensers -1925A 1295 visits Cardwell Condensers -1925A
  • Consrad Radio Design Guides -1925A 1342 visits Consrad Radio Design Guides -1925A
  • Daven Amplifiers -1924A 1355 visits Daven Amplifiers -1924A
  • Dictogrand Loud Speakers -1924A 250 visits Dictogrand Loud Speakers -1924A
  • Dictograph Loudspeakers -1922A 1855 visits Dictograph Loudspeakers -1922A
  • Eastern Low Loss Couplers -1925A 1055 visits Eastern Low Loss Couplers -1925A
  • Effarsee Portable Antennae -1925A 1026 visits Effarsee Portable Antennae -1925A
  • Electro Importing Company -1913A 1645 visits Electro Importing Company -1913A
  • Elgin Radio Kits -1925A 1034 visits Elgin Radio Kits -1925A
  • Erla Radio Kits -1925A 2388 visits Erla Radio Kits -1925A
  • Exide Batteries -1925A 1815 visits Exide Batteries -1925A
  • Experimenters Information Service -1925A 1405 visits Experimenters Information Service -1925A
  • Fada Detectors -1922A 1186 visits Fada Detectors -1922A
  • Federal Radio Products -1922A 1154 visits Federal Radio Products -1922A
  • Freshman Radio Kit -1924A 2040 visits Freshman Radio Kit -1924A
  • Frost Fones -1922A 1631 visits Frost Fones -1922A
  • Frost Fones -1922B 1237 visits Frost Fones -1922B
  • Geraco Radio Accessories -1922A 1199 visits Geraco Radio Accessories -1922A
  • Haller-Cunningham Rotary Spark Gap -1913A 1246 visits Haller-Cunningham Rotary Spark Gap -1913A
  • Hammarlund Condensers -1925A 978 visits Hammarlund Condensers -1925A
  • Heath Company -1949A 1307 visits Heath Company -1949A
  • Heath Company -1949B 1366 visits Heath Company -1949B
  • Heath Condensers -1925A 1219 visits Heath Condensers -1925A
  • Holtzer-Cabot Headphones -1913A 1591 visits Holtzer-Cabot Headphones -1913A
  • Jewett Radio Tuners -1922A 1571 visits Jewett Radio Tuners -1922A
  • L. E. B. Pocket Tool Kit -1913A 2193 visits L. E. B. Pocket Tool Kit -1913A
  • Leiman Bros. Vacuum Pumps -1913A 3086 visits Leiman Bros. Vacuum Pumps -1913A
  • Magnavox Loudspeakers -1923A 890 visits Magnavox Loudspeakers -1923A
  • Manhattan Headsets -1922A 1160 visits Manhattan Headsets -1922A
  • Manhattan Junior Speakers -1925A 1257 visits Manhattan Junior Speakers -1925A
  • Meteor Oscillation Transformers -1917A 859 visits Meteor Oscillation Transformers -1917A
  • Moon Loudspeakers -1922A 1250 visits Moon Loudspeakers -1922A
  • Mozart-Grand Speakers -1925A 1297 visits Mozart-Grand Speakers -1925A
  • Murdock Headphones -1922A 1444 visits Murdock Headphones -1922A
  • New York Coil Company -1922A 1883 visits New York Coil Company -1922A
  • Phenix Radio Ultradyne Kit -1924A 2300 visits Phenix Radio Ultradyne Kit -1924A
  • Proudfoot Condensers -1925A 1166 visits Proudfoot Condensers -1925A
  • Radio Corporation of America -1922A 1525 visits Radio Corporation of America -1922A
  • Radio Shack Ambassador Kit -1925A 1353 visits Radio Shack Ambassador Kit -1925A
  • Reflectone Loud Speaker and Cigarette Box -1925A 1279 visits Reflectone Loud Speaker and Cigarette Box -1925A
  • Sears Ideal Half-KW Transmitting Set -1917A 1356 visits Sears Ideal Half-KW Transmitting Set -1917A
  • Sears University 1 KW Transmitting Set -1917A 1004 visits Sears University 1 KW Transmitting Set -1917A
  • Signal Condensers -1925A 806 visits Signal Condensers -1925A
  • Signal Radio Components -1922A 1085 visits Signal Radio Components -1922A
  • Sleeper Radio -1922A 2073 visits Sleeper Radio -1922A
  • Sleeper Radio Construction Sets -1922A 1301 visits Sleeper Radio Construction Sets -1922A
  • Stromberg-Carlson Loud Speakers -1925A 1312 visits Stromberg-Carlson Loud Speakers -1925A
  • Superadio Low Loss Radio Kit -1925A 1236 visits Superadio Low Loss Radio Kit -1925A
  • Tower Headphones -1925A 1085 visits Tower Headphones -1925A
  • Trimm Speakers -1925A 1390 visits Trimm Speakers -1925A
  • Wallace Valve Detectors -1913A 1607 visits Wallace Valve Detectors -1913A
  • Wireless Specialty Apparatus Co. -1920A 2057 visits Wireless Specialty Apparatus Co. -1920A
  • Wood Cabinet Corporation -1929A 1771 visits Wood Cabinet Corporation -1929A
  • Wood Cabinet Corporation -1929B 2271 visits Wood Cabinet Corporation -1929B