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 2280 visits Adler-Royal Speakers -1925A
  • Airphone Products -1923A 2237 visits Airphone Products -1923A
  • Allen-Bradley Condensers -1925A 1574 visits Allen-Bradley Condensers -1925A
  • Allen-Bradley Controls -1925A 1159 visits Allen-Bradley Controls -1925A
  • Anderson Light Static Machine -1913A 1146 visits Anderson Light Static Machine -1913A
  • Atlas Speakers -1925A 1388 visits Atlas Speakers -1925A
  • Atwater Kent Amplifiers -1922A 1605 visits Atwater Kent Amplifiers -1922A
  • Atwater Kent Loud Speakers -1925A 1443 visits Atwater Kent Loud Speakers -1925A
  • Baldwin-Pacific Radio Kits -1925A 1101 visits Baldwin-Pacific Radio Kits -1925A
  • Barkelew Antenna Switches -1925A 1635 visits Barkelew Antenna Switches -1925A
  • Belden Aerial Wire -1925A 1237 visits Belden Aerial Wire -1925A
  • Brandes Headsets -1925A 1410 visits Brandes Headsets -1925A
  • Bremer-Tully Radio Kits -1925A 2252 visits Bremer-Tully Radio Kits -1925A
  • Briggs & Stratton Headphones -1922A 1554 visits Briggs & Stratton Headphones -1922A
  • Bristol Speakers -1925A 1116 visits Bristol Speakers -1925A
  • Burgess Radio Batteries -1923 1446 visits Burgess Radio Batteries -1923
  • Carborundum Crystal Detectors -1925A 1370 visits Carborundum Crystal Detectors -1925A
  • Cardwell Condensers -1925A 1199 visits Cardwell Condensers -1925A
  • Consrad Radio Design Guides -1925A 1269 visits Consrad Radio Design Guides -1925A
  • Daven Amplifiers -1924A 1288 visits Daven Amplifiers -1924A
  • Dictogrand Loud Speakers -1924A 115 visits Dictogrand Loud Speakers -1924A
  • Dictograph Loudspeakers -1922A 1765 visits Dictograph Loudspeakers -1922A
  • Eastern Low Loss Couplers -1925A 963 visits Eastern Low Loss Couplers -1925A
  • Effarsee Portable Antennae -1925A 931 visits Effarsee Portable Antennae -1925A
  • Electro Importing Company -1913A 1490 visits Electro Importing Company -1913A
  • Elgin Radio Kits -1925A 940 visits Elgin Radio Kits -1925A
  • Erla Radio Kits -1925A 2312 visits Erla Radio Kits -1925A
  • Exide Batteries -1925A 1689 visits Exide Batteries -1925A
  • Experimenters Information Service -1925A 1343 visits Experimenters Information Service -1925A
  • Fada Detectors -1922A 1038 visits Fada Detectors -1922A
  • Federal Radio Products -1922A 1056 visits Federal Radio Products -1922A
  • Freshman Radio Kit -1924A 1933 visits Freshman Radio Kit -1924A
  • Frost Fones -1922A 1544 visits Frost Fones -1922A
  • Frost Fones -1922B 1167 visits Frost Fones -1922B
  • Geraco Radio Accessories -1922A 1090 visits Geraco Radio Accessories -1922A
  • Haller-Cunningham Rotary Spark Gap -1913A 1169 visits Haller-Cunningham Rotary Spark Gap -1913A
  • Hammarlund Condensers -1925A 916 visits Hammarlund Condensers -1925A
  • Heath Company -1949A 1212 visits Heath Company -1949A
  • Heath Company -1949B 1270 visits Heath Company -1949B
  • Heath Condensers -1925A 1166 visits Heath Condensers -1925A
  • Holtzer-Cabot Headphones -1913A 1517 visits Holtzer-Cabot Headphones -1913A
  • Jewett Radio Tuners -1922A 1453 visits Jewett Radio Tuners -1922A
  • L. E. B. Pocket Tool Kit -1913A 2072 visits L. E. B. Pocket Tool Kit -1913A
  • Leiman Bros. Vacuum Pumps -1913A 2933 visits Leiman Bros. Vacuum Pumps -1913A
  • Magnavox Loudspeakers -1923A 777 visits Magnavox Loudspeakers -1923A
  • Manhattan Headsets -1922A 1081 visits Manhattan Headsets -1922A
  • Manhattan Junior Speakers -1925A 1156 visits Manhattan Junior Speakers -1925A
  • Meteor Oscillation Transformers -1917A 776 visits Meteor Oscillation Transformers -1917A
  • Moon Loudspeakers -1922A 1139 visits Moon Loudspeakers -1922A
  • Mozart-Grand Speakers -1925A 1202 visits Mozart-Grand Speakers -1925A
  • Murdock Headphones -1922A 1298 visits Murdock Headphones -1922A
  • New York Coil Company -1922A 1797 visits New York Coil Company -1922A
  • Phenix Radio Ultradyne Kit -1924A 2228 visits Phenix Radio Ultradyne Kit -1924A
  • Proudfoot Condensers -1925A 1102 visits Proudfoot Condensers -1925A
  • Radio Corporation of America -1922A 1450 visits Radio Corporation of America -1922A
  • Radio Shack Ambassador Kit -1925A 1293 visits Radio Shack Ambassador Kit -1925A
  • Reflectone Loud Speaker and Cigarette Box -1925A 1174 visits Reflectone Loud Speaker and Cigarette Box -1925A
  • Sears Ideal Half-KW Transmitting Set -1917A 1271 visits Sears Ideal Half-KW Transmitting Set -1917A
  • Sears University 1 KW Transmitting Set -1917A 923 visits Sears University 1 KW Transmitting Set -1917A
  • Signal Condensers -1925A 758 visits Signal Condensers -1925A
  • Signal Radio Components -1922A 956 visits Signal Radio Components -1922A
  • Sleeper Radio -1922A 2003 visits Sleeper Radio -1922A
  • Sleeper Radio Construction Sets -1922A 1177 visits Sleeper Radio Construction Sets -1922A
  • Stromberg-Carlson Loud Speakers -1925A 1191 visits Stromberg-Carlson Loud Speakers -1925A
  • Superadio Low Loss Radio Kit -1925A 1173 visits Superadio Low Loss Radio Kit -1925A
  • Tower Headphones -1925A 976 visits Tower Headphones -1925A
  • Trimm Speakers -1925A 1318 visits Trimm Speakers -1925A
  • Wallace Valve Detectors -1913A 1522 visits Wallace Valve Detectors -1913A
  • Wireless Specialty Apparatus Co. -1920A 1935 visits Wireless Specialty Apparatus Co. -1920A
  • Wood Cabinet Corporation -1929A 1652 visits Wood Cabinet Corporation -1929A
  • Wood Cabinet Corporation -1929B 2174 visits Wood Cabinet Corporation -1929B