Supreme Instruments RCA Letter April 23, 1932 On April 23, 1932 D.N. Dulweber sent the following letter along with a sales flyer to RCA quoting the discounted cost to RCA for the Supreme AAA-1 Radio Diagnometer. Later in In 1932 the photo below was published inside the front cover of the book "Radio Servicing Course" by Ghirardi and Freed showing an RCA radio repair bench equipped with a Supreme AAA-1 Diagnometer. Supreme later used a "retouched" version of this photo (without the RCA meatball logo) on the cover of their 1933 catalog. A special thank you to Jim at VacuumTubesInc.com for the providing the original letter from his files for this collection. Home Page Supreme History Tube Testers Radio Diagnometers Multimeters Radio Analyzers Advertising Supreme Parts Manuals & Schematics Items Wanted Copyright © 1995-2024 Steve Johnson, Elbridge NY, All rights reserved.