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History of the manufacturer  

National Radio Institute (NRI); Washington, DC

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Name: National Radio Institute (NRI); Washington, DC    (USA)  
Abbreviation: nri
Products: Model types

Manufacturer of HAM receivers, transmitters, tube tester and other workshop tools. Also TV camera and early computers in kit form.

Founded: 1914
Closed: 2002

From Wikipedia (2014):

The National Radio Institute was founded by James E. Smith, a high school teacher, in Washington, D.C., in 1914.

McGraw-Hill purchased NRI and the correspondence division of Capitol Radio Engineering Institute in 1968. The school was renamed NRI Schools, McGraw-Hill Continuing education center. James E. Smith remained as NRI chairman until his death in 1973. James' son, J Morrison Smith, succeeded as president, retiring in 1976. McGraw-Hill announced in 1999 that it would phase out NRI Schools, citing "changes in the marketplace". They ceased operation on March 31, 2002.

This manufacturer was suggested by Wolfgang Scheida.

Some models:
Country Year Name 1st Tube Notes
USA  49 Professional Tube Tester 70   Eight valve holders, manual test voltage adjustment, neon lamp for short tests, one instru... 
USA  22 Crystal Radio   4,25" tapped coil with two times each four selectable positions, condenser tuning knob in ... 
USA  47 Signal Generator 88 6BE6  Provides 170 kHz to 60 MHz on fundamentals (120 MHz harmonics) in six ranges, attenuato... 
USA  47 Signal Tracer 33 6SK7  Covers 170 kHz to 11,3 MHz in four ranges. Band A: 170 - 490 kHz Band B: 490 - 1470... 
USA  47 Professional Radio Tube Tester 68   Advertised in National Radio News Vol 13 Oct-Nov 1948 No. 5 (Issued by NRI Training hea... 
USA  70 Oscilloscope 2500    
USA  48 Signal Tracer Professional 34 6BA6  This signal tracer has a complete AM 4 band radio circuit incorporated. 
USA  50 Electronic Multitester    
USA  48 Professional Tube Tester 69    
USA  47 Professional Resistor-Condensor Tester 112 6SL7  Capacitance/Resistance & Leakage Tester. Six capacitor ranges: 100pF to 200... 
USA  62 Tube Tester 71   NRI tube tester, 9 tube sockets. 
USA  50 Professional Resistor-Capacitor Tester 311   The RC-tester 311 is equipped with a magic eye as indicator for measurements.