National HRO

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The National Radio Company, headquartered in Malden, Massachusetts, USA was incorporated, in 1914, as the "National Toy Company". Their expansion into home appliances led to the name change to the "National Company, Inc." The company moved in to the large scale manufacture of capacitors in the mid 1920s. It was at this time that two engineers, Fred H. Drake and Glen Browning, approached National to manufacture components to their specifications for a radio receiver of their own design. This led to the production and sale of the "National Regenaformer" kit for home construction. The set was capable of tuning the standard AM broadcast band only and could not receive shortwave. By the early 1930s National became well established with the amateur radio community based upon their line of regenerative receivers, including the SW-3 and SW-5.

The top-of-the-line HRO receiver was introduced in 1935. This radio included two RF amplifier stages and a crystal filter. The distinctive dial allowed KC (kHz) resetability and was a National trademark into the 1960s. This same basic design survived for over 20 years.

In 1939, National became a key supplier to the US and Allied governments when war broke out in Europe. The military ordered large numbers of receivers, particularly HRO's. When the United States entered the war some two years later, the word was, "Start building HROs; we'll tell you when to stop." Their number of employees went from approximately 200 to about 2500 during the war.

In the 1950s and 60s, National produced a wide range of amateur radio equipment. In 1965, National introduced the solid state HRO 500, which did not incorporate the famed HRO dial system, but instead featured a direct readout.

Into the 1980s, National survived as a government contractor and ceased development and production of civilian equipment. However, by 1991, amid continuing difficulties, the company ceased operation.

More information on National Radio Company:
Wikipedia reference on National Radio Company

National HRO EBay Bargains!

NATIONAL HRO 50 60 RADIO E & F COIL BAND DIAL
NATIONAL HRO 50 60 RADIO E & F COIL BAND DIAL
Ends in 1 Days 21 Hours 23 Minutes 58 Seconds
Current price: $39.00 (1 bid)
1948 NATIONAL HRO-7R RADIO SERVICE MANUAL SCHEMATI
1948 NATIONAL HRO-7R RADIO SERVICE MANUAL SCHEMATI
Ends in 2 Days 13 Hours 49 Minutes 9 Seconds
Current price: $6.24 (0 bids)
National HRO 5RA1 Receiver w/ 4 Coils & Power
National HRO 5RA1 Receiver w/ 4 Coils & Power
Ends in 3 Days 3 Hours 16 Minutes 46 Seconds
Current price: $299.00 (0 bids)
NATIONAL HRO 50 60 RADIO E & F COIL STORAGE BO
NATIONAL HRO 50 60 RADIO E & F COIL STORAGE BO
Ends in 5 Days 24 Minutes 43 Seconds
Current price: $19.00 (0 bids)
NATIONAL HRO 50 60 RADIO E & F COIL SET 480-96
NATIONAL HRO 50 60 RADIO E & F COIL SET 480-96
Ends in 5 Days 39 Minutes 45 Seconds
Current price: $79.00 (0 bids)
National HRO-60 Prototype Receiver Coil Storage Sh
National HRO-60 Prototype Receiver Coil Storage Sh
Ends in 5 Days 14 Hours 12 Minutes 58 Seconds
Current price: $389.95 (0 bids)
National HRO High Frequency Receiver Coil 27.0 to
National HRO High Frequency Receiver Coil 27.0 to
Ends in 6 Days 22 Hours 4 Minutes 18 Seconds
Current price: $49.99 (0 bids)
National HRO Series Oriignal Manual Only
National HRO Series Oriignal Manual Only
Ends in 8 Days 17 Hours 50 Minutes 58 Seconds
Current price: $23.73 (0 bids)
NEW AMPHENOL 4 (FOUR) PIN MALE PLUG FOR NATIONAL H
NEW AMPHENOL 4 (FOUR) PIN MALE PLUG FOR NATIONAL H
Ends in 9 Days 3 Hours 24 Minutes 39 Seconds
Current price: $19.99 (23 bids)
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
Ends in 9 Days 3 Hours 24 Minutes 42 Seconds
Current price: $26.99 (16 bids)
National HRO Sixty Ham Radio Receiver w/ Matching
National HRO Sixty Ham Radio Receiver w/ Matching
Ends in 10 Days 17 Hours 43 Minutes 36 Seconds
Current price: $1,100.00 (0 bids)
National HRO Reception Set R-106 Receiver Manual
National HRO Reception Set R-106 Receiver Manual
Ends in 14 Days 16 Hours 9 Minutes 45 Seconds
Current price: $7.99 (2 bids)
National HRO-50-1 HRO50-1 Radio Receiver Manual
National HRO-50-1 HRO50-1 Radio Receiver Manual
Ends in 14 Days 16 Hours 9 Minutes 45 Seconds
Current price: $12.99 (2 bids)
National HRO-5 HRO-5T HRO-5R HRO HRO-SR Receiver M
National HRO-5 HRO-5T HRO-5R HRO HRO-SR Receiver M
Ends in 14 Days 16 Hours 12 Minutes 18 Seconds
Current price: $10.49 (5 bids)
National HRO-7 HRO7 Radio Receiver Manual Shortwav
National HRO-7 HRO7 Radio Receiver Manual Shortwav
Ends in 14 Days 16 Hours 12 Minutes 19 Seconds
Current price: $10.49 (1 bid)
NATIONAL HRO Communication Receiver Manual
NATIONAL HRO Communication Receiver Manual
Ends in 14 Days 16 Hours 12 Minutes 19 Seconds
Current price: $10.49 (1 bid)
National HRO-7TS Vintage 8’ Desktop Speaker
National HRO-7TS Vintage 8’ Desktop Speaker
Ends in 15 Days 1 Hours 49 Minutes 13 Seconds
Current price: $120.00 (0 bids)
Manual Reprint For R-106 National HRO Receiver + L
Manual Reprint For R-106 National HRO Receiver + L
Ends in 16 Days 14 Hours 7 Minutes 10 Seconds
Current price: $8.95 (0 bids)
National HRO MX HRO-5 Series of Radio Servicing Ra
National HRO MX HRO-5 Series of Radio Servicing Ra
Ends in 17 Days 1 Hours 48 Minutes 39 Seconds
Current price: $9.99 (0 bids)
First Production National HRO Receiver Serial D-72
First Production National HRO Receiver Serial D-72
Ends in 17 Days 23 Hours 19 Minutes 58 Seconds
Current price: $2,200.00 (0 bids)
NATIONAL HRO-50 MULTIBAND RADIO RECEIVER PHOTOFACT
NATIONAL HRO-50 MULTIBAND RADIO RECEIVER PHOTOFACT
Ends in 20 Days 19 Hours 46 Minutes 21 Seconds
Current price: $8.50 (0 bids)
NATIONAL  HRO-60 TUBE KIT (LESS 4H4c)
NATIONAL HRO-60 TUBE KIT (LESS 4H4c)
Ends in 21 Days 16 Hours 7 Minutes 37 Seconds
Current price: $99.00 (6 bids)
National HRO-W (HRO-5) Ham Radio Receiver w/ 697 P
National HRO-W (HRO-5) Ham Radio Receiver w/ 697 P
Ends in 21 Days 18 Hours 28 Minutes 25 Seconds
Current price: $1,695.00 (0 bids)
National HRO High Frequency Receiver Coil 14.0 to
National HRO High Frequency Receiver Coil 14.0 to
Ends in 24 Days 21 Hours 12 Minutes 31 Seconds
Current price: $121.55 (0 bids)
National HRO High Frequency Receiver Coil 27.0 to
National HRO High Frequency Receiver Coil 27.0 to
Ends in 24 Days 21 Hours 15 Minutes
Current price: $121.55 (0 bids)
National HRO-500 Instruction Manual -  Premium Car
National HRO-500 Instruction Manual - Premium Car
Ends in 25 Days 5 Hours 14 Minutes 12 Seconds
Current price: $20.95 (6 bids)
1952 NATIONAL HRO-50R1 50T1 SHORTWAVE RADIO SERVIC
1952 NATIONAL HRO-50R1 50T1 SHORTWAVE RADIO SERVIC
Ends in 26 Days 17 Hours 22 Minutes 41 Seconds
Current price: $7.99 (0 bids)
National HRO Coil Pack #7 for RAS Tube Radios 14-3
National HRO Coil Pack #7 for RAS Tube Radios 14-3
Ends in 28 Days 16 Hours 1 Minutes 22 Seconds
Current price: $28.99 (0 bids)
National HRO Coil Pack #7 for RAS-5 Tube Radios 14
National HRO Coil Pack #7 for RAS-5 Tube Radios 14
Ends in 28 Days 16 Hours 1 Minutes 22 Seconds
Current price: $28.99 (0 bids)
National HRO HF RCAF HF Receiver Complete Setup W/
National HRO HF RCAF HF Receiver Complete Setup W/
Ends in 28 Days 20 Hours 44 Minutes 15 Seconds
Current price: $882.79 (0 bids)
NATIONAL HRO-50R1 & HRO-50T1 MULTIBAND SHORTWA
NATIONAL HRO-50R1 & HRO-50T1 MULTIBAND SHORTWA
Ends in 29 Days 11 Minutes 42 Seconds
Current price: $9.50 (0 bids)
Complete Set of 7 Coils for National HRO RAS-5 CNA
Complete Set of 7 Coils for National HRO RAS-5 CNA
Ends in 29 Days 39 Minutes 48 Seconds
Current price: $550.00 (0 bids)

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