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 High Frequency Receiver Coil 14.0 to
National HRO High Frequency Receiver Coil 14.0 to
Ends in 2 Days 16 Hours 1 Minutes 37 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 2 Days 16 Hours 4 Minutes 6 Seconds
Current price: $121.55 (0 bids)
National HRO 5RA1 Receiver w/ 4 Coils & Power
National HRO 5RA1 Receiver w/ 4 Coils & Power
Ends in 2 Days 16 Hours 17 Minutes 11 Seconds
Current price: $329.00 (0 bids)
National HRO-500 Instruction Manual -  Premium Car
National HRO-500 Instruction Manual - Premium Car
Ends in 3 Days 3 Minutes 18 Seconds
Current price: $20.95 (6 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 4 Days 21 Hours 13 Minutes 40 Seconds
Current price: $79.00 (1 bid)
NATIONAL HRO 50 60 RADIO E & F COIL STORAGE BO
NATIONAL HRO 50 60 RADIO E & F COIL STORAGE BO
Ends in 4 Days 21 Hours 28 Minutes 25 Seconds
Current price: $15.00 (0 bids)
NATIONAL HRO A COIL FOR HRO-60 COVERS 14 MHz TO 30
NATIONAL HRO A COIL FOR HRO-60 COVERS 14 MHz TO 30
Ends in 4 Days 22 Hours 13 Minutes 59 Seconds
Current price: $39.99 (0 bids)
NATIONAL HRO C COIL FOR HRO-60 COVERS 3.5 MHz - 7.
NATIONAL HRO C COIL FOR HRO-60 COVERS 3.5 MHz - 7.
Ends in 4 Days 22 Hours 14 Minutes 4 Seconds
Current price: $39.99 (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 6 Days 10 Hours 50 Minutes 28 Seconds
Current price: $19.99 (0 bids)
National HRO HF RCAF HF Receiver Complete Setup W/
National HRO HF RCAF HF Receiver Complete Setup W/
Ends in 6 Days 15 Hours 33 Minutes 21 Seconds
Current price: $834.77 (0 bids)
National HRO-5 sn X61 Illuminated S-Meter Tested N
National HRO-5 sn X61 Illuminated S-Meter Tested N
Ends in 9 Days 19 Hours 16 Minutes 42 Seconds
Current price: $48.95 (0 bids)
National HRO-7
National HRO-7
Ends in 9 Days 22 Hours 18 Minutes 55 Seconds
Current price: $300.00 (0 bids)
National HRO-5TA 1 with Coil Set Type B
National HRO-5TA 1 with Coil Set Type B
Ends in 9 Days 22 Hours 20 Minutes 53 Seconds
Current price: $290.00 (0 bids)
Vintage Coil Packs for a National HRO Ham Radio Re
Vintage Coil Packs for a National HRO Ham Radio Re
Ends in 12 Days 14 Hours 54 Minutes 57 Seconds
Current price: $199.00 (0 bids)
National HRO-60 Prototype Receiver Coil Storage Sh
National HRO-60 Prototype Receiver Coil Storage Sh
Ends in 13 Days 9 Hours 2 Minutes 4 Seconds
Current price: $389.95 (0 bids)
NATIONAL HRO 50 TI Shortwave Receiver
NATIONAL HRO 50 TI Shortwave Receiver
Ends in 13 Days 15 Hours 15 Minutes 22 Seconds
Current price: $315.00 (0 bids)
National HRO Series Oriignal Manual Only
National HRO Series Oriignal Manual Only
Ends in 16 Days 12 Hours 40 Minutes 4 Seconds
Current price: $22.44 (0 bids)
NEW AMPHENOL 4 (FOUR) PIN MALE PLUG FOR NATIONAL H
NEW AMPHENOL 4 (FOUR) PIN MALE PLUG FOR NATIONAL H
Ends in 16 Days 22 Hours 13 Minutes 45 Seconds
Current price: $19.99 (24 bids)
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
Ends in 16 Days 22 Hours 13 Minutes 48 Seconds
Current price: $26.99 (16 bids)
National HRO Sixty
National HRO Sixty
Ends in 21 Days 19 Hours 40 Minutes 19 Seconds
Current price: $390.00 (0 bids)
National HRO Reception Set R-106 Receiver Manual
National HRO Reception Set R-106 Receiver Manual
Ends in 22 Days 10 Hours 58 Minutes 51 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 22 Days 10 Hours 58 Minutes 51 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 22 Days 11 Hours 1 Minutes 24 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 22 Days 11 Hours 1 Minutes 25 Seconds
Current price: $10.49 (1 bid)
NATIONAL HRO Communication Receiver Manual
NATIONAL HRO Communication Receiver Manual
Ends in 22 Days 11 Hours 1 Minutes 25 Seconds
Current price: $10.49 (1 bid)
Manual Reprint For R-106 National HRO Receiver + L
Manual Reprint For R-106 National HRO Receiver + L
Ends in 24 Days 8 Hours 56 Minutes 16 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 24 Days 20 Hours 37 Minutes 45 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 25 Days 18 Hours 9 Minutes 4 Seconds
Current price: $2,200.00 (0 bids)
NATIONAL HRO-50 MULTIBAND RADIO RECEIVER PHOTOFACT
NATIONAL HRO-50 MULTIBAND RADIO RECEIVER PHOTOFACT
Ends in 28 Days 14 Hours 35 Minutes 27 Seconds
Current price: $8.50 (0 bids)
NATIONAL  HRO-60 TUBE KIT (LESS 4H4c)
NATIONAL HRO-60 TUBE KIT (LESS 4H4c)
Ends in 29 Days 10 Hours 56 Minutes 43 Seconds
Current price: $99.00 (7 bids)

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