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!

General Radio Power Supply for National HRO Receiv
General Radio Power Supply for National HRO Receiv
Ends in 7 Hours 48 Minutes 43 Seconds
Current price: $35.99 (2 bids)
National HRO-50 Ham Radio Receiver S METER
National HRO-50 Ham Radio Receiver S METER
Ends in 9 Hours 45 Minutes 36 Seconds
Current price: $10.50 (3 bids)
NATIONAL HRO Communication Receiver Manual
NATIONAL HRO Communication Receiver Manual
Ends in 11 Hours 17 Minutes 13 Seconds
Current price: $10.49 (2 bids)
NATIONAL HRO-50 MULTIBAND RADIO RECEIVER PHOTOFACT
NATIONAL HRO-50 MULTIBAND RADIO RECEIVER PHOTOFACT
Ends in 1 Days 52 Minutes 21 Seconds
Current price: $8.50 (0 bids)
USA National HRO-500 (HRO500) Receiver case for pa
USA National HRO-500 (HRO500) Receiver case for pa
Ends in 1 Days 17 Hours 14 Minutes 33 Seconds
Current price: $999.00 (0 bids)
NATIONAL  HRO-60 TUBE KIT (LESS 4H4c)
NATIONAL HRO-60 TUBE KIT (LESS 4H4c)
Ends in 1 Days 21 Hours 13 Minutes 37 Seconds
Current price: $99.00 (4 bids)
Vintage Post 1947 National HRO-7T Ham Receiver Tes
Vintage Post 1947 National HRO-7T Ham Receiver Tes
Ends in 2 Days 8 Hours 30 Minutes 12 Seconds
Current price: $200.00 (1 bid)
National HRO-7 A thru D Coils
National HRO-7 A thru D Coils
Ends in 3 Days 19 Minutes 25 Seconds
Current price: $20.00 (1 bid)
National HRO-500 Instruction Manual -  Premium Car
National HRO-500 Instruction Manual - Premium Car
Ends in 5 Days 10 Hours 20 Minutes 12 Seconds
Current price: $19.95 (2 bids)
NATIONAL HRO 50/60 RADIO SPEAKER
NATIONAL HRO 50/60 RADIO SPEAKER
Ends in 6 Days 8 Hours 30 Minutes 28 Seconds
Current price: $60.00 (0 bids)
National HRO ’AA’ Radio Coil Set Gener
National HRO ’AA’ Radio Coil Set Gener
Ends in 7 Days 3 Hours 43 Minutes 49 Seconds
Current price: $44.95 (0 bids)
Plug-in Coil  for National HRO 100-200KC
Plug-in Coil for National HRO 100-200KC
Ends in 9 Days 49 Minutes 21 Seconds
Current price: $30.00 (0 bids)
National HRO HF RCAF HF Receiver Complete Setup W/
National HRO HF RCAF HF Receiver Complete Setup W/
Ends in 9 Days 1 Hours 50 Minutes 15 Seconds
Current price: $982.67 (0 bids)
National HRO-50 Dial Scale for C Band Spread  PN P
National HRO-50 Dial Scale for C Band Spread PN P
Ends in 9 Days 6 Hours 8 Minutes 19 Seconds
Current price: $24.95 (0 bids)
NIB tube set for National HRO Sixty receiver
NIB tube set for National HRO Sixty receiver
Ends in 9 Days 19 Hours 27 Minutes 38 Seconds
Current price: $75.00 (0 bids)
1948 NATIONAL HRO-7R RADIO SERVICE MANUAL SCHEMATI
1948 NATIONAL HRO-7R RADIO SERVICE MANUAL SCHEMATI
Ends in 12 Days 18 Hours 55 Minutes 9 Seconds
Current price: $6.49 (0 bids)
Antique National HRO Receiver with Velvet-AB Power
Antique National HRO Receiver with Velvet-AB Power
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Current price: $350.00 (0 bids)
VINTAGE NATIONAL HRO-500 SOLID STATE COMMUNICATION
VINTAGE NATIONAL HRO-500 SOLID STATE COMMUNICATION
Ends in 13 Days 21 Hours 53 Minutes 17 Seconds
Current price: $999.00 (0 bids)
National HRO RAS-3 Radio Receiver Coil Set #1,2,3
National HRO RAS-3 Radio Receiver Coil Set #1,2,3
Ends in 17 Days 10 Hours 1 Minutes 14 Seconds
Current price: $300.00 (0 bids)
NEW AMPHENOL 4 (FOUR) PIN MALE PLUG FOR NATIONAL H
NEW AMPHENOL 4 (FOUR) PIN MALE PLUG FOR NATIONAL H
Ends in 19 Days 8 Hours 30 Minutes 39 Seconds
Current price: $19.99 (11 bids)
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
Ends in 19 Days 8 Hours 30 Minutes 42 Seconds
Current price: $26.99 (9 bids)
National HRO-60 Ham Radio User Instruction Manual
National HRO-60 Ham Radio User Instruction Manual
Ends in 21 Days 5 Hours 3 Minutes 20 Seconds
Current price: $6.95 (1 bid)
National HRO-500 Hi Manual (photocopy)
National HRO-500 Hi Manual (photocopy)
Ends in 23 Days 3 Hours 51 Minutes 15 Seconds
Current price: $25.00 (0 bids)
National HRO-50-1 HRO50-1 Radio Receiver Manual
National HRO-50-1 HRO50-1 Radio Receiver Manual
Ends in 24 Days 8 Hours 19 Minutes 40 Seconds
Current price: $12.99 (4 bids)
National HRO-7 HRO7 Radio Receiver Manual Shortwav
National HRO-7 HRO7 Radio Receiver Manual Shortwav
Ends in 24 Days 18 Hours 1 Minutes 42 Seconds
Current price: $10.49 (9 bids)
National HRO-60 Prototype Receiver Coil Storage Sh
National HRO-60 Prototype Receiver Coil Storage Sh
Ends in 25 Days 3 Hours 47 Minutes 17 Seconds
Current price: $389.95 (0 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 25 Days 6 Hours 12 Minutes 10 Seconds
Current price: $10.49 (6 bids)
National HRO Reception Set R-106 Receiver Manual
National HRO Reception Set R-106 Receiver Manual
Ends in 25 Days 17 Hours 23 Minutes 26 Seconds
Current price: $7.99 (2 bids)
Manual Reprint For R-106 National HRO Receiver + L
Manual Reprint For R-106 National HRO Receiver + L
Ends in 26 Days 19 Hours 13 Minutes 10 Seconds
Current price: $8.95 (0 bids)
First Production National HRO Receiver Serial D-72
First Production National HRO Receiver Serial D-72
Ends in 28 Days 4 Hours 25 Minutes 58 Seconds
Current price: $2,200.00 (0 bids)
Ham radio coil 4 sets A, AB, C, D,  National HRO G
Ham radio coil 4 sets A, AB, C, D, National HRO G
Ends in 29 Days 2 Hours 31 Minutes 59 Seconds
Current price: $120.00 (0 bids)
National HRO-60TS Desktop Speaker for Vintage NC-1
National HRO-60TS Desktop Speaker for Vintage NC-1
Ends in 29 Days 5 Hours 14 Minutes 30 Seconds
Current price: $113.00 (0 bids)

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