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-W (HRO-5) Ham Radio Receiver w/697-W
National HRO-W (HRO-5) Ham Radio Receiver w/697-W
Ends in 1 Days 13 Hours 12 Minutes 54 Seconds
Current price: $795.00 (0 bids)
National HRO-500 Instruction Manual -  Premium Car
National HRO-500 Instruction Manual - Premium Car
Ends in 1 Days 20 Hours 26 Minutes 32 Seconds
Current price: $19.95 (2 bids)
NATIONAL HRO 500 RECEIVER!!
NATIONAL HRO 500 RECEIVER!!
Ends in 2 Days 16 Hours 40 Minutes 3 Seconds
Current price: $499.99 (0 bids)
National HRO-60/50 or 183D Receiver NFM-83 (Narrow
National HRO-60/50 or 183D Receiver NFM-83 (Narrow
Ends in 4 Days 8 Hours 16 Minutes 44 Seconds
Current price: $60.00 (1 bid)
National HRO - M  Receiver  ser nr PP-943
National HRO - M  Receiver  ser nr PP-943
Ends in 5 Days 9 Hours 10 Minutes 7 Seconds
Current price: $900.00 (0 bids)
National HRO HF RCAF HF Receiver Complete Setup W/
National HRO HF RCAF HF Receiver Complete Setup W/
Ends in 5 Days 11 Hours 56 Minutes 35 Seconds
Current price: $861.39 (0 bids)
VTG National HRO-50T1 Ham Radio Receiver, Coils, S
VTG National HRO-50T1 Ham Radio Receiver, Coils, S
Ends in 5 Days 13 Hours 7 Minutes 36 Seconds
Current price: $379.99 (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 5 Days 16 Hours 14 Minutes 39 Seconds
Current price: $24.95 (0 bids)
NIB tube set for National HRO Sixty receiver
NIB tube set for National HRO Sixty receiver
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Current price: $75.00 (0 bids)
Vintage National HRO-60
Vintage National HRO-60
Ends in 6 Days 8 Hours 20 Minutes 54 Seconds
Current price: $399.99 (0 bids)
National HRO-50 Series External Speaker Working
National HRO-50 Series External Speaker Working
Ends in 6 Days 18 Hours 36 Minutes 16 Seconds
Current price: $0.33 (0 bids)
Vintage National HRO Sixty  Shortwave Receiver Rad
Vintage National HRO Sixty Shortwave Receiver Rad
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Current price: $400.00 (0 bids)
1948 NATIONAL HRO-7R RADIO SERVICE MANUAL SCHEMATI
1948 NATIONAL HRO-7R RADIO SERVICE MANUAL SCHEMATI
Ends in 9 Days 5 Hours 1 Minutes 29 Seconds
Current price: $6.49 (0 bids)
National HRO 500 Manual with Schematic and other p
National HRO 500 Manual with Schematic and other p
Ends in 12 Days 9 Hours 29 Minutes 23 Seconds
Current price: $19.99 (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 13 Days 20 Hours 7 Minutes 34 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 15 Days 18 Hours 36 Minutes 59 Seconds
Current price: $19.99 (13 bids)
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
Ends in 15 Days 18 Hours 37 Minutes 2 Seconds
Current price: $26.99 (12 bids)
National HRO 60 Radio Reciever Coil Set A
National HRO 60 Radio Reciever Coil Set A
Ends in 16 Days 10 Hours 58 Minutes 39 Seconds
Current price: $79.99 (0 bids)
National HRO 60 Radio Reciever Coil Set A
National HRO 60 Radio Reciever Coil Set A
Ends in 16 Days 11 Hours 1 Minutes 42 Seconds
Current price: $79.99 (0 bids)
National HRO 60 Radio Reciever Coil Set B
National HRO 60 Radio Reciever Coil Set B
Ends in 16 Days 11 Hours 6 Minutes 18 Seconds
Current price: $79.99 (0 bids)
National HRO 60 Radio Reciever Coil Set B
National HRO 60 Radio Reciever Coil Set B
Ends in 16 Days 11 Hours 9 Minutes 55 Seconds
Current price: $79.99 (0 bids)
National HRO 60 Radio Reciever Coil Set C
National HRO 60 Radio Reciever Coil Set C
Ends in 16 Days 11 Hours 13 Minutes 21 Seconds
Current price: $79.99 (0 bids)
National HRO 60 Radio Reciever Coil Set H
National HRO 60 Radio Reciever Coil Set H
Ends in 16 Days 11 Hours 20 Minutes 30 Seconds
Current price: $79.99 (0 bids)
National HRO-60 Ham Radio User Instruction Manual
National HRO-60 Ham Radio User Instruction Manual
Ends in 17 Days 15 Hours 9 Minutes 40 Seconds
Current price: $9.95 (2 bids)
National HRO-500 Hi Manual (photocopy)
National HRO-500 Hi Manual (photocopy)
Ends in 19 Days 13 Hours 57 Minutes 35 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 20 Days 18 Hours 26 Minutes
Current price: $12.99 (5 bids)
National HRO-7 HRO7 Radio Receiver Manual Shortwav
National HRO-7 HRO7 Radio Receiver Manual Shortwav
Ends in 21 Days 4 Hours 8 Minutes 2 Seconds
Current price: $10.49 (11 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 21 Days 16 Hours 18 Minutes 30 Seconds
Current price: $10.49 (6 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 21 Days 17 Hours 7 Minutes 39 Seconds
Current price: $550.00 (0 bids)
National HRO Reception Set R-106 Receiver Manual
National HRO Reception Set R-106 Receiver Manual
Ends in 22 Days 3 Hours 29 Minutes 46 Seconds
Current price: $7.99 (3 bids)
National HRO-60 Prototype Receiver Coil Storage Sh
National HRO-60 Prototype Receiver Coil Storage Sh
Ends in 22 Days 7 Hours 39 Minutes 45 Seconds
Current price: $389.95 (0 bids)
Manual Reprint For R-106 National HRO Receiver + L
Manual Reprint For R-106 National HRO Receiver + L
Ends in 23 Days 5 Hours 19 Minutes 30 Seconds
Current price: $8.95 (0 bids)
National HRO 5TA Receiver with Matching Speaker
National HRO 5TA Receiver with Matching Speaker
Ends in 23 Days 5 Hours 48 Minutes 28 Seconds
Current price: $365.00 (0 bids)
First Production National HRO Receiver Serial D-72
First Production National HRO Receiver Serial D-72
Ends in 24 Days 14 Hours 32 Minutes 18 Seconds
Current price: $2,200.00 (0 bids)
NATIONAL HRO Communication Receiver Manual
NATIONAL HRO Communication Receiver Manual
Ends in 26 Days 21 Hours 23 Minutes 33 Seconds
Current price: $10.49 (4 bids)
NATIONAL HRO-50 MULTIBAND RADIO RECEIVER PHOTOFACT
NATIONAL HRO-50 MULTIBAND RADIO RECEIVER PHOTOFACT
Ends in 27 Days 10 Hours 58 Minutes 41 Seconds
Current price: $8.50 (0 bids)
NATIONAL  HRO-60 TUBE KIT (LESS 4H4c)
NATIONAL HRO-60 TUBE KIT (LESS 4H4c)
Ends in 28 Days 7 Hours 19 Minutes 57 Seconds
Current price: $99.00 (4 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 28 Days 9 Hours 40 Minutes 45 Seconds
Current price: $1,695.00 (0 bids)
NATIONAL HRO 500 RECIVER S# 88 4264
NATIONAL HRO 500 RECIVER S# 88 4264
Ends in 29 Days 10 Hours 59 Minutes 59 Seconds
Current price: $799.00 (0 bids)

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