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 HF RCAF HF Receiver Complete Setup W/
National HRO HF RCAF HF Receiver Complete Setup W/
Ends in 10 Hours 3 Minutes 16 Seconds
Current price: $785.14 (0 bids)
NATIONAL HRO-7R & HRO-7T MULTIBAND RADIO RECEI
NATIONAL HRO-7R & HRO-7T MULTIBAND RADIO RECEI
Ends in 13 Hours 48 Minutes 4 Seconds
Current price: $12.50 (0 bids)
Vintage Ham Radio NATIONAL HRO Receiver DIAL &
Vintage Ham Radio NATIONAL HRO Receiver DIAL &
Ends in 1 Days 9 Hours 6 Minutes 54 Seconds
Current price: $39.95 (0 bids)
NEW AMPHENOL 4 (FOUR) PIN MALE PLUG FOR NATIONAL H
NEW AMPHENOL 4 (FOUR) PIN MALE PLUG FOR NATIONAL H
Ends in 2 Days 16 Hours 43 Minutes 40 Seconds
Current price: $19.99 (30 bids)
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
Ends in 2 Days 16 Hours 43 Minutes 43 Seconds
Current price: $26.99 (18 bids)
National HRO Reception Set R-106 Receiver Manual
National HRO Reception Set R-106 Receiver Manual
Ends in 3 Days 5 Hours 28 Minutes 46 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 3 Days 5 Hours 28 Minutes 46 Seconds
Current price: $12.99 (3 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 3 Days 5 Hours 31 Minutes 19 Seconds
Current price: $10.49 (6 bids)
National HRO-7 HRO7 Radio Receiver Manual Shortwav
National HRO-7 HRO7 Radio Receiver Manual Shortwav
Ends in 3 Days 5 Hours 31 Minutes 20 Seconds
Current price: $10.49 (2 bids)
NATIONAL HRO Communication Receiver Manual
NATIONAL HRO Communication Receiver Manual
Ends in 3 Days 5 Hours 31 Minutes 20 Seconds
Current price: $10.49 (3 bids)
Manual Reprint For R-106 National HRO Receiver + L
Manual Reprint For R-106 National HRO Receiver + L
Ends in 4 Days 8 Hours 10 Minutes 3 Seconds
Current price: $9.95 (0 bids)
CINCH JONES P-318-CCT 38331-5618 18 PIN POWER CONN
CINCH JONES P-318-CCT 38331-5618 18 PIN POWER CONN
Ends in 8 Days 17 Hours 9 Minutes 10 Seconds
Current price: $20.95 (15 bids)
National HRO High Frequency Receiver Coil 14.0 to
National HRO High Frequency Receiver Coil 14.0 to
Ends in 10 Days 10 Hours 31 Minutes 32 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 10 Days 10 Hours 34 Minutes 1 Seconds
Current price: $121.55 (0 bids)
Sam’s Photofact National HRO-60 1953 Set 202
Sam’s Photofact National HRO-60 1953 Set 202
Ends in 10 Days 19 Hours 13 Minutes 20 Seconds
Current price: $10.36 (0 bids)
1952 NATIONAL HRO-50R1 50T1 SHORTWAVE RADIO SERVIC
1952 NATIONAL HRO-50R1 50T1 SHORTWAVE RADIO SERVIC
Ends in 12 Days 8 Hours 19 Minutes 55 Seconds
Current price: $9.99 (0 bids)
NATIONAL HRO-50 MULTIBAND RADIO RECEIVER PHOTOFACT
NATIONAL HRO-50 MULTIBAND RADIO RECEIVER PHOTOFACT
Ends in 14 Days 9 Hours 5 Minutes 22 Seconds
Current price: $8.50 (0 bids)
NATIONAL HRO SIXTY ham/shortwave receiver !!!!!!
NATIONAL HRO SIXTY ham/shortwave receiver !!!!!!
Ends in 16 Days 14 Hours 17 Minutes 11 Seconds
Current price: $400.00 (0 bids)
Org PhotoFact Schematic National HRO-50R1 HRO-50T1
Org PhotoFact Schematic National HRO-50R1 HRO-50T1
Ends in 20 Days 4 Hours 49 Minutes 55 Seconds
Current price: $8.29 (0 bids)
NATIONAL HRO 50 TI Shortwave Receiver
NATIONAL HRO 50 TI Shortwave Receiver
Ends in 22 Days 9 Hours 45 Minutes 17 Seconds
Current price: $315.00 (0 bids)
National HRO-60 Prototype Receiver Coil Storage Sh
National HRO-60 Prototype Receiver Coil Storage Sh
Ends in 23 Days 3 Hours 31 Minutes 59 Seconds
Current price: $389.95 (0 bids)
National HRO-500 Receiver
National HRO-500 Receiver
Ends in 25 Days 8 Hours 29 Minutes 16 Seconds
Current price: $1,424.70 (0 bids)
National HRO Series Oriignal Manual Only
National HRO Series Oriignal Manual Only
Ends in 28 Days 7 Hours 9 Minutes 59 Seconds
Current price: $21.11 (0 bids)
NATIONAL HRO model  HFS  VHF RECEIVER
NATIONAL HRO model HFS VHF RECEIVER
Ends in 29 Days 4 Hours 45 Minutes 16 Seconds
Current price: $225.00 (0 bids)
NATIONAL  HRO-60 TUBE KIT (LESS 4H4c)
NATIONAL HRO-60 TUBE KIT (LESS 4H4c)
Ends in 30 Days 5 Hours 26 Minutes 38 Seconds
Current price: $99.00 (9 bids)
National HRO-500 Instruction Manual: 11’X36&
National HRO-500 Instruction Manual: 11’X36&
Ends in 30 Days 18 Hours 33 Minutes 13 Seconds
Current price: $22.95 (7 bids)

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