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!

CINCH JONES P-318-CCT 38331-5618 18 PIN POWER CONN
CINCH JONES P-318-CCT 38331-5618 18 PIN POWER CONN
Ends in 1 Days 20 Hours 45 Minutes 39 Seconds
Current price: $20.95 (13 bids)
NATIONAL HRO 50/50-1 C COIL 3.5-7 MHZ
NATIONAL HRO 50/50-1 C COIL 3.5-7 MHZ
Ends in 2 Days 14 Hours 36 Minutes 14 Seconds
Current price: $12.00 (1 bid)
First Production National HRO Receiver Serial D-72
First Production National HRO Receiver Serial D-72
Ends in 2 Days 16 Hours 15 Minutes 28 Seconds
Current price: $2,200.00 (0 bids)
Vintage Ham Radio NATIONAL HRO Receiver  KNOB no
Vintage Ham Radio NATIONAL HRO Receiver  KNOB no
Ends in 2 Days 18 Hours 19 Minutes 26 Seconds
Current price: $5.99 (1 bid)
National HRO High Frequency Receiver Coil 14.0 to
National HRO High Frequency Receiver Coil 14.0 to
Ends in 3 Days 14 Hours 8 Minutes 1 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 3 Days 14 Hours 10 Minutes 30 Seconds
Current price: $121.55 (0 bids)
NATIONAL HRO 50 TI Shortwave Receiver With Speaker
NATIONAL HRO 50 TI Shortwave Receiver With Speaker
Ends in 3 Days 16 Hours 54 Minutes 19 Seconds
Current price: $349.95 (0 bids)
Sam’s Photofact National HRO-60 1953 Set 202
Sam’s Photofact National HRO-60 1953 Set 202
Ends in 3 Days 22 Hours 49 Minutes 49 Seconds
Current price: $12.95 (0 bids)
NATIONAL HRO-50 MULTIBAND RADIO RECEIVER PHOTOFACT
NATIONAL HRO-50 MULTIBAND RADIO RECEIVER PHOTOFACT
Ends in 7 Days 12 Hours 41 Minutes 51 Seconds
Current price: $8.50 (0 bids)
National HRO-5 s/n X61 Illuminated S-Meter Refurbi
National HRO-5 s/n X61 Illuminated S-Meter Refurbi
Ends in 9 Days 17 Hours 45 Minutes 57 Seconds
Current price: $41.95 (0 bids)
Org PhotoFact Schematic National HRO-50R1 HRO-50T1
Org PhotoFact Schematic National HRO-50R1 HRO-50T1
Ends in 13 Days 8 Hours 26 Minutes 24 Seconds
Current price: $12.95 (0 bids)
NATIONAL HRO 50 TI Shortwave Receiver
NATIONAL HRO 50 TI Shortwave Receiver
Ends in 15 Days 13 Hours 21 Minutes 46 Seconds
Current price: $283.50 (0 bids)
National HRO-60 Prototype Receiver Coil Storage Sh
National HRO-60 Prototype Receiver Coil Storage Sh
Ends in 16 Days 7 Hours 8 Minutes 28 Seconds
Current price: $389.95 (0 bids)
National HRO-500 Receiver
National HRO-500 Receiver
Ends in 18 Days 12 Hours 5 Minutes 45 Seconds
Current price: $1,531.19 (0 bids)
National HRO Series Oriignal Manual Only
National HRO Series Oriignal Manual Only
Ends in 21 Days 10 Hours 46 Minutes 28 Seconds
Current price: $22.68 (0 bids)
NATIONAL HRO model  HFS  VHF RECEIVER
NATIONAL HRO model HFS VHF RECEIVER
Ends in 22 Days 8 Hours 21 Minutes 45 Seconds
Current price: $202.50 (0 bids)
NATIONAL  HRO-60 TUBE KIT (LESS 4H4c)
NATIONAL HRO-60 TUBE KIT (LESS 4H4c)
Ends in 23 Days 9 Hours 3 Minutes 7 Seconds
Current price: $99.00 (9 bids)
National HRO-500 Instruction Manual: 11’X36&
National HRO-500 Instruction Manual: 11’X36&
Ends in 23 Days 22 Hours 9 Minutes 42 Seconds
Current price: $22.95 (7 bids)
National HRO HF RCAF HF Receiver Complete Setup W/
National HRO HF RCAF HF Receiver Complete Setup W/
Ends in 24 Days 13 Hours 39 Minutes 45 Seconds
Current price: $843.83 (0 bids)
Vintage Ham Radio NATIONAL HRO Receiver DIAL &
Vintage Ham Radio NATIONAL HRO Receiver DIAL &
Ends in 25 Days 12 Hours 43 Minutes 23 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 26 Days 20 Hours 20 Minutes 9 Seconds
Current price: $19.99 (27 bids)
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
Ends in 26 Days 20 Hours 20 Minutes 12 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 27 Days 9 Hours 5 Minutes 15 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 27 Days 9 Hours 5 Minutes 15 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 27 Days 9 Hours 7 Minutes 48 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 27 Days 9 Hours 7 Minutes 49 Seconds
Current price: $10.49 (1 bid)
NATIONAL HRO Communication Receiver Manual
NATIONAL HRO Communication Receiver Manual
Ends in 27 Days 9 Hours 7 Minutes 49 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 28 Days 11 Hours 46 Minutes 32 Seconds
Current price: $9.95 (0 bids)

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