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!

NEW AMPHENOL 4 (FOUR) PIN MALE PLUG FOR NATIONAL H
NEW AMPHENOL 4 (FOUR) PIN MALE PLUG FOR NATIONAL H
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Current price: $19.99 (37 bids)
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
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National HRO Reception Set R-106 Receiver Manual
National HRO Reception Set R-106 Receiver Manual
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Current price: $7.99 (2 bids)
National HRO-50-1 HRO50-1 Radio Receiver Manual
National HRO-50-1 HRO50-1 Radio Receiver Manual
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National HRO-5 HRO-5T HRO-5R HRO HRO-SR Receiver M
National HRO-5 HRO-5T HRO-5R HRO HRO-SR Receiver M
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National HRO-7 HRO7 Radio Receiver Manual Shortwav
National HRO-7 HRO7 Radio Receiver Manual Shortwav
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NATIONAL HRO Communication Receiver Manual
NATIONAL HRO Communication Receiver Manual
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Current price: $10.49 (4 bids)
 HAM Radio National HRO-5TA with Doghouse 5996 Pow
HAM Radio National HRO-5TA with Doghouse 5996 Pow
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Manual Reprint For R-106 National HRO Receiver + L
Manual Reprint For R-106 National HRO Receiver + L
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CINCH JONES P-318-CCT 38331-5618 18 PIN POWER CONN
CINCH JONES P-318-CCT 38331-5618 18 PIN POWER CONN
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NATIONAL HRO SERIES ORIGINAL MANUAL FOR HRO HRO5 T
NATIONAL HRO SERIES ORIGINAL MANUAL FOR HRO HRO5 T
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National HRO High Frequency Receiver Coil 14.0 to
National HRO High Frequency Receiver Coil 14.0 to
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National HRO-60 Freq Dial ’Bs’ Scale
National HRO-60 Freq Dial ’Bs’ Scale
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National HRO-60 Freq Dial ’As’ Scale
National HRO-60 Freq Dial ’As’ Scale
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Vintage National HRO-50 Concave Frequency Scales (
Vintage National HRO-50 Concave Frequency Scales (
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National HRO-50R1 (HRO-50) Vintage Ham Radio Recei
National HRO-50R1 (HRO-50) Vintage Ham Radio Recei
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NATIONAL HRO-500 OPERATING INSTRUCTION MANUAL + 2
NATIONAL HRO-500 OPERATING INSTRUCTION MANUAL + 2
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National HRO-60 Prototype Receiver Coil Storage Sh
National HRO-60 Prototype Receiver Coil Storage Sh
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NATIONAL HRO model  HFS  VHF RECEIVER
NATIONAL HRO model HFS VHF RECEIVER
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1950 NATIONAL HRO-50 SHORTWAVE RADIO SERVICE MANUA
1950 NATIONAL HRO-50 SHORTWAVE RADIO SERVICE MANUA
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National HRO-50 Signature Series Ham Radio Amateur
National HRO-50 Signature Series Ham Radio Amateur
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National HRO-60TS Speaker
National HRO-60TS Speaker
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NATIONAL  HRO-60 TUBE KIT (LESS 4H4c)
NATIONAL HRO-60 TUBE KIT (LESS 4H4c)
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National HRO-500 Instruction Manual: 11’X36&
National HRO-500 Instruction Manual: 11’X36&
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Current price: $22.95 (8 bids)
National HRO HF RCAF HF Receiver Complete Setup W/
National HRO HF RCAF HF Receiver Complete Setup W/
Ends in 30 Days 7 Hours 17 Minutes 27 Seconds
Current price: $833.93 (0 bids)

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