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-60 Signature Series Ham Radio Amateur
National HRO-60 Signature Series Ham Radio Amateur
Ends in 2 Days 21 Hours 15 Minutes 21 Seconds
Current price: $27.00 (1 bid)
CQ Ham Radio Magazine Print Ad NATIONAL HRO-51-1 &
CQ Ham Radio Magazine Print Ad NATIONAL HRO-51-1 &
Ends in 4 Days 16 Hours 32 Minutes 47 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 5 Days 1 Hours 27 Minutes 24 Seconds
Current price: $20.95 (25 bids)
National HRO High Frequency Receiver Coil 14.0 to
National HRO High Frequency Receiver Coil 14.0 to
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Current price: $121.55 (0 bids)
National HRO-7TS Speaker for HRO-7 Ham Radio Recei
National HRO-7TS Speaker for HRO-7 Ham Radio Recei
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Current price: $80.00 (0 bids)
Vintage 1950 NATIONAL HRO-50 Receiver Ham Radio Pr
Vintage 1950 NATIONAL HRO-50 Receiver Ham Radio Pr
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NATIONAL HRO-7R & HRO-7T MULTIBAND RADIO RECEI
NATIONAL HRO-7R & HRO-7T MULTIBAND RADIO RECEI
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Current price: $12.50 (0 bids)
National HRO-60 Prototype Receiver Coil Storage Sh
National HRO-60 Prototype Receiver Coil Storage Sh
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NATIONAL HRO-500 OPERATING INSTRUCTION MANUAL + 11
NATIONAL HRO-500 OPERATING INSTRUCTION MANUAL + 11
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Current price: $22.95 (0 bids)
NATIONAL HRO model  HFS  VHF RECEIVER
NATIONAL HRO model HFS VHF RECEIVER
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National HRO-50 Signature Series Ham Radio Amateur
National HRO-50 Signature Series Ham Radio Amateur
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Current price: $27.00 (4 bids)
NATIONAL  HRO-60 TUBE KIT (LESS 4H4c)
NATIONAL HRO-60 TUBE KIT (LESS 4H4c)
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Current price: $99.00 (14 bids)
National HRO-500 Instruction Manual: 11’X36&
National HRO-500 Instruction Manual: 11’X36&
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Current price: $22.95 (11 bids)
NATIONAL HRO-500 RECEIVER VERY NICE WORKING WITH O
NATIONAL HRO-500 RECEIVER VERY NICE WORKING WITH O
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3 TRANSFORMERS FROM  National HRO-60 “Sixty” R
3 TRANSFORMERS FROM National HRO-60 “Sixty” R
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Current price: $99.00 (0 bids)
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: $22.99 (58 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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Current price: $29.99 (20 bids)
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
Ends in 30 Days 13 Hours 47 Minutes
Current price: $12.99 (6 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
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Current price: $10.49 (9 bids)
National HRO-7 HRO7 Radio Receiver Manual Shortwav
National HRO-7 HRO7 Radio Receiver Manual Shortwav
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Current price: $10.49 (10 bids)
NATIONAL HRO Communication Receiver Manual
NATIONAL HRO Communication Receiver Manual
Ends in 30 Days 13 Hours 49 Minutes 34 Seconds
Current price: $10.49 (4 bids)
 National HRO-50t Ham Radio Receiver  Parts/Repair
National HRO-50t Ham Radio Receiver Parts/Repair
Ends in 30 Days 15 Hours 14 Minutes 43 Seconds
Current price: $312.00 (0 bids)

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