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 Radio Receiver Coil JB 7.0 - 14.4 MHz
National HRO Radio Receiver Coil JB 7.0 - 14.4 MHz
Ends in 1 Days 23 Hours 5 Minutes 1 Seconds
Current price: $49.00 (0 bids)
NATIONAL HRO Communication Receiver Manual
NATIONAL HRO Communication Receiver Manual
Ends in 3 Days 15 Hours 30 Minutes 55 Seconds
Current price: $10.49 (0 bids)
NATIONAL  HRO-60 TUBE KIT (LESS 4H4c)
NATIONAL HRO-60 TUBE KIT (LESS 4H4c)
Ends in 5 Days 1 Hours 27 Minutes 19 Seconds
Current price: $99.00 (4 bids)
National HRO-60T ’Sixty’ Shortwave Rec
National HRO-60T ’Sixty’ Shortwave Rec
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Current price: $699.00 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’B
National HRO-50 HRO-60 Ham Radio Receiver ’B
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Current price: $26.00 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’D
National HRO-50 HRO-60 Ham Radio Receiver ’D
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Current price: $26.00 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’A
National HRO-50 HRO-60 Ham Radio Receiver ’A
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Current price: $26.00 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’C
National HRO-50 HRO-60 Ham Radio Receiver ’C
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Current price: $26.00 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’A
National HRO-50 HRO-60 Ham Radio Receiver ’A
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Current price: $26.00 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’C
National HRO-50 HRO-60 Ham Radio Receiver ’C
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Current price: $26.00 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’B
National HRO-50 HRO-60 Ham Radio Receiver ’B
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Current price: $26.00 (0 bids)
General Radio Power Supply for National HRO Receiv
General Radio Power Supply for National HRO Receiv
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Current price: $34.99 (1 bid)
NIB tube set for National HRO Sixty receiver
NIB tube set for National HRO Sixty receiver
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National HRO Series HRO-5 manual »R²
National HRO Series HRO-5 manual »R²
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National HRO-50 manual w/ foldout schematic »R²
National HRO-50 manual w/ foldout schematic »R²
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Current price: $14.95 (0 bids)
National HRO-50-1 manual w/23’  foldout sche
National HRO-50-1 manual w/23’ foldout sche
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National HRO-500 manual w/ 30’ schematics »
National HRO-500 manual w/ 30’ schematics »
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National HRO-60 manual w/19’ schematic »R²
National HRO-60 manual w/19’ schematic »R²
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Current price: $14.95 (0 bids)
National HRO-7 manual w/ large foldout schematic
National HRO-7 manual w/ large foldout schematic
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Current price: $12.95 (0 bids)
National HRO-500 Instruction Manual -  Premium Car
National HRO-500 Instruction Manual - Premium Car
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Current price: $19.95 (2 bids)
Nice National HRO Speaker JR SR W R-115 C MY OTHER
Nice National HRO Speaker JR SR W R-115 C MY OTHER
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Current price: $179.99 (0 bids)
National HRO 60 ’B’ Plug-in Coil 7-14.
National HRO 60 ’B’ Plug-in Coil 7-14.
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Current price: $27.00 (0 bids)
NATIONAL HRO B COIL FOR HRO-60 COVERS 7 MHZ-14 MHZ
NATIONAL HRO B COIL FOR HRO-60 COVERS 7 MHZ-14 MHZ
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Current price: $34.99 (0 bids)
National HRO Senior Radio Receiver w/Power Supply
National HRO Senior Radio Receiver w/Power Supply
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Current price: $499.00 (0 bids)
National HRO Radio Receiver Coil B (7-14.4 MHz) fo
National HRO Radio Receiver Coil B (7-14.4 MHz) fo
Ends in 11 Days 12 Hours 44 Minutes 8 Seconds
Current price: $49.00 (0 bids)
Manual Reprint For R-106 National HRO Receiver + L
Manual Reprint For R-106 National HRO Receiver + L
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Current price: $8.95 (0 bids)
NATIONAL HRO HAM RADIO RECEIVER AND COILS WITH BOX
NATIONAL HRO HAM RADIO RECEIVER AND COILS WITH BOX
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Current price: $549.95 (0 bids)
*COPY* National HRO Series Communications Receiver
*COPY* National HRO Series Communications Receiver
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Current price: $9.99 (0 bids)
National HRO HF RCAF HF Receiver Complete Setup W/
National HRO HF RCAF HF Receiver Complete Setup W/
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National HRO-50 Dial Scale for C Band Spread  PN P
National HRO-50 Dial Scale for C Band Spread PN P
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Current price: $24.95 (0 bids)
National HRO Radio Receiver Coil Set 3.5 Mhz  C MY
National HRO Radio Receiver Coil Set 3.5 Mhz C MY
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Current price: $49.99 (0 bids)
National HRO Radio Receiver Coil Set 14 Mhz  C MY
National HRO Radio Receiver Coil Set 14 Mhz C MY
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Current price: $49.99 (0 bids)
National HRO Radio Receiver Coil Set  Mhz  C MY OT
National HRO Radio Receiver Coil Set Mhz C MY OT
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Current price: $49.99 (0 bids)
National HRO ’B’ receiver coil - 7 and
National HRO ’B’ receiver coil - 7 and
Ends in 15 Days 6 Hours 52 Minutes 8 Seconds
Current price: $40.00 (0 bids)
1948 NATIONAL HRO-7R RADIO SERVICE MANUAL SCHEMATI
1948 NATIONAL HRO-7R RADIO SERVICE MANUAL SCHEMATI
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Current price: $6.98 (0 bids)
National HRO-500 Instruction Manual - New copy Spi
National HRO-500 Instruction Manual - New copy Spi
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Current price: $15.00 (0 bids)
National HRO Radio Receiver Coil JA  14 - 30 Mhz.
National HRO Radio Receiver Coil JA 14 - 30 Mhz.
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Current price: $49.00 (0 bids)
National HRO-60 Prototype Receiver Coil Storage Sh
National HRO-60 Prototype Receiver Coil Storage Sh
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Current price: $350.95 (0 bids)
NATIONAL HRO-60 Shortwave Receiver with coils
NATIONAL HRO-60 Shortwave Receiver with coils
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Current price: $495.00 (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: $19.99 (0 bids)

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