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 Communication Receiver Manual
NATIONAL HRO Communication Receiver Manual
Ends in 2 Hours 18 Minutes 7 Seconds
Current price: $10.49 (0 bids)
National HRO-60T ’Sixty’ Ham Radio Com
National HRO-60T ’Sixty’ Ham Radio Com
Ends in 22 Hours 59 Minutes 51 Seconds
Current price: $250.00 (0 bids)
NATIONAL  HRO-60 TUBE KIT (LESS 4H4c)
NATIONAL HRO-60 TUBE KIT (LESS 4H4c)
Ends in 1 Days 12 Hours 14 Minutes 31 Seconds
Current price: $99.00 (4 bids)
NATIONAL HRO-500 GENERAL COVERAGE SOLID STATE RECE
NATIONAL HRO-500 GENERAL COVERAGE SOLID STATE RECE
Ends in 1 Days 12 Hours 41 Minutes 57 Seconds
Current price: $500.00 (0 bids)
National HRO-60T ’Sixty’ Shortwave Rec
National HRO-60T ’Sixty’ Shortwave Rec
Ends in 1 Days 12 Hours 42 Minutes 55 Seconds
Current price: $699.00 (0 bids)
NIB tube set for National HRO Sixty receiver
NIB tube set for National HRO Sixty receiver
Ends in 1 Days 21 Hours 54 Minutes 57 Seconds
Current price: $75.00 (0 bids)
National HRO Model 50T Communication Receiver SN/2
National HRO Model 50T Communication Receiver SN/2
Ends in 2 Days 23 Hours 31 Minutes 11 Seconds
Current price: $299.00 (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
Ends in 3 Days 23 Hours 32 Minutes 33 Seconds
Current price: $39.99 (0 bids)
National HRO-500 Instruction Manual -  Premium Car
National HRO-500 Instruction Manual - Premium Car
Ends in 5 Days 1 Hours 21 Minutes 6 Seconds
Current price: $19.95 (2 bids)
Nice National HRO S-Meter Works!
Nice National HRO S-Meter Works!
Ends in 5 Days 22 Hours 54 Minutes 17 Seconds
Current price: $19.99 (0 bids)
National HRO 60-T Sixty HAM Radio Receiver Powers
National HRO 60-T Sixty HAM Radio Receiver Powers
Ends in 6 Days 37 Minutes 7 Seconds
Current price: $100.00 (0 bids)
National HRO ’Sixty’ Model 60T Communi
National HRO ’Sixty’ Model 60T Communi
Ends in 6 Days 6 Hours 44 Minutes 23 Seconds
Current price: $299.00 (0 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
Ends in 6 Days 18 Hours 2 Minutes 48 Seconds
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: $45.00 (0 bids)
National HRO-50 / HRO-60 Ham Radio Receiver &rsquo
National HRO-50 / HRO-60 Ham Radio Receiver &rsquo
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Current price: $25.00 (1 bid)
National HRO Senior Radio Receiver w/Power Supply
National HRO Senior Radio Receiver w/Power Supply
Ends in 7 Days 13 Hours 37 Minutes 6 Seconds
Current price: $499.00 (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: $699.95 (0 bids)
National HRO Radio Receiver Coil Set D / E / F wit
National HRO Radio Receiver Coil Set D / E / F wit
Ends in 7 Days 23 Hours 30 Minutes 59 Seconds
Current price: $249.00 (0 bids)
National HRO Radio Receiver Coil C (3.5 - 7.3 MHz)
National HRO Radio Receiver Coil C (3.5 - 7.3 MHz)
Ends in 7 Days 23 Hours 31 Minutes 11 Seconds
Current price: $49.00 (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 7 Days 23 Hours 31 Minutes 20 Seconds
Current price: $49.00 (0 bids)
National HRO Radio Receiver Coil A (14-30 MHz) for
National HRO Radio Receiver Coil A (14-30 MHz) for
Ends in 7 Days 23 Hours 31 Minutes 28 Seconds
Current price: $49.00 (0 bids)
*COPY* National HRO Series Communications Receiver
*COPY* National HRO Series Communications Receiver
Ends in 8 Days 13 Hours 32 Minutes 17 Seconds
Current price: $9.99 (0 bids)
National HRO HF RCAF HF Receiver Complete Setup W/
National HRO HF RCAF HF Receiver Complete Setup W/
Ends in 8 Days 16 Hours 51 Minutes 9 Seconds
Current price: $1,009.70 (0 bids)
National HRO-50 Dial Scale for C Band Spread  PN P
National HRO-50 Dial Scale for C Band Spread PN P
Ends in 8 Days 21 Hours 9 Minutes 13 Seconds
Current price: $24.95 (0 bids)
Manual Reprint For R-106 National HRO Receiver + L
Manual Reprint For R-106 National HRO Receiver + L
Ends in 8 Days 22 Hours 17 Minutes 46 Seconds
Current price: $8.95 (0 bids)
National HRO Radio Receiver Coil Set 3.5 Mhz  C MY
National HRO Radio Receiver Coil Set 3.5 Mhz C MY
Ends in 8 Days 22 Hours 56 Minutes 11 Seconds
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
Ends in 8 Days 22 Hours 58 Minutes 1 Seconds
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
Ends in 8 Days 23 Hours 1 Minutes 19 Seconds
Current price: $49.99 (0 bids)
National HRO 50 60 Ham Radio Receiver Dial Scale H
National HRO 50 60 Ham Radio Receiver Dial Scale H
Ends in 9 Days 22 Hours 3 Minutes 5 Seconds
Current price: $150.00 (0 bids)
1948 NATIONAL HRO-7R RADIO SERVICE MANUAL SCHEMATI
1948 NATIONAL HRO-7R RADIO SERVICE MANUAL SCHEMATI
Ends in 12 Days 9 Hours 56 Minutes 3 Seconds
Current price: $7.91 (0 bids)
National HRO Radio Receiver Coil JA  14 - 30 Mhz.
National HRO Radio Receiver Coil JA 14 - 30 Mhz.
Ends in 13 Days 7 Hours 45 Minutes 59 Seconds
Current price: $49.00 (0 bids)
National HRO Radio Receiver 3 Coil Set w/Case 4.0
National HRO Radio Receiver 3 Coil Set w/Case 4.0
Ends in 13 Days 7 Hours 55 Minutes 27 Seconds
Current price: $149.00 (0 bids)
National HRO-60 Prototype Receiver Coil Storage Sh
National HRO-60 Prototype Receiver Coil Storage Sh
Ends in 17 Days 21 Hours 58 Minutes 1 Seconds
Current price: $389.95 (0 bids)
National HRO-7 Radio Receiver Coil B  7 - 14.4 Mhz
National HRO-7 Radio Receiver Coil B 7 - 14.4 Mhz
Ends in 20 Days 13 Hours 59 Minutes 12 Seconds
Current price: $49.00 (0 bids)
National HRO-60 Radio Receiver Coil G / .18 - .43
National HRO-60 Radio Receiver Coil G / .18 - .43
Ends in 20 Days 14 Hours 19 Minutes 46 Seconds
Current price: $99.00 (0 bids)
National HRO-60 Ham Radio User Instruction Manual
National HRO-60 Ham Radio User Instruction Manual
Ends in 20 Days 20 Hours 4 Minutes 14 Seconds
Current price: $19.95 (0 bids)
National HRO-50 / HRO-60 ’DS’ Dial Sca
National HRO-50 / HRO-60 ’DS’ Dial Sca
Ends in 21 Days 1 Hours 8 Minutes 8 Seconds
Current price: $22.50 (1 bid)
National HRO-50 / HRO-60 ’AS’ Dial Sca
National HRO-50 / HRO-60 ’AS’ Dial Sca
Ends in 21 Days 1 Hours 8 Minutes 18 Seconds
Current price: $22.50 (0 bids)
National HRO-50 / HRO-60 ’BS’ Dial Sca
National HRO-50 / HRO-60 ’BS’ Dial Sca
Ends in 21 Days 1 Hours 8 Minutes 21 Seconds
Current price: $22.50 (0 bids)
National HRO-50 / HRO-60 Ham Radio Receiver &rsquo
National HRO-50 / HRO-60 Ham Radio Receiver &rsquo
Ends in 21 Days 21 Hours 52 Minutes 10 Seconds
Current price: $22.50 (1 bid)

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