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 Days 20 Hours 6 Minutes 48 Seconds
Current price: $10.49 (1 bid)
NATIONAL HRO-50 MULTIBAND RADIO RECEIVER PHOTOFACT
NATIONAL HRO-50 MULTIBAND RADIO RECEIVER PHOTOFACT
Ends in 3 Days 9 Hours 41 Minutes 56 Seconds
Current price: $8.50 (0 bids)
NATIONAL  HRO-60 TUBE KIT (LESS 4H4c)
NATIONAL HRO-60 TUBE KIT (LESS 4H4c)
Ends in 4 Days 6 Hours 3 Minutes 12 Seconds
Current price: $99.00 (4 bids)
National HRO-60T ’Sixty’ Shortwave Rec
National HRO-60T ’Sixty’ Shortwave Rec
Ends in 4 Days 6 Hours 31 Minutes 36 Seconds
Current price: $699.00 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’B
National HRO-50 HRO-60 Ham Radio Receiver ’B
Ends in 4 Days 7 Hours 37 Minutes 57 Seconds
Current price: $24.70 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’D
National HRO-50 HRO-60 Ham Radio Receiver ’D
Ends in 4 Days 7 Hours 38 Minutes 1 Seconds
Current price: $24.70 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’A
National HRO-50 HRO-60 Ham Radio Receiver ’A
Ends in 4 Days 7 Hours 38 Minutes 3 Seconds
Current price: $24.70 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’C
National HRO-50 HRO-60 Ham Radio Receiver ’C
Ends in 4 Days 7 Hours 38 Minutes 4 Seconds
Current price: $24.70 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’A
National HRO-50 HRO-60 Ham Radio Receiver ’A
Ends in 4 Days 7 Hours 38 Minutes 5 Seconds
Current price: $24.70 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’C
National HRO-50 HRO-60 Ham Radio Receiver ’C
Ends in 4 Days 7 Hours 38 Minutes 5 Seconds
Current price: $24.70 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’B
National HRO-50 HRO-60 Ham Radio Receiver ’B
Ends in 4 Days 7 Hours 38 Minutes 7 Seconds
Current price: $24.70 (0 bids)
NIB tube set for National HRO Sixty receiver
NIB tube set for National HRO Sixty receiver
Ends in 5 Days 3 Hours 29 Minutes 25 Seconds
Current price: $75.00 (0 bids)
National  HRO-5  Late gray  cabinet color,  coils
National HRO-5 Late gray cabinet color, coils
Ends in 7 Days 16 Hours 19 Minutes 54 Seconds
Current price: $225.00 (0 bids)
National HRO-500 Instruction Manual -  Premium Car
National HRO-500 Instruction Manual - Premium Car
Ends in 7 Days 19 Hours 9 Minutes 47 Seconds
Current price: $19.95 (2 bids)
National HRO Series HRO-5 manual »R²
National HRO Series HRO-5 manual »R²
Ends in 8 Days 6 Hours 44 Minutes 54 Seconds
Current price: $12.95 (0 bids)
National HRO-50 manual w/ foldout schematic »R²
National HRO-50 manual w/ foldout schematic »R²
Ends in 8 Days 6 Hours 44 Minutes 57 Seconds
Current price: $14.95 (1 bid)
National HRO-50-1 manual w/23’  foldout sche
National HRO-50-1 manual w/23’ foldout sche
Ends in 8 Days 6 Hours 45 Minutes
Current price: $15.95 (0 bids)
National HRO-500 manual w/ 30’ schematics »
National HRO-500 manual w/ 30’ schematics »
Ends in 8 Days 6 Hours 45 Minutes 3 Seconds
Current price: $19.95 (0 bids)
National HRO-60 manual w/19’ schematic »R²
National HRO-60 manual w/19’ schematic »R²
Ends in 8 Days 6 Hours 45 Minutes 6 Seconds
Current price: $14.95 (1 bid)
National HRO-7 manual w/ large foldout schematic
National HRO-7 manual w/ large foldout schematic
Ends in 8 Days 6 Hours 45 Minutes 10 Seconds
Current price: $12.95 (0 bids)
Nice National HRO Speaker JR SR  etc. 
Nice National HRO Speaker JR SR  etc. 
Ends in 8 Days 17 Hours 47 Minutes 27 Seconds
Current price: $60.00 (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 9 Days 11 Hours 51 Minutes 29 Seconds
Current price: $179.99 (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 10 Days 17 Hours 20 Minutes 1 Seconds
Current price: $49.00 (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 10 Days 18 Hours 20 Minutes 34 Seconds
Current price: $29.99 (0 bids)
National HRO HF RCAF HF Receiver Complete Setup W/
National HRO HF RCAF HF Receiver Complete Setup W/
Ends in 11 Days 10 Hours 39 Minutes 50 Seconds
Current price: $929.09 (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 11 Days 14 Hours 57 Minutes 54 Seconds
Current price: $24.95 (0 bids)
National HRO Radio Receiver w/7.0 - 14,0 Coil / Sh
National HRO Radio Receiver w/7.0 - 14,0 Coil / Sh
Ends in 14 Days 23 Hours 55 Minutes 33 Seconds
Current price: $199.00 (0 bids)
1948 NATIONAL HRO-7R RADIO SERVICE MANUAL SCHEMATI
1948 NATIONAL HRO-7R RADIO SERVICE MANUAL SCHEMATI
Ends in 15 Days 3 Hours 44 Minutes 44 Seconds
Current price: $6.98 (0 bids)
National HRO-500 Instruction Manual - New copy Spi
National HRO-500 Instruction Manual - New copy Spi
Ends in 15 Days 7 Hours 56 Minutes 6 Seconds
Current price: $10.00 (0 bids)
NATIONAL HRO HAM RADIO RECEIVER AND COILS WITH BOX
NATIONAL HRO HAM RADIO RECEIVER AND COILS WITH BOX
Ends in 16 Days 10 Hours 7 Minutes 31 Seconds
Current price: $479.95 (0 bids)
Vintage NATIONAL HRO-60 Sixty Tube Shortwave Ham R
Vintage NATIONAL HRO-60 Sixty Tube Shortwave Ham R
Ends in 18 Days 5 Hours 30 Minutes 28 Seconds
Current price: $42.95 (0 bids)
National HRO-60 Prototype Receiver Coil Storage Sh
National HRO-60 Prototype Receiver Coil Storage Sh
Ends in 21 Days 5 Hours 5 Seconds
Current price: $389.95 (0 bids)
NEW AMPHENOL 4 (FOUR) PIN MALE PLUG FOR NATIONAL H
NEW AMPHENOL 4 (FOUR) PIN MALE PLUG FOR NATIONAL H
Ends in 21 Days 17 Hours 20 Minutes 14 Seconds
Current price: $19.99 (0 bids)
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
Ends in 21 Days 17 Hours 20 Minutes 17 Seconds
Current price: $26.99 (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 23 Days 7 Hours 47 Minutes 53 Seconds
Current price: $49.00 (0 bids)
National HRO-60 Ham Radio User Instruction Manual
National HRO-60 Ham Radio User Instruction Manual
Ends in 23 Days 13 Hours 52 Minutes 55 Seconds
Current price: $9.95 (0 bids)
National HRO-50-1 HRO50-1 Radio Receiver Manual
National HRO-50-1 HRO50-1 Radio Receiver Manual
Ends in 26 Days 17 Hours 9 Minutes 15 Seconds
Current price: $12.99 (3 bids)
National HRO-7 HRO7 Radio Receiver Manual Shortwav
National HRO-7 HRO7 Radio Receiver Manual Shortwav
Ends in 27 Days 2 Hours 51 Minutes 17 Seconds
Current price: $10.49 (5 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 15 Hours 1 Minutes 45 Seconds
Current price: $10.49 (2 bids)
National HRO Reception Set R-106 Receiver Manual
National HRO Reception Set R-106 Receiver Manual
Ends in 28 Days 2 Hours 13 Minutes 1 Seconds
Current price: $7.99 (0 bids)

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