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 TUBE KIT (LESS 4H4c)
NATIONAL HRO-60 TUBE KIT (LESS 4H4c)
Ends in 18 Hours 14 Minutes 7 Seconds
Current price: $99.00 (4 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’B
National HRO-50 HRO-60 Ham Radio Receiver ’B
Ends in 19 Hours 48 Minutes 52 Seconds
Current price: $22.10 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’D
National HRO-50 HRO-60 Ham Radio Receiver ’D
Ends in 19 Hours 48 Minutes 56 Seconds
Current price: $22.10 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’A
National HRO-50 HRO-60 Ham Radio Receiver ’A
Ends in 19 Hours 48 Minutes 58 Seconds
Current price: $22.10 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’A
National HRO-50 HRO-60 Ham Radio Receiver ’A
Ends in 19 Hours 49 Minutes
Current price: $22.10 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’C
National HRO-50 HRO-60 Ham Radio Receiver ’C
Ends in 19 Hours 49 Minutes
Current price: $22.10 (0 bids)
National HRO-50 HRO-60 Ham Radio Receiver ’B
National HRO-50 HRO-60 Ham Radio Receiver ’B
Ends in 19 Hours 49 Minutes 2 Seconds
Current price: $22.10 (0 bids)
NIB tube set for National HRO Sixty receiver
NIB tube set for National HRO Sixty receiver
Ends in 1 Days 15 Hours 48 Minutes 10 Seconds
Current price: $75.00 (0 bids)
National HRO PW Dial, Near Mint See Description, T
National HRO PW Dial, Near Mint See Description, T
Ends in 2 Days 6 Hours 12 Minutes 15 Seconds
Current price: $39.99 (0 bids)
National HRO-500 Instruction Manual -  Premium Car
National HRO-500 Instruction Manual - Premium Car
Ends in 4 Days 7 Hours 20 Minutes 42 Seconds
Current price: $19.95 (2 bids)
National HRO Series HRO-5 manual »R²
National HRO Series HRO-5 manual »R²
Ends in 5 Days 45 Minutes 21 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 5 Days 45 Minutes 24 Seconds
Current price: $14.95 (0 bids)
National HRO-50-1 manual w/23’  foldout sche
National HRO-50-1 manual w/23’ foldout sche
Ends in 5 Days 45 Minutes 26 Seconds
Current price: $15.95 (1 bid)
National HRO-500 manual w/ 30’ schematics »
National HRO-500 manual w/ 30’ schematics »
Ends in 5 Days 45 Minutes 28 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 5 Days 45 Minutes 31 Seconds
Current price: $14.95 (0 bids)
National HRO-7 manual w/ large foldout schematic
National HRO-7 manual w/ large foldout schematic
Ends in 5 Days 45 Minutes 34 Seconds
Current price: $12.95 (0 bids)
Navy RDG Panoramic Receiver Coil Set National HRO
Navy RDG Panoramic Receiver Coil Set National HRO
Ends in 6 Days 8 Hours 30 Minutes 25 Seconds
Current price: $9.99 (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 7 Days 5 Hours 30 Minutes 56 Seconds
Current price: $49.00 (0 bids)
National HRO HF RCAF HF Receiver Complete Setup W/
National HRO HF RCAF HF Receiver Complete Setup W/
Ends in 7 Days 22 Hours 50 Minutes 45 Seconds
Current price: $955.91 (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 3 Hours 8 Minutes 49 Seconds
Current price: $24.95 (0 bids)
1948 NATIONAL HRO-7R RADIO SERVICE MANUAL SCHEMATI
1948 NATIONAL HRO-7R RADIO SERVICE MANUAL SCHEMATI
Ends in 11 Days 15 Hours 55 Minutes 39 Seconds
Current price: $6.98 (0 bids)
Vintage NATIONAL HRO-60 Sixty Tube Shortwave Ham R
Vintage NATIONAL HRO-60 Sixty Tube Shortwave Ham R
Ends in 14 Days 17 Hours 41 Minutes 23 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 18 Days 1 Hours 15 Minutes 7 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 18 Days 5 Hours 31 Minutes 9 Seconds
Current price: $19.99 (1 bid)
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
Ends in 18 Days 5 Hours 31 Minutes 12 Seconds
Current price: $26.99 (4 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 19 Days 19 Hours 58 Minutes 48 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 20 Days 2 Hours 3 Minutes 50 Seconds
Current price: $7.95 (0 bids)
National HRO-50-1 HRO50-1 Radio Receiver Manual
National HRO-50-1 HRO50-1 Radio Receiver Manual
Ends in 23 Days 5 Hours 20 Minutes 10 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 23 Days 15 Hours 2 Minutes 12 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 24 Days 3 Hours 12 Minutes 40 Seconds
Current price: $10.49 (4 bids)
National HRO Reception Set R-106 Receiver Manual
National HRO Reception Set R-106 Receiver Manual
Ends in 24 Days 14 Hours 23 Minutes 56 Seconds
Current price: $7.99 (1 bid)
NATIONAL HRO-50R1, HRO-50T1 SERVICE MANUAL PHOTOFA
NATIONAL HRO-50R1, HRO-50T1 SERVICE MANUAL PHOTOFA
Ends in 24 Days 19 Hours 10 Minutes 33 Seconds
Current price: $5.95 (1 bid)
Manual Reprint For R-106 National HRO Receiver + L
Manual Reprint For R-106 National HRO Receiver + L
Ends in 25 Days 17 Hours 11 Minutes 7 Seconds
Current price: $8.95 (0 bids)
Incredibly Rare National HRO-6 Receiver + Coils A-
Incredibly Rare National HRO-6 Receiver + Coils A-
Ends in 26 Days 7 Hours 10 Minutes 47 Seconds
Current price: $2,750.00 (0 bids)
NATIONAL HRO Communication Receiver Manual
NATIONAL HRO Communication Receiver Manual
Ends in 29 Days 8 Hours 17 Minutes 43 Seconds
Current price: $10.49 (2 bids)
NATIONAL HRO-50 MULTIBAND RADIO RECEIVER PHOTOFACT
NATIONAL HRO-50 MULTIBAND RADIO RECEIVER PHOTOFACT
Ends in 29 Days 21 Hours 52 Minutes 51 Seconds
Current price: $8.50 (0 bids)

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