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-500 Receiver
National HRO-500 Receiver
Ends in 1 Days 5 Hours 5 Minutes 53 Seconds
Current price: $1,486.78 (0 bids)
National HRO-500 Operating Manual - ORIGINAL - MUS
National HRO-500 Operating Manual - ORIGINAL - MUS
Ends in 1 Days 8 Hours 24 Minutes 54 Seconds
Current price: $79.95 (0 bids)
NATIONAL HRO model  HFS  VHF RECEIVER
NATIONAL HRO model HFS VHF RECEIVER
Ends in 5 Days 1 Hours 21 Minutes 53 Seconds
Current price: $225.00 (0 bids)
1950 NATIONAL HRO-50 SHORTWAVE RADIO SERVICE MANUA
1950 NATIONAL HRO-50 SHORTWAVE RADIO SERVICE MANUA
Ends in 5 Days 3 Hours 10 Seconds
Current price: $9.99 (0 bids)
National HRO-50 Signature Series Ham Radio Amateur
National HRO-50 Signature Series Ham Radio Amateur
Ends in 5 Days 4 Hours 11 Minutes 6 Seconds
Current price: $35.00 (2 bids)
National HRO Receiver Coil 3.5-7.3 MHz RC-105 (2.0
National HRO Receiver Coil 3.5-7.3 MHz RC-105 (2.0
Ends in 5 Days 13 Hours 19 Minutes 44 Seconds
Current price: $19.99 (0 bids)
National HRO-60TS Speaker Ham Radio Receiver
National HRO-60TS Speaker Ham Radio Receiver
Ends in 5 Days 13 Hours 20 Minutes 28 Seconds
Current price: $39.00 (1 bid)
National HRO Receiver Coil 7.0-14.4 MHz RC-105
National HRO Receiver Coil 7.0-14.4 MHz RC-105
Ends in 5 Days 13 Hours 20 Minutes 28 Seconds
Current price: $19.99 (0 bids)
National HRO Receiver Coil 1.7-4.0 MHz (covers 160
National HRO Receiver Coil 1.7-4.0 MHz (covers 160
Ends in 5 Days 13 Hours 20 Minutes 32 Seconds
Current price: $19.99 (0 bids)
NATIONAL  HRO-60 TUBE KIT (LESS 4H4c)
NATIONAL HRO-60 TUBE KIT (LESS 4H4c)
Ends in 6 Days 2 Hours 3 Minutes 15 Seconds
Current price: $99.00 (11 bids)
National HRO-500 Instruction Manual: 11’X36&
National HRO-500 Instruction Manual: 11’X36&
Ends in 6 Days 15 Hours 9 Minutes 50 Seconds
Current price: $22.95 (8 bids)
National HRO HF RCAF HF Receiver Complete Setup W/
National HRO HF RCAF HF Receiver Complete Setup W/
Ends in 7 Days 6 Hours 39 Minutes 53 Seconds
Current price: $819.35 (0 bids)
NEW AMPHENOL 4 (FOUR) PIN MALE PLUG FOR NATIONAL H
NEW AMPHENOL 4 (FOUR) PIN MALE PLUG FOR NATIONAL H
Ends in 9 Days 13 Hours 20 Minutes 17 Seconds
Current price: $19.99 (34 bids)
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
Ends in 9 Days 13 Hours 20 Minutes 20 Seconds
Current price: $26.99 (18 bids)
National HRO Reception Set R-106 Receiver Manual
National HRO Reception Set R-106 Receiver Manual
Ends in 10 Days 2 Hours 5 Minutes 23 Seconds
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 10 Days 2 Hours 5 Minutes 23 Seconds
Current price: $12.99 (4 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 10 Days 2 Hours 7 Minutes 56 Seconds
Current price: $10.49 (7 bids)
National HRO-7 HRO7 Radio Receiver Manual Shortwav
National HRO-7 HRO7 Radio Receiver Manual Shortwav
Ends in 10 Days 2 Hours 7 Minutes 57 Seconds
Current price: $10.49 (6 bids)
NATIONAL HRO Communication Receiver Manual
NATIONAL HRO Communication Receiver Manual
Ends in 10 Days 2 Hours 7 Minutes 57 Seconds
Current price: $10.49 (3 bids)
NATIONAL HRO-60 HRO SIXTY HAM RADIO RECEIVER, SPEA
NATIONAL HRO-60 HRO SIXTY HAM RADIO RECEIVER, SPEA
Ends in 11 Days 3 Hours 28 Minutes 1 Seconds
Current price: $975.00 (0 bids)
Manual Reprint For R-106 National HRO Receiver + L
Manual Reprint For R-106 National HRO Receiver + L
Ends in 11 Days 4 Hours 46 Minutes 40 Seconds
Current price: $9.95 (0 bids)
Set National HRO 500 Module Metal Cover f/ Old Vin
Set National HRO 500 Module Metal Cover f/ Old Vin
Ends in 12 Days 1 Hours 28 Seconds
Current price: $10.00 (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 15 Days 13 Hours 45 Minutes 47 Seconds
Current price: $20.95 (17 bids)
National HRO High Frequency Receiver Coil 14.0 to
National HRO High Frequency Receiver Coil 14.0 to
Ends in 17 Days 7 Hours 8 Minutes 9 Seconds
Current price: $121.55 (0 bids)
National HRO High Frequency Receiver Coil 27.0 to
National HRO High Frequency Receiver Coil 27.0 to
Ends in 17 Days 7 Hours 10 Minutes 38 Seconds
Current price: $121.55 (0 bids)
Sam’s Photofact National HRO-60 1953 Set 202
Sam’s Photofact National HRO-60 1953 Set 202
Ends in 17 Days 15 Hours 49 Minutes 57 Seconds
Current price: $10.36 (0 bids)
National HRO-60 Freq Dial ’Bs’ Scale
National HRO-60 Freq Dial ’Bs’ Scale
Ends in 18 Days 9 Hours 14 Minutes 28 Seconds
Current price: $15.00 (0 bids)
National HRO-60 Freq Dial ’As’ Scale
National HRO-60 Freq Dial ’As’ Scale
Ends in 18 Days 9 Hours 17 Minutes
Current price: $15.00 (0 bids)
Vintage National HRO-50 Concave Frequency Scales (
Vintage National HRO-50 Concave Frequency Scales (
Ends in 18 Days 14 Hours 29 Minutes 5 Seconds
Current price: $29.95 (0 bids)
Vintage National Radio HRO Receiver ’A&rsquo
Vintage National Radio HRO Receiver ’A&rsquo
Ends in 22 Days 4 Hours 31 Minutes 33 Seconds
Current price: $40.00 (0 bids)
National HRO-50R1 (HRO-50) Vintage Ham Radio Recei
National HRO-50R1 (HRO-50) Vintage Ham Radio Recei
Ends in 24 Days 11 Hours 32 Minutes 59 Seconds
Current price: $240.00 (0 bids)
National HRO-60 Prototype Receiver Coil Storage Sh
National HRO-60 Prototype Receiver Coil Storage Sh
Ends in 29 Days 8 Minutes 36 Seconds
Current price: $389.95 (0 bids)

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