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 Freq Dial ’Bs’ Scale
National HRO-60 Freq Dial ’Bs’ Scale
Ends in 20 Hours 53 Minutes 47 Seconds
Current price: $15.00 (0 bids)
National HRO-60 Freq Dial ’As’ Scale
National HRO-60 Freq Dial ’As’ Scale
Ends in 20 Hours 56 Minutes 19 Seconds
Current price: $15.00 (0 bids)
Vintage National HRO-50 Concave Frequency Scales (
Vintage National HRO-50 Concave Frequency Scales (
Ends in 1 Days 2 Hours 8 Minutes 24 Seconds
Current price: $19.95 (0 bids)
NATIONAL HRO model  HFS  VHF RECEIVER
NATIONAL HRO model HFS VHF RECEIVER
Ends in 2 Days 18 Hours 16 Minutes 16 Seconds
Current price: $30.00 (0 bids)
National hro 50  NFM-50  narrowband fm adapter,
National hro 50  NFM-50  narrowband fm adapter,
Ends in 3 Days 18 Hours 53 Minutes 17 Seconds
Current price: $15.00 (1 bid)
National HRO-60 Radio Parts Lot
National HRO-60 Radio Parts Lot
Ends in 5 Days 1 Hours 6 Minutes 40 Seconds
Current price: $20.00 (0 bids)
National HRO-60 Tubes & Parts Lot
National HRO-60 Tubes & Parts Lot
Ends in 5 Days 1 Hours 9 Minutes 20 Seconds
Current price: $20.00 (0 bids)
National HRO-60 Parts Lot
National HRO-60 Parts Lot
Ends in 5 Days 1 Hours 11 Minutes 13 Seconds
Current price: $20.00 (1 bid)
National HRO-60 S-Meter~Dial & Coil Strip Part
National HRO-60 S-Meter~Dial & Coil Strip Part
Ends in 5 Days 1 Hours 13 Minutes 21 Seconds
Current price: $20.00 (1 bid)
National HRO-60 BPO & Can Parts Lot
National HRO-60 BPO & Can Parts Lot
Ends in 5 Days 1 Hours 19 Minutes 21 Seconds
Current price: $20.00 (1 bid)
Vintage National HRO Ham Radio F Coil 480-960 kc P
Vintage National HRO Ham Radio F Coil 480-960 kc P
Ends in 5 Days 21 Hours 2 Minutes 1 Seconds
Current price: $31.00 (2 bids)
Vintage National HRO Ham Radio C Coil 3.5, 7.0 -7.
Vintage National HRO Ham Radio C Coil 3.5, 7.0 -7.
Ends in 5 Days 21 Hours 7 Minutes 24 Seconds
Current price: $30.00 (0 bids)
Vintage National HRO Ham Radio E Coil 900 - 2050 K
Vintage National HRO Ham Radio E Coil 900 - 2050 K
Ends in 5 Days 21 Hours 12 Minutes 9 Seconds
Current price: $30.00 (1 bid)
Vintage National HRO Ham Radio D Coil 1.7, 3.5 - 4
Vintage National HRO Ham Radio D Coil 1.7, 3.5 - 4
Ends in 5 Days 21 Hours 15 Minutes 33 Seconds
Current price: $30.00 (0 bids)
Vintage National HRO Ham Radio B Coil 7.0, 14.0 -
Vintage National HRO Ham Radio B Coil 7.0, 14.0 -
Ends in 5 Days 21 Hours 19 Minutes 30 Seconds
Current price: $30.00 (0 bids)
Vintage National HRO Ham Radio J Coil 50 - 100 Kc.
Vintage National HRO Ham Radio J Coil 50 - 100 Kc.
Ends in 5 Days 21 Hours 22 Minutes 53 Seconds
Current price: $30.00 (1 bid)
Vintage National HRO Ham Radio H Coil 100 - 200 Kc
Vintage National HRO Ham Radio H Coil 100 - 200 Kc
Ends in 5 Days 21 Hours 26 Minutes 22 Seconds
Current price: $30.00 (1 bid)
Vintage National HRO Ham Radio G Coil 180 - 430 Kc
Vintage National HRO Ham Radio G Coil 180 - 430 Kc
Ends in 5 Days 21 Hours 29 Minutes 11 Seconds
Current price: $30.00 (0 bids)
NATIONAL HRO-7R & HRO-7T MULTIBAND RADIO RECEI
NATIONAL HRO-7R & HRO-7T MULTIBAND RADIO RECEI
Ends in 11 Days 18 Hours 29 Minutes 11 Seconds
Current price: $12.50 (0 bids)
National HRO-60 Prototype Receiver Coil Storage Sh
National HRO-60 Prototype Receiver Coil Storage Sh
Ends in 12 Days 11 Hours 47 Minutes 55 Seconds
Current price: $389.95 (0 bids)
NATIONAL HRO-50R1 & HRO-50T1 MULTIBAND RADIO R
NATIONAL HRO-50R1 & HRO-50T1 MULTIBAND RADIO R
Ends in 12 Days 12 Hours 49 Minutes 39 Seconds
Current price: $12.50 (0 bids)
NATIONAL HRO-500 OPERATING INSTRUCTION MANUAL + 2
NATIONAL HRO-500 OPERATING INSTRUCTION MANUAL + 2
Ends in 12 Days 23 Hours 23 Minutes 48 Seconds
Current price: $22.95 (0 bids)
Classic NATIONAL HRO-7 with PRODUCT DETECTOR + 4 C
Classic NATIONAL HRO-7 with PRODUCT DETECTOR + 4 C
Ends in 15 Days 22 Hours 20 Minutes 26 Seconds
Current price: $500.00 (0 bids)
NATIONAL HRO model  HFS  VHF RECEIVER
NATIONAL HRO model HFS VHF RECEIVER
Ends in 18 Days 13 Hours 1 Minutes 12 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 18 Days 14 Hours 39 Minutes 29 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 18 Days 15 Hours 50 Minutes 25 Seconds
Current price: $35.00 (3 bids)
NATIONAL  HRO-60 TUBE KIT (LESS 4H4c)
NATIONAL HRO-60 TUBE KIT (LESS 4H4c)
Ends in 19 Days 13 Hours 42 Minutes 34 Seconds
Current price: $99.00 (11 bids)
National HRO-500 Instruction Manual: 11’X36&
National HRO-500 Instruction Manual: 11’X36&
Ends in 20 Days 2 Hours 49 Minutes 9 Seconds
Current price: $22.95 (9 bids)
Original Sams Photofact Folder National HRO-60 Rec
Original Sams Photofact Folder National HRO-60 Rec
Ends in 21 Days 17 Hours 45 Minutes 3 Seconds
Current price: $10.36 (0 bids)
NEW AMPHENOL 4 (FOUR) PIN MALE PLUG FOR NATIONAL H
NEW AMPHENOL 4 (FOUR) PIN MALE PLUG FOR NATIONAL H
Ends in 23 Days 59 Minutes 36 Seconds
Current price: $19.99 (41 bids)
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
NEW AMPHENOL 4 (FOUR) PIN PLUG SET FOR NATIONAL HR
Ends in 23 Days 59 Minutes 39 Seconds
Current price: $26.99 (19 bids)
National HRO Reception Set R-106 Receiver Manual
National HRO Reception Set R-106 Receiver Manual
Ends in 23 Days 13 Hours 44 Minutes 42 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 23 Days 13 Hours 44 Minutes 42 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 23 Days 13 Hours 47 Minutes 15 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 23 Days 13 Hours 47 Minutes 16 Seconds
Current price: $10.49 (7 bids)
NATIONAL HRO Communication Receiver Manual
NATIONAL HRO Communication Receiver Manual
Ends in 23 Days 13 Hours 47 Minutes 16 Seconds
Current price: $10.49 (4 bids)
 HAM Radio National HRO-5TA with Doghouse 5996 Pow
HAM Radio National HRO-5TA with Doghouse 5996 Pow
Ends in 23 Days 16 Hours 13 Minutes 26 Seconds
Current price: $539.99 (0 bids)
Manual Reprint For R-106 National HRO Receiver + L
Manual Reprint For R-106 National HRO Receiver + L
Ends in 24 Days 16 Hours 25 Minutes 59 Seconds
Current price: $9.95 (0 bids)
National HRO-60 Signature Series Ham Radio Amateur
National HRO-60 Signature Series Ham Radio Amateur
Ends in 26 Days 21 Hours 13 Minutes 3 Seconds
Current price: $35.00 (1 bid)
CINCH JONES P-318-CCT 38331-5618 18 PIN POWER CONN
CINCH JONES P-318-CCT 38331-5618 18 PIN POWER CONN
Ends in 29 Days 1 Hours 25 Minutes 6 Seconds
Current price: $20.95 (23 bids)

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