Hammarlund SP-600

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The Hammarlund Manufacturing Company was founded by Oscar Hammarlund in New York City in 1910. The first Hammarlund plant manufactured radio components and was located on Fulton Street in lower Manhattan.. Their variable capacitor designs quickly became industry standards, and the company adopted the capacitorís schematic symbol as its logo. Hammarlund formed a partnership called Hammarlund-Roberts Co. in the mid 1920íspecifically to offer kits for AM Broadcast radios using Hammarlund parts.

Hammarlund-Roberts went out of business in 1931 and the Hammarlund Mfg. Co., Inc. introduced of the "Comet Pro", the first commercial shortwave superheterodyne receiver. Within five years, thousands of these receivers were in use at commercial radiotelegraph and radiotelephone stations, aboard ships and by amateur radio operators the world over.

After the Comet-Pro came an improved receiver, called the Super-Pro (the SP-200 series in 1936. Hammarlund expanded with the onset of World War II, with more than 2000 people employed at 14 different plants. It has been estimated that almost 90% of American wartime military electronic equipment employed Hammarlund capacitors. At the end of World War II, surplus Super-Pro receivers at bargain prices were readily available, which may be a reason why so many of these are still survive today.

In 1947, the SP-600 Super-Pro receiver, which surpassed the SP-200 in performance, was introduced. It covered 540 kHz to 54 mHz with a 0-100 calibrated mechanical band spreadand had provisions for optional crystal control of six selected frequencies. Also produced, was a VLF version, which tuned from 10 kHz to 540 kHz. The SP-600 receiver series was popular throughout the world for military, laboratory and commercial uses.

While Hammarlund was most famous for its amateur/short-wave receiver lines such as the Super Pro series and the HQ series (which includes the HQ-100, 110, 120, 129, 145, 150, 160, 170, 180, 200 and 215) it also produced a number of amateur transmitters. In 1960 the HX-500, a 100 watt, table-top, single-sideband transmitter was introduced.This rig also had FM and FSK transmission capability, along with the later HX-50. The HXL-1 was a compact linear amplifier introduced in 1964.

The company changed ownership often. In the late 1950s Hammarlund was sold to Telechrome. Then Telechrome sold out to Giannini Scientific. In the late 60ís the company was sold to the Electronic Assistance Corporation (EAC). The product line was either sold off in parts or phased out. The Cardwell Condenser Corporation purchased all remaining components, and in the early 1970s the Hammarlund factory closed. At the time of its demise, Hammarlund was among the very oldest producers of radio equipment in the United States.

More information on Hammarlund:
Wikipedia reference on Hammarlund
Ham Radio Museum - Hammarlund

Hammarlund SP-600 EBay Bargains!

Four Manual Set  Hammarlund SP-600 Series Radios
Four Manual Set Hammarlund SP-600 Series Radios
Ends in 14 Hours 17 Minutes 49 Seconds
Current price: $21.95 (0 bids)
Three Manual Set  Hammarlund SP-600 Series Radios
Three Manual Set Hammarlund SP-600 Series Radios
Ends in 1 Days 12 Hours 13 Minutes 57 Seconds
Current price: $14.95 (2 bids)
Hammarlund SP-600 TwinAx Ant Plug UG-102 (PL-284),
Hammarlund SP-600 TwinAx Ant Plug UG-102 (PL-284),
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Current price: $23.99 (1 bid)
HAMMARLUND SP-600-JX-17 COMPENDIUM VOL #2 - 190 PA
HAMMARLUND SP-600-JX-17 COMPENDIUM VOL #2 - 190 PA
Ends in 4 Days 15 Hours 15 Minutes 58 Seconds
Current price: $21.00 (1 bid)
HAMMARLUND  SP-600  TUBE  KIT
HAMMARLUND SP-600 TUBE KIT
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0RIGINAL 1952  Hammarlund SP-600JX & J MODELS
0RIGINAL 1952 Hammarlund SP-600JX & J MODELS
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Hammarlund SP-600 JX21A Operation & Service Ma
Hammarlund SP-600 JX21A Operation & Service Ma
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Hammarlund SP-600 Overhaul Manual Reprint
Hammarlund SP-600 Overhaul Manual Reprint
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LOT VACUUM TUBES HAMMARLUND SP-600 JX-16 HAM VINTA
LOT VACUUM TUBES HAMMARLUND SP-600 JX-16 HAM VINTA
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FILTER CHOKE HAMMARLUND SP-600 JX-16 HAM VINTAGE R
FILTER CHOKE HAMMARLUND SP-600 JX-16 HAM VINTAGE R
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For parts TRANSFORMER HAMMARLUND SP-600 JX-16 HAM
For parts TRANSFORMER HAMMARLUND SP-600 JX-16 HAM
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Current price: $119.00 (0 bids)
 Vintage Hammarlund SP-600 HAM Receiver front  LED
Vintage Hammarlund SP-600 HAM Receiver front LED
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For parts TRU-OHMS RESISTORS HAMMARLUND SP-600 JX-
For parts TRU-OHMS RESISTORS HAMMARLUND SP-600 JX-
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 DIAL POINTS HAMMARLUND SP-600 JX-16 HAM VINTAGE R
DIAL POINTS HAMMARLUND SP-600 JX-16 HAM VINTAGE R
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COMPONENT  HAMMARLUND SP-600 VINTAGE RADIO #E4-06
COMPONENT HAMMARLUND SP-600 VINTAGE RADIO #E4-06
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HAMMARLUND SP-600JX XTAL HOLD-DOWN SPRING CLIPS -
HAMMARLUND SP-600JX XTAL HOLD-DOWN SPRING CLIPS -
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Hammarlund SP-600 Parts Manual Reprint
Hammarlund SP-600 Parts Manual Reprint
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Hammarlund SP-600 Operation Manual Reprint
Hammarlund SP-600 Operation Manual Reprint
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Hammarlund SP-600 JX17 Operation & Service Man
Hammarlund SP-600 JX17 Operation & Service Man
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Hammarlund SP-600 Service Manual Reprint
Hammarlund SP-600 Service Manual Reprint
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HAMMARLUND SP-600 SP-600-J SP-600-JX ISSUE6 Manual
HAMMARLUND SP-600 SP-600-J SP-600-JX ISSUE6 Manual
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HAMMARLUND SP-600 SP-600-J SP-600-JX ISSUE4 Manual
HAMMARLUND SP-600 SP-600-J SP-600-JX ISSUE4 Manual
Ends in 23 Days 4 Hours 35 Minutes 20 Seconds
Current price: $11.99 (2 bids)
HAMMARLUND SP-600-VLF31 SP-600 VLF Receiver Manual
HAMMARLUND SP-600-VLF31 SP-600 VLF Receiver Manual
Ends in 23 Days 4 Hours 36 Minutes 5 Seconds
Current price: $11.99 (1 bid)
HAMMARLUND SP-600 PLASTIC FUSE COVER NOS
HAMMARLUND SP-600 PLASTIC FUSE COVER NOS
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Current price: $27.00 (0 bids)
HAMMARLUND SP 600-J X-17, AN 16-45-434/31R2-4-18-2
HAMMARLUND SP 600-J X-17, AN 16-45-434/31R2-4-18-2
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LOT 19 VACUUM TUBES LAMPS HAMMARLUND SP-600 VINTAG
LOT 19 VACUUM TUBES LAMPS HAMMARLUND SP-600 VINTAG
Ends in 25 Days 15 Hours 56 Minutes 43 Seconds
Current price: $319.00 (0 bids)

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