{"id":46905,"date":"2020-12-13T08:19:16","date_gmt":"2020-12-13T12:19:16","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=46905"},"modified":"2020-12-13T08:21:39","modified_gmt":"2020-12-13T12:21:39","slug":"dans-respect-for-hammarlund-and-the-sp-600-series","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2020\/12\/dans-respect-for-hammarlund-and-the-sp-600-series\/","title":{"rendered":"Dan’s respect for Hammarlund and the SP-600 series"},"content":{"rendered":"

\"\"<\/a>Many thanks to SWLing Post<\/em> contributor, DanH, who shares the following comment in response to this news article from the Citizen Times<\/a> featured in Radio Waves yesterday<\/a>:<\/p>\n

Here are my thanks to members of the Amateur Radio community and The News-Record & Sentinel for remembering the legacy of Hammarlund Manufacturing Company Incorporated. It is good to know that this part of our radio history is valued and preserved. I loved the newspaper article!<\/p>\n

I have a few vintage Hammarlund radios including two Super-Pro models. The SP-600-JX-21<\/strong> is one of my daily drivers. This relatively late production SP-600 is in stock condition with the exception of a half dozen electrolytic capacitors that I replaced mostly in the power supply. By the time this SP-600 was built in 1957 Hammarlund had replaced the short-lived black beauty electrolytes with ceramic disc capacitors. Like military and industrial users I upgraded the original nickel plated tube shields with IERC heat dissipating tube shields where possible. I also installed vintage GE No. 1847 long-life incandescent bulbs as direct replacements for the brighter (too bright, for me) No. 47 dial lamps.<\/p>\n

Here are my two most recent reception videos of the SP-600. The first features reception of Radio National da Amazonia and the second is a brief operating demo of the SP-600. The loudspeaker used in both videos is a full-range vintage Jensen 10? with matching transformer from the 1950\u2019s instead of a communications range speaker typically used with these radios. This makes a big difference when listening to broadcasts.<\/p>\n

This old Hammarlund is still working pretty well.<\/p><\/blockquote>\n

RN da Amazonia<\/h1>\n