Deang Posted September 2, 2019 Share Posted September 2, 2019 Does anyone known anything about this thing. An ex Klipsch engineer in the owners group on facebook said it had an alnico magnet, and klipsch couldn't get them made anymore because alnico was being sourced through the russians - which stopped sending it to the united states. I've seen pictures of the thing, and the magnet looks the same as the old K-33-E square magnet version. Quote Link to comment Share on other sites More sharing options...
WMcD Posted September 2, 2019 Share Posted September 2, 2019 Gee, that is a bit strange. My recall is probably what everyone knows: It is that cobalt became unavailable due to civil war in Congo. Of course needed to make Aluminum-Nickel-Cobalt. Then manufacturers went over to ferrite which is (I think) similar to the coating on magnetic tape. To make magnets a slurry of the stuff (or mud) is poured into molds. Then drivers using this got an -M suffix for mud. https://en.wikipedia.org/wiki/Ferrite_(magnet) Therefore, what you're referring to seems backwards. An -M would not be an alnico, it would be a ferrite mud replacement for an alnico. WMcD 1 Quote Link to comment Share on other sites More sharing options...
Budman Posted September 2, 2019 Share Posted September 2, 2019 from the k-horn time line papers Sept 1967 transition to the K-33 M no sure the origin of this driver but believed to be an Eminence driver with alnico magnet Quote Link to comment Share on other sites More sharing options...
JRH Posted September 3, 2019 Share Posted September 3, 2019 The K-33-M was a Jensen driver with a 54 ounce ceramic magnet and a paper edge. It replaced their earlier version that used a ring Alnico magnet. In 1974 when I started at Rola, a large part of my job was converting Alnico structures to ceramic. This was due to Cobalt becoming a strategic resource, with Uncle Sam getting first dibbs. 2 1 Quote Link to comment Share on other sites More sharing options...
mopardave Posted October 2, 2019 Share Posted October 2, 2019 On 9/3/2019 at 9:55 AM, JRH said: The K-33-M was a Jensen driver with a 54 ounce ceramic magnet and a paper edge. It replaced their earlier version that used a ring Alnico magnet. In 1974 when I started at Rola, a large part of my job was converting Alnico structures to ceramic. This was due to Cobalt becoming a strategic resource, with Uncle Sam getting first dibbs. I have a K33E woofer like the one in the pic in good working order. What is the resale valve on these? Quote Link to comment Share on other sites More sharing options...
hanksjim1 Posted October 2, 2019 Share Posted October 2, 2019 based on the 220724 code on the speaker, it appears this woofer was produced in the 24th week of '67 here's a pic of the previous K-33J version from the 47th and 49th weeks of '66 Quote Link to comment Share on other sites More sharing options...
JRH Posted October 3, 2019 Share Posted October 3, 2019 I can't help you on resale value. My guess is "not much", in that it has no "glitz" or sex appeal like an EV 15K or the Stephens units. Quote Link to comment Share on other sites More sharing options...
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