bluesboy Posted January 28, 2009 Share Posted January 28, 2009 between carbon resistors and cement resistors? Can they be interchanged if the values are the same? Quote Link to comment Share on other sites More sharing options...
Guest " " Posted January 28, 2009 Share Posted January 28, 2009 carbon resistors are based on different densities of a carbon mass inpetween 2 conductors. cement resistors are wire wound over a form and the wire itself has the resistance quality. there are some behavior difference's, but no to stop the substitution. as carbon resistors exceed their watt ratings...the're resistance increases and more heat is generated....more resistance....more heat...more resistance...more heat...etc..the cycle continues til there is so much heat that the resistor flames out. cement resistors come in two flavors. inductive and non inductive. they're resistance is less effected by heat. in tube amps, a lot of folks prefer carbon resistors and would rather flame out a carbon resistor than a power transformer. Quote Link to comment Share on other sites More sharing options...
jacksonbart Posted January 28, 2009 Share Posted January 28, 2009 Its the same difference Quote Link to comment Share on other sites More sharing options...
JJkizak Posted January 28, 2009 Share Posted January 28, 2009 All of a sudden now wire wound resisters are called cement resisters? What gives with the concrete? JJK Quote Link to comment Share on other sites More sharing options...
bluesboy Posted January 28, 2009 Author Share Posted January 28, 2009 Speakerfritz, these resistors are to be used in a ALK type B network that I am building for a friend of mine for his 74 Cornwalls. Would there be any problems that you could see using the cement resistors in this application? Quote Link to comment Share on other sites More sharing options...
Marvel Posted January 28, 2009 Share Posted January 28, 2009 The cement/wriewound would work just fine, but you should use the non-inductive ones for that application. Bruce Quote Link to comment Share on other sites More sharing options...
bluesboy Posted January 28, 2009 Author Share Posted January 28, 2009 How can tell if they are non-inductive? Quote Link to comment Share on other sites More sharing options...
jacksonbart Posted January 28, 2009 Share Posted January 28, 2009 they would not induct. Quote Link to comment Share on other sites More sharing options...
oldenough Posted January 28, 2009 Share Posted January 28, 2009 they would not induct.JB you really are sad[][][Y] Quote Link to comment Share on other sites More sharing options...
Marvel Posted January 28, 2009 Share Posted January 28, 2009 How can tell if they are non-inductive?If you look in a Mouser, Newark, or Digi-Key catalog, you can find them listed. You really wouldn't want inductive wirewounds on a crossover, as you will probably end up changing the crossover points.Bruce Quote Link to comment Share on other sites More sharing options...
bluesboy Posted January 28, 2009 Author Share Posted January 28, 2009 Thanks Marvel Quote Link to comment Share on other sites More sharing options...
Deang Posted January 29, 2009 Share Posted January 29, 2009 Use the recommended Xicon 5.6 ohm 3w metal oxide resistor. http://www.mouser.com/Search/ProductDetail.aspx?qs=sGAEpiMZZMvhlCB8CTbT5BXNceG4Bd1YnjAfbDbRj%252bk%3d Use a Mills 10 ohm for the connection across taps 5 and 0 on the autoformer. http://www.parts-express.com/pe/showdetl.cfm?Partnumber=005-10 This page has the part numbers for Cinch 141 terminal blocks and 'Y' solder terminals. I don't like the parts from Molex. http://www.mouser.com/catalog/636/1487.pdf I would get some of these too. This part number fits the 141 Cinch terminal blocks. http://www.mouser.com/Search/Refine.aspx?Keyword=534-7312 Quote Link to comment Share on other sites More sharing options...
Deang Posted January 29, 2009 Share Posted January 29, 2009 Since you have to buy the Litz coils from Solen, might as pick up a handful of their high quality film and foil caps for the tweeter filter. Very affordable for what they are. Get a pair of 2.2's and a pair of .22's. Parallel the .22 with a 6.8 Solen "Fast" cap. http://www.solen.ca/pub/cms_nf_catalogue.php?niveau1=1&niveau2=3&niveau3=27&origniveau=/pub/cms_nf_catalogue_niveau3.php?q=Jm5pdmVhdTE9MSZuaXZlYXUyPTMmc2VjdGlvbj0yJnNvdXNfc2VjdGlvbj0zJmZ0PW5m Quote Link to comment Share on other sites More sharing options...
bluesboy Posted January 29, 2009 Author Share Posted January 29, 2009 Dean, thanks very much for your post and taking the time to share your pictures. They will be a big help along with your parts suggestions. I ordered the 12 watt resistors from Parts Express. I can't believe they are charging me 9 bucks to ship 2 resistors. I already have the terminal blocks and and solder lugs from Mouser. I already have the caps too. I'm using 2.2 Hovland music caps, 1.0 Harmony bypass caps and 6.2 Solen fast caps in the tweeter filter. Quote Link to comment Share on other sites More sharing options...
djk Posted January 31, 2009 Share Posted January 31, 2009 Wirewound resistors have a trivial amout of inductance at audio frequencies, when used in crossover networks. Having said this, push-pull audio amplifiers that are not biased into class A need to have non-inductive resistors (which can exacerbate crossover-notch distortion). Some inexpensive cement-boat wire-wound resistors sound poor, due in part to copperweld leads (steel) that are crimped to the resistive element. Mills resistors are good quality, and not too expensive. Quote Link to comment Share on other sites More sharing options...
bluesboy Posted January 31, 2009 Author Share Posted January 31, 2009 These resitors I got from Mouser have XICON stamped on them. Quote Link to comment Share on other sites More sharing options...
bluesboy Posted February 3, 2009 Author Share Posted February 3, 2009 This is getting frustrating. I have not been able to locate a 10w 5.6 ohm non-inductive resistor any where. I emailed Al at ALK last week and have not heard from him. Any ideas? Quote Link to comment Share on other sites More sharing options...
Marvel Posted February 3, 2009 Share Posted February 3, 2009 I got this on a search of the Mouser web site. 10W 5.6 Ohm, non inductive version listed on page two of the pdf.They're vishay / dale rsns.pdf Quote Link to comment Share on other sites More sharing options...
bluesboy Posted February 3, 2009 Author Share Posted February 3, 2009 I got em. I found some Dayton non-inductive resistors with the correct values at Parts Express. Thanks for taking the time to help out Marvel. Quote Link to comment Share on other sites More sharing options...
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