edward897 Posted November 25, 2003 Share Posted November 25, 2003 I have a pair of '80 Heresys. One of the K77 tweeters quit working. I opened the back and checked all the connections and they look good, nothing loose. I disconnected the tweeter leads and hooked the speaker wires directly to the tweeter and it makes sound. So I hooked it back up to the crossover and it works fine for a while then goes out again. Anyone know what the problem is? Thanks, Ed Quote Link to comment Share on other sites More sharing options...
JohnA Posted November 26, 2003 Share Posted November 26, 2003 Bad crossover cap? Open turn in the autoformer? Which crossover do you have? What is the DC resistance of your tweeter? Does the DCR change if you wiggle the terminals on the tweeter? Quote Link to comment Share on other sites More sharing options...
edward897 Posted November 26, 2003 Author Share Posted November 26, 2003 It's a Type E crossover. It measured like it was open then it would play a little. I'm think it's blown but then it works. It that possible? What kind of values should I get at the various points when I put a meter to it? Thanks, Ed Quote Link to comment Share on other sites More sharing options...
formica Posted November 26, 2003 Share Posted November 26, 2003 ---------------- On 11/26/2003 5:32:52 PM edward897 wrote: It measured like it was open then it would play a little. ---------------- Probably a dead or almost dead tweeter diaphragm. The enamel coating on the voice coil is probably partially gone... Try flipping a functioning tweeter with the bad one and see where the problem follows. Rob Quote Link to comment Share on other sites More sharing options...
3dzapper Posted November 26, 2003 Share Posted November 26, 2003 Yes, most likely a dying tweeter. (Been there, done that). The diaphram is easily replaced fairly inexpensively. Contact forum member BEC at bcrites@cswnet.com. He can fix you up with a new diaphram and if you feel that you are unable to change it out yourself will do it for a small additional charge. I have bought three tweeter diaphrams from him and can recommend him with no reservations. Rick Quote Link to comment Share on other sites More sharing options...
Q-Man Posted November 27, 2003 Share Posted November 27, 2003 This is what I have found wrong with a few of these tweeters. I bet the male disconnect on the tweeter is loose. It ratates side to side on it's rivit like connection, it should not move. In one position you will have sound and in another you won't. The original diaphragms have a hair like wire lead connected to this disconnect. Replacement diaphragms havs a study ribben wire and can handle this slight movement. Rotate the male disconnect on the tweeter untill you find the working position. Then epoxy or super glue it in place. If it's not too late the tweeter should be fine. If not, it's time to replace the diaphragm. I've told everyone on this Forum a number of times to epoxy the disconnects in plase on these tweeters. The hair like wires break very eacy. Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted November 27, 2003 Share Posted November 27, 2003 If you need a replacement diaphragm, a member of this forum, "BEC" has got them for sale on Ebay about all the time. I've done business with him and he's a good man to business with. Quote Link to comment Share on other sites More sharing options...
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