Good2BHome Posted November 28, 2001 Share Posted November 28, 2001 Who says: "You can't go home". I recently purchased a Cornwall pair that needed some attention, but the price was so right I could not refuse and they sounded great even with their "needs". In 1972 I bought new a pair of Klipschorns, but alas they were sold when we moved to a house they would not work in (about 1980). The Cornwall's serial #'s are not matched but close: 24U701 and 24U753. Step #1: Repair the one bad K-77-M. Testing the speaker for continuity, gives an result of an open circuit. My questions are: 1) How difficult is it to replace the K-77-M diaphragms? Is any one willing to walk me through the process? 2) Is it wise/necessary to replace the diaphragms for both K-77-M's. To my ears the other one is fine??? 3) Are ALL replacement diaphragms actually made by Electro Voice? If there are others, are they any good. 4) Does anyone have suggestions for sources in addition to Klipsch for the diaphragms? or shops that will do the replacement for me. 5) Do the Electro Voice T-35 mounting holes match the K-77-M? 6) The serial #'s of my two K-77-M's are 48781(bad) and 19005. The numbers are pretty far apart, unlike the serial #'s of the other 2 speakers. Makes me wonder if the entire K-77-M was replaced in the past or if one Type "B" crossover may be bad. Is there a way I can test it? I only have a Digital Multimeter. Having said all this "dry" stuff they SOUND GREAT. Any and all advice is appreciated. If some will tell me how I will post pictures. Mike Quote Link to comment Share on other sites More sharing options...
Klipschguy Posted November 28, 2001 Share Posted November 28, 2001 Do a search on this bulletin board under "diaphragm replacement", or just "diaphragm." The info your looking for has been outlined in detail. Andy Quote Link to comment Share on other sites More sharing options...
ChrisK Posted November 29, 2001 Share Posted November 29, 2001 Funny you should ask this question....I just repalced my K-77 diaphragms last night (I have 1978 Cornwalls.). I observed the first one being done by a professional and then repeated the process at home. Not tough at all. If you order the replacements from Klipsch, instructions are included. Free Advice (worth what you are paying for it): - replace both of them at the same time - be very careful with the voice coils they are quite fragile - follow the instructions carefully..they are very informative. Mike, Feel free to email for further details. Pictures of my Cornwalls are on this board under the topic heading "Cornwalls Arrived". Regards, Chris cjk1026@ix.netcom.com ------------------ HT Klipsch KG2.5 (front & rear) Klipsch KV2 (center) Klipsch SW12 (sub) Marantz SR700 receiver Toshiba DTS DVD JVC SVHS VCR Sony Hi8 VCR 2 channel Klipsch Cornwalls (1976) Decware Zen SE84C amp Arcam Alpha MCD cd player Quote Link to comment Share on other sites More sharing options...
mike stehr Posted November 29, 2001 Share Posted November 29, 2001 I bought two Diaphrgms for K-79 tweeter. It's real simple to replace, they give you instuctions, but be careful of the dome. (Though the mid horn's dome is more than likely harder than tweeter domes.) I was kinda leary when I replaced these, but its easy. I'm sure the Diaphragm replacement for mid's is the same way. THANX! Quote Link to comment Share on other sites More sharing options...
Good2BHome Posted November 30, 2001 Author Share Posted November 30, 2001 I'm doing the searches suggested and will post the results of the research. I appreciate the responses so far. Mike This message has been edited by Good2BHome on 12-12-2001 at 05:34 PM Quote Link to comment Share on other sites More sharing options...
Good2BHome Posted December 12, 2001 Author Share Posted December 12, 2001 The research was completed. Suggestion to future searchers: Search both diaphragm and diaphram replacement. I called Electro Voice @ 1-800-685-2606. They quoted 21.70 + 4.00 shipping each. They would do the repair for 25.00 each, however they were out of stock. They recommended an Authorized Service Center in Dallas. I called the repair center. Their price was 22.00 + tax and would do the repair for 12.00 each while I waited !! Well, for this price I don't need to learn how to do it (but I did). Yes, I did both K-77's, that seemed to be the consensus. They will accept speakers in the mail for repair. They are: Freeman-Tuell Speaker Repair Service 7911 Ferguson Rd. Dallas, TX 75228 1-214-324-1132 The K-77's are now installed in the Cornwalls. They sound great and I'm preparing for the next step in the Refurbishment. Thanks to all suggestions both on and off line. Mike ------------------ 3 Channel Audio: 1980 Cornwalls Klipsch Quartet as Rear The following I bought NEW in 1971: McIntosh MR-74 McIntosh C-26 McIntosh MC-2505 Quote Link to comment Share on other sites More sharing options...
fini Posted December 13, 2001 Share Posted December 13, 2001 I received two diaphragms from Electrovoice, and no instructions were included. I'm hoping to replace them before Christmas. Which posts were most informative? Anyone have photos of the process? Anytime someone says "It's easy, you've just got to be careful..." it makes me a bit nervous. I'm most concerned about de-soldering and alignment (although there are probably more areas where I can mess up). It took about six weeks to get the parts (they were out of stock), so I'd like to get it right the first time. Anyone have those talked-about instructions in postable or emailable form? Much thanks! fini p.s. I'm a handy guy, just cautious. Quote Link to comment Share on other sites More sharing options...
eq_shadimar Posted December 13, 2001 Share Posted December 13, 2001 Glad to hear that you got your Cornwalls fixed. Now there are at least 2 working pairs in Plano. We need to make sure that we don't crank 'em at the same time or a big crater may be formed in our town :-) Bye, ------------------ ...wake up to find out that you are the eyes of the world... My Home Theater Page Quote Link to comment Share on other sites More sharing options...
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