KT88 Posted October 9, 2022 Share Posted October 9, 2022 But even 2 watts are really very loud when driven in the appropriate frequency range. Quote Link to comment Share on other sites More sharing options...
Deang Posted October 9, 2022 Share Posted October 9, 2022 AK series of networks have fuses. AL series have either zeners or polyswitches. Each has drawbacks. I think most listen too loud. I still think the best tweeter protection is your volume control and being able to recognize when a driver is in distress. 3 Quote Link to comment Share on other sites More sharing options...
OO1 Posted October 9, 2022 Share Posted October 9, 2022 On 10/8/2022 at 4:33 PM, JohnA said: K-77-Ms don't need the diaphragms replaced. They came with the ribbon lead diaphragm that carries the higher rating. a higher quality Diaphragm with BE leads was found in some late 70's Alnico K -77 , BE leads were also found In some Ferrite EV T-35 , but that was not across the board as acute Berylliosis Regulations in the workplace forced EV to stop using BE leads , Quote Link to comment Share on other sites More sharing options...
KT88 Posted October 9, 2022 Share Posted October 9, 2022 11 minutes ago, OO1 said: a higher quality Diaphragm with BE leads was found in some late 70's Alnico K -77 , BE leads were also found In some Ferrite EV T-35 , but that was not across the board as acute Berylliosis Regulations in the workplace forced EV to stop using BE leads , That is very interesting, Randy. Do you know the exact years of production or some recognition sign without opening the tweeter? Maybe a number or text on the tweeter? Mine are from 1977. Quote Link to comment Share on other sites More sharing options...
Moderators Travis In Austin Posted October 10, 2022 Moderators Share Posted October 10, 2022 1 hour ago, OO1 said: a higher quality Diaphragm with BE leads was found in some late 70's Alnico K -77 , BE leads were also found In some Ferrite EV T-35 , but that was not across the board as acute Berylliosis Regulations in the workplace forced EV to stop using BE leads , You mean Copper/BE alloy (flat wire) leads right? Quote Link to comment Share on other sites More sharing options...
OO1 Posted October 10, 2022 Share Posted October 10, 2022 10 minutes ago, Travis In Austin said: You mean Copper/BE alloy (flat wire) leads right? yes Quote Link to comment Share on other sites More sharing options...
tigerwoodKhorns Posted October 10, 2022 Share Posted October 10, 2022 5 hours ago, deang said: AK series of networks have fuses. AL series have either zeners or polyswitches. Each has drawbacks. I think most listen too loud. I still think the best tweeter protection is your volume control and being able to recognize when a driver is in distress. I had a bad pot on a Peach, Mark replaced the pot but the fuse lit up the room. Glad I had them. Quote Link to comment Share on other sites More sharing options...
OO1 Posted October 10, 2022 Share Posted October 10, 2022 (edited) @KT88Heinz , 1977-78 through 1985 is my best guess , I have some of the latest manufactured , EV T-35 units ( NOS ) 6,2 Ohms DCR , and they dont have Copper /BE leads . but I have much earlier EV tweeters and they all have it . the EV diaphragms without BE leads were also good quality , klipsch filtered EV's diaphragms through quality control , EV T-35 8 Ohms 3.5Hz /20KHz Alnico V EV T-35A 8 Ohms 3.5Hz /15KHz - 16KHz Ferrite EV T-350 8 Ohms 3.5Hz /23KHz Alnico V Edited October 10, 2022 by OO1 1 Quote Link to comment Share on other sites More sharing options...
KT88 Posted October 10, 2022 Share Posted October 10, 2022 Great info, thanks a lot, Randy👍 Quote Link to comment Share on other sites More sharing options...
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