Marvel Posted July 27, 2016 Share Posted July 27, 2016 Well, for converting to the AA, he could reuse 2.5mH inductor and that is all. As I mentioned most of the AL crossovers do not have the zener diodes (expensive) shown on the drawing above that you need to make the AA. You would also need a 245uH inductor, the autotransformer and the caps. You could get by with my 3654 autotransformer which is like the T2A and is a bit less expensive than the 3636. Again, hard to make that work out as a worthwhile project. You can get the zeners for about $15 each, which, in the big picture is a drop in the bucket. Bruce Quote Link to comment Share on other sites More sharing options...
tigerwoodKhorns Posted July 27, 2016 Share Posted July 27, 2016 Well, for converting to the AA, he could reuse 2.5mH inductor and that is all. As I mentioned most of the AL crossovers do not have the zener diodes (expensive) shown on the drawing above that you need to make the AA. You would also need a 245uH inductor, the autotransformer and the caps. You could get by with my 3654 autotransformer which is like the T2A and is a bit less expensive than the 3636. Again, hard to make that work out as a worthwhile project. You can get the zeners for about $15 each, which, in the big picture is a drop in the bucket. Bruce Bruce, Do you have a link for the Zeners? I used a 1.5 fast blow fuse (per the ALK Type A's from years ago) and they worked well. Do you recommend the Zener's instead? Quote Link to comment Share on other sites More sharing options...
Skelt Posted July 27, 2016 Share Posted July 27, 2016 Are these not the right zeners? I copied this link from page 1 http://www.parts-express.com/12v-5w-zener-diode-do-15-case--1n5349 Quote Link to comment Share on other sites More sharing options...
mustang guy Posted July 27, 2016 Author Share Posted July 27, 2016 (edited) Are these not the right zeners? I copied this link from page 1 http://www.parts-express.com/12v-5w-zener-diode-do-15-case--1n5349 Sorry but no. Thanks to your post, I did some research and found that the Zener diodes need to be 10 watt (5.1v). Furthermore, there are two Zener diodes per crossover. I have updated the original post to reflect the cost of these products, but suffice to say they are indeed very expensive. The total cost is over $120 per pair of networks before shipping. Klipsch community I need your help. I have a question for you. What tweeter protection can you install if you don't have a Zener pair on the AL you own? What about the protection on the AL-3 or on the KP-201? Edited July 27, 2016 by mustang guy Quote Link to comment Share on other sites More sharing options...
BEC Posted July 27, 2016 Share Posted July 27, 2016 Are these not the right zeners? I copied this link from page 1 http://www.parts-express.com/12v-5w-zener-diode-do-15-case--1n5349 Sorry but no. Thanks to your post, I did some research and found that the Zener diodes need to be 10 watt (5.1v). Furthermore, there are two Zener diodes per crossover. I have updated the original post to reflect the cost of these products, but suffice to say they are indeed very expensive. The total cost is over $120 per pair of networks before shipping. Klipsch community I need your help. I have a question for you. What tweeter protection can you install if you don't have a Zener pair on the AL you own? What about the protection on the AL-3 or on the KP-201? I buy those in large quantity so could provide them at a significantly lower price than you show. Bob Crites 1 Quote Link to comment Share on other sites More sharing options...
tigerwoodKhorns Posted July 27, 2016 Share Posted July 27, 2016 In the original ALK Type A, he had a 1.5 amp fast blow fuse at the input. Will that not protect the tweeter and the rest of the drivers or can a spike make it through that will still destroy the tweeter? I had one blow once and it did what it was supposed to do. 1 Quote Link to comment Share on other sites More sharing options...
Marvel Posted July 27, 2016 Share Posted July 27, 2016 The 1N3996 that I found (the correct part...) is out of stock, but it was from Allied Electronics. You could contact them for a lead time to get some. A group buy would be the right thing. Bruce 1 Quote Link to comment Share on other sites More sharing options...
Quiet_Hollow Posted July 27, 2016 Share Posted July 27, 2016 I think it's also worth mentioning here that the AL shares some parts with the HIE networks. One T2A transformer, an inductor, and an EVM 12ML or Delta Pro driver would convert a standard Heresy into the loud-mouth HI version. 1 Quote Link to comment Share on other sites More sharing options...
Olomana Posted January 31, 2018 Share Posted January 31, 2018 bored waiting for me new crossovers. Has anyone else tried this conversion, particularly the @wdecho one? Might have some time with a solder iron in the summer? Quote Link to comment Share on other sites More sharing options...
jimjimbo Posted January 31, 2018 Share Posted January 31, 2018 3 minutes ago, Olomana said: bored waiting for me new crossovers. Has anyone else tried this conversion, particularly the @wdecho one? Might have some time with a solder iron in the summer? Yes, I believe Carl has....you can ask him. @CECAA850 Quote Link to comment Share on other sites More sharing options...
slk23 Posted November 6, 2018 Share Posted November 6, 2018 I have a pair of 1985 La Scala's (industrial style) with AL crossovers (no zener diodes) that I suspect could use a refresh. Are there more reports on the "wdecho mod"? Would that mod work well for high volume listening? Also, while I don't mind adding the zeners I wonder how important they are; my speakers were driven at max. levels with a Hafler 250 watt/channel amp for hours at a time back in the '80s. I blew a few fuses on the speakers but never lost a tweeter. TIA. Quote Link to comment Share on other sites More sharing options...
JohnW Posted February 3, 2022 Share Posted February 3, 2022 On 11/5/2018 at 4:06 PM, slk23 said: I have a pair of 1985 La Scala's (industrial style) with AL crossovers (no zener diodes) that I suspect could use a refresh. Are there more reports on the "wdecho mod"? Would that mod work well for high volume listening? Also, while I don't mind adding the zeners I wonder how important they are; my speakers were driven at max. levels with a Hafler 250 watt/channel amp for hours at a time back in the '80s. I blew a few fuses on the speakers but never lost a tweeter. TIA. I'm in exactly the same position. '85s with ALs. need a recap. Don't need to buy 20 caps. Quote Link to comment Share on other sites More sharing options...
JohnW Posted February 6, 2022 Share Posted February 6, 2022 On 2/2/2022 at 7:30 PM, JohnW said: I'm in exactly the same position. '85s with ALs. need a recap. Don't need to buy 20 caps. But screw it I did buy the Dayton Audio caps just to see what happens while I save up for some real crossovers. Quote Link to comment Share on other sites More sharing options...
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