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mboxler

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About mboxler

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  1. That looks like a B2 crossover. Here's the schematic. Mike
  2. Nice build! Your 3619 autoformer is limited to -3, -6, -9, and -12db, but I see no reason why you can't move the tweeter circuit from tap 5 to tap 4. Looks like the DE10 around 3db hotter than the K77, and the load change on the 13uf capacitor isn't that significant. Mike
  3. I have always based my simulation (LTSpice) on an old post from Bob Crites (RIP). He measured 6.6mH across taps 4-5 of a 3619. Since those taps should equal 29.3% of the total windings, then I came up with 38.38mH across taps 0-4, and 76.76mH across taps 0-5. You probably should recheck my findings 🙂. Mike
  4. Autotransformer types and values: T2A(3110A) -3, -6, -9, -12db T3A(3465-M) -6db T4A(3485) -4db T5A(3496) -6db T7A(3504) -10db T8A(3507) -8db T9A(3540) -3db T10A(3542) -9db T11A -12db Looks like the T9A has only one tap, tap 4, which is -3db. It would be the same as a T2A using tap 4, also -3db.
  5. Better may have been a poor choice of word. In a true 3rd order Butterworth high pass filter, the second capacitor is 3 times larger than the first. 6.8uf is close enough. The 7.5uf would have been fine also, but I assumed you wanted to stay with CSA's. Looking on Al's website, in the Super AA-X section, you'll see how he converts AA to something close to the Universal. Can't make out the second cap value, but I believe it's 6.8uf. Notice also that he doesn't replace the 2.5mH woofer inductor as a part of the conversion. Also, schematic doesn't show the 1.5 amp fast blow fuse. I had it in initially but removed it when I swapped out the woofer inductor. Have fun with your project! What squawker/tweeter are you using? I also made a couple of other tweaks that you may want to try later, but they can be added to the finished crossover easily. Mike
  6. Actually the Clarity Cap CSA 6.8uf will be a better choice.. I got the Solen 7.5uf now.
  7. Yes, that is the same as the kit I built many years ago. I have, in the mean time, made a couple changes... Replaced the 1.3mH inductor with a 2.5mH for the woofer. Replaced the .2mH inductor with a .15mH for the tweeter. The 2.5mH inductor seemed to tighten the bass. The tweeter inductor swap seemed to smooth out the the top end a little. Mike
  8. You pressed submit a few seconds before me. I should have deleted my post.
  9. Yes, 2.7 is close enough. Surprised that it is that far off! 4.0uf parallel to another 4.0uf will be 8uf. 4.0uf in series to another 4.0uf will be 2uf. Are you sure they aren't 1uf caps?
  10. After further research... Plane Wave Freq. Response 110Hz - 4.1kHz (±5dB) But I've read that in a K-400 it does go up to 6KHz. Not that I know what plane wave frequency response is.🥺
  11. I thought the LS5 and AK6 crossed at 4500Hz, around the natural cutoff of the pd-5vh.
  12. Have you tried inverting the polarity to the pd-5vh? That may create a hump at the crossover that you might like. I've read that the pd-5vh only goes to 4500Hz??? If that's the case, the high pass to the tweeter is around 6000Hz. Seems like there would be a hole there too.
  13. I'm not sure it has a name, so I refer to it as an underdamped second order filter. I assume it was designed for the K-55M driver. Attached is my electrical simulation of the voltages across the K-33E and K-55M. I multiplied the K-55M voltage by 1.585 to account for the T4A's attenuation. As you can see, the adjusted voltages "cross" around 300Hz. Notice that the polarity of the K-55M is not reversed, even though the voltages are roughly 180 degrees apart. Normally this would create a null at the crossover frequency, but I believe the underdamped nature of the filter compensates for that. Then again, I could be totally wrong, but I tend to learn more be being so. Mike
  14. I believe you meant to say "at most" 100 ohms in line with the tweeter. When low current is passing through the circuit, the switch is low resistance (0 ohms?), and all the current is flowing through the switch and tweeter. 0 ohms in parallel with 100 ohms is 0 ohms. If too much current is flowing through the switch, it's resistance increases, and current begins to flow through the resistor as well. This continues until the switch can cool. Until then, there is a voltage drop across the switch//resistor, and therefore less voltage across the tweeter.
  15. Sorry...I meant tweeter. Your DE10-8 can handle 40 watts, so if I were you I'd replace the K-77 protection circuit with a wire. Mike
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