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BEC

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BEC last won the day on January 27 2014

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About BEC

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  1. Some of the crossover designs have a resistor in parallel with the poly switch which allows the tweeter to continue working at a much reduced level when the polyswitch opens. Some like the KG-4 just have the polyswitch so the tweeter will go completely silent when the polyswitch opens. Bob Crites
  2. Happens pretty often to the woofer circuit since that one has no cap in series. Normally not for the other two drivers since they both normally are protected by the DC blocking ability of a cap. And usually the woofer voice coil opens before the fire can get going really good. But if you leave the cap out of the autotransformer circuit you have no such "fuse" like a woofer voice coil to save you.
  3. I breadboard a similar circuit often when doing testing to enable easy changes in attenuation. However, when I decide on the attenuation, I revert that circuit back to having the cap before the autotransformer. I just would not feel safe leaving that large low resistance coil in there for the long term as a direct low resistance path to ground. Thinking of course here of the chance that the amp could fail and put a high current DC supply across that autotransformer coil. Now that can and does happen with the woofer circuit. But in that case, generally the relatively small woofer voice coil opens petty quickly taking the path for current away. The autotransformer with much larger wire will just continue to cook until something in the amp gives up. Like I said, just can't get comfortable leaving that in the circuit long term and without me right there monitoring it. Bob Crites
  4. Both the K-77D and K-77F were made by Daiichi in the Philippines.
  5. There is much more to that than Dean said. I could probably build a type A crossover from scratch quicker than I could turn an E-2 into a type A. Lots of rewiring on the terminal strips (which are fragile by that age and likely to break) and also the inductor is wrong value and would have to be replaced. And with what the guy is selling that pair of E-2 for, probably cheaper to buy a new pair of type A.
  6. Dean you need to take a good look at the E-2 schematic.
  7. Normally autotransformers are used to attenuate or reduce the output of a driver. In the case of the CF-4 the autotransformer is installed backward and it effectively boosts the output by 4db. Bob Crites
  8. I have had better luck with just single runs of coat hangers. Twist too many together and you get something similar to a toroidal flux inductor and those are dangerous.
  9. This thread almost makes me want to go dig out those coat hangers again. Bob Crites
  10. I guess you mean the z-bracket holes compared to the K77D mounting holes? I am not certain about that. Would have to get some out to compare them. Bob Crites
  11. Actually, I do not think you could. Your corners of the cutout are rounded. I think they would have to be squared off to have that horn fit. They stopped squaring off the corners at some point before yours were produced. Some people have used them by doing some file work on the corners.
  12. This picture shows the newer K-77D and the K-77F with z-brackets installed behind it. Bob Crites
  13. Hole size is decreased in 2018 Lascala II. Not sure exactly what year they reduced the size. First of the Lascala IIs used the K-77F with standard size horn used by all earlier K-77M tweeters allowing the entire horn to extend through the motor board with z-brackets. Even after the change to the K-77D for some number of years the larger hole was maintained and earlier tweeters could be fitted to those holes using z-brackets. As of 2018 (and perhaps some years earlier), only the K-77D could fit in the holes and no way to use the earlier K-77F or K-77M tweeters. Attached is a picture of the K-77D installed in a 2018 Lascala II. Bob Crites K77D_in_2018_Lascala.pdf
  14. @simon Send me an email at bobcrites@mac.com Thanks, Bob Crites
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