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BEC last won the day on January 27 2014

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  1. I first tried to do this back in 2011 right after working out the 2-way Cornscala Style D using the HF140 and LTH142. Essentially just adding a tweeter to cover the top of the HF in the Style D. Never made that combo really work to my satisfaction. This current attempt will not likely be the HF140. Not sure what it will be yet. I have a couple of different candidate drivers to use for the midrange, just need to find the time to do more testing. Bob Crites
  2. I have also had a similar setup just in the mock-up stage for quite some time. Working through driver selection currently. Have not yet settled on exactly which driver to use for the midrange. Pretty sure I have the tweeter nailed down. Bob Crites
  3. Thanks for that zener part number. The 1N2973B is a 9.1 volt zener. The zener used in the AA crossover is a 5.1 volt. That means considerably more power is allowed to the tweeter in the KP 2.5A than was allowed by the AA crossover. Bob Crites
  4. I have seen a picture of the 2.5A but have never found a schematic or had my hands on the actual crossover. I appears to use the same cap set as the 2.5B crossover except the 2.5uF caps were done using a 1.5uF and 1uF in parallel. Also the zeners were on it but I don't know what part number zener was used. Doesn't seem to be the same zener used on the Type AA crossover. Bob Crites
  5. 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
  6. 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.
  7. 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
  8. Both the K-77D and K-77F were made by Daiichi in the Philippines.
  9. 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.
  10. Dean you need to take a good look at the E-2 schematic.
  11. 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
  12. 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.
  13. This thread almost makes me want to go dig out those coat hangers again. Bob Crites
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