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Klipschguy

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  1. Great replies so far! I want to broaden the horizons of my LP collection, so thank you for your help (I tend to trust the ears on this forum). BTW, I am listening to Chet Atkins in Hollywood on YouTube - fantastic! Andy
  2. What do you all consider to be a five star album, where most every song is very good or excellent, AND the recording is audiophile quality as well? I'll start: Band On The Run, Paul McCartney, released 1973 (This recording is good enough to demo your system.) There are certainly others, but this album came to mind first.
  3. EMRR, Agreed: reforming will not help ESR; if a tired cap has a high ESR, it is at the end of its useful service life. Regards, Andy
  4. Thanks, Gil; I found and read the article. I know reforming (including the ongoing, self-healing process of regular use) of electrolytic filter caps is well established and important for good capacitor life, I am just not sure there would be any benefit for metallized crossover caps. Here is a basic, informative article on metallized cap self-healing for anyone who may be interested: https://blog.capacitorfaks.com/the-self-healing-characteristics-of-a-metallized-film-capacitor/ Regards, Andy
  5. Do you all have any thoughts on reforming crossover metallized capacitors using DC voltage? Replacement is probably the better option, but I am curious. Andy
  6. Thank you, Dean. The information you gave is what I am looking for. Andy
  7. Greetings All, I am planning on replacing the capacitors in my Cornwalls' B Networks. A forum search shows the cap-du-jour is the Arizona Blue Cactus, which as you know, is a Paper/Mylar/Oil/Aluminum Foil capacitor. I was thinking of using two Arizona 2uF in parallel for the 4uF cap, and a single Arizona 2uF cap for the tweeter leg of the circuit. (My understanding is paralleling caps reduces overall ESR vs a single cap of the same design that carries a summed capacitance value.) I do not care that much about the money (within reason). What I do care about is the sound and longevity of the caps. I would like the caps to give 20 to 30 years of good performance (maybe that expectation is unrealistic). I know the subject of capacitors has been discussed ad nauseum on this forum, but I cannot not find much written about sound AND longevity. Any thoughts are appreciated as I am certainly open to ideas. Best regards, Andy
  8. You all are right; it does not make a whole lot of sense to tear into a good pair of speakers (really, they are not that difficult to make). BTW, that is the first time I have seen a 2-way version of the Cornwall - impressive.
  9. It is my understand the new Cornwalls have the woofer mounted 6" higher on the motor board to help reduced the cabinets' standing wave issue. Has anybody here made a new motor board for older Cornwalls to locate the woofer 6" higher? I am not sure if the motor boards are screwed on or glued on (glued would probably be pretty difficult to remove). If motor board removal was not too difficult, it might be a worthwhile modification.
  10. Here is an old thread that has some information about the K400, the K5J, and the K500-5000 that someone may be interested in if they run across this thread while researching older Khorns. (Dean, I am glad you enjoyed the transformer lesson - it was pretty fun typing it. Also, my T2 windings are solid, tight, and have no loss of wax or any cracking of the enameled wire; the yellowed varnish is on the stamped silver metal strap with the screw holes in it as a some type of protective coating. We are just on different wavelengths with that varnish thing - too funny.)
  11. Well, for all practical purposes, the Klipsch autotransformers do not block the highs. Yes, the T2/T2A autotransformers have inductance as measured across the taps, but the autotransformer is not acting as an inductor in the circuit, but rather it is acting as a transformer. [And just in case someone may be interested: When an autotransformer receives a resistive load on the secondary winding (from a voice coil), the resistive load is then reflected as a higher impedance in the primary winding, commensurate with the turns ratio (autotransformer has taps). The higher impedance in the primary winding is then presented to the amplifier. When the amplifier sees the higher impedance, it results in less power to the driver, hence attenuating the relative volume of the driver. An iron core inductor, on the other hand, does not have primary and secondary coils like a transformer, it is just a 2 terminal wire wrapped around an iron core. Inductors do indeed come in handy for blocking high frequencies.] Admittedly, not all of the Khorn crossovers use the autoformer for the tweeter leg of the circuit (like the Klipschorn AA network, for instance), but other Heritage speakers, such as the Cornwalls, do use it and the "inductance laden" T2As certainly pass the highs effectively. Should autotransformers be used at all? Well, that question is for another day. Also, the old varnish on the T2's metal screw down strap won't affect the sound in the least; the strap's only function is support the iron core autotransformer so it can be held to the crossover board with the 2 wood screws. (Why is there even varnish on the strap? Corrosion resistance? Who knows.) The iron core, magnet wire assemblies retained within the straps are in perfect condition with no evidence of drying, or cracking, or corrosion. The pair of T2s I am using test well within spec on the bench and all taps test within 10% of a newer T2A I have (Klipsch specs allow 15% variance from published specs); there is no reason they are not just as good as the day they left the factory. Additionally, the taps match the old wiring diagrams to avoid possible future confusion. Does the additional inductance and resistance of an extra tap in the circuit affect the voicing? (The crossover does have the full inductance of autotransformer between the + and - inputs.)Well...maybe, maybe not. Regarding using the correct capacitors to voice the crossover? Um, of course...that goes without saying (but I am pretty sure you were joking). No worries, Andy
  12. The K400 reaches just a little lower than the K5J (around 50hz or so). See this thread*: *Thank you Bob Crites for all your hard work.
  13. Thank you, kindly for the recommendation.
  14. Dean, I decided to use the old T2 autotransformers in lieu of just buying a new T2A pair for a few reasons: 1. There are very few moving parts in the autotransformers, so the service life these things is incredibly long. Except for the yellowed varnish on the old T2 outer casings, they are in great condition. 2. Besides having a different number of taps, the T2 taps have a little different inductances versus the T2A. (BTW, I measured the autotransformers for your viewing pleasure; see the chart below.) I figure the voicing of these crossovers was done by PWK using the T2, so I am trying to keep the voicing of the crossovers the same. 3. The old wiring diagrams for the K 500-5000 show a T2, not a T2A which could lead to confusion in the future for someone else trying to work on the crossovers. For example, if they hook the leads to tap 3 of T2A, they will be in a totally different zone versus tap 3 of a T2. T2 inductance relative to the 0 tap: 1 = 6.7mH 2 = 15.7mH 3 = 35.9mH 4 = 98.5mH T2A inductance relative the 0 tap: 1 = 2.7mH 2 = 6.2mH 3 = 16.1mH 4 = 39.9mH 5 = 110.8mH
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