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Curious_George

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About Curious_George

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  • Birthday 08/19/1964

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    Male
  • Location
    Stoneville North Carolina
  • Interests
    Home & car audio, speaker design & building, analog audio (not much on digital), amplifier and signal processor design.

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    big_punishure@yahoo.com

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  1. Underside is not as clean as I would like, but it is more of a test bed than anything.
  2. Here is a 211 based amp I built about 20 years ago, but recently modified it with a interstage transformer. Class A SE, 25 Watts, no feedback (but have been thinking about adding some feedback lately just to mess around with it).
  3. For simplicity, yes, you can go by uF/voltage. Cap types have different characteristics (electrolytic vs film, etc.), but you've got to learn and get started somewhere, so use what you can and keep tweaking it until you are satisfied and have learned more.
  4. The spec sheet says for "full power handling", 1200Hz, 12dB/octave is recommended, so basically, you could cross this driver over just about anywhere you needed to match the mid-range driver. There is a lot of versatility with this driver. The D260my-B comes with a 2/3 bolt to 1" adapter. It is also a ring radiator, which some people may not be a fan of, but I think it sounds outstanding. I have not heard the B&C DE120, but the 260My-B is the most natural compression driver "tweeter" I have heard. It sounds like a nice dome tweeter, but compression based. Your horn selection will also affect the sound, but the APT200 has a good reputation for tweeter applications. Price does not usually sway me, but I believe the old saying "you get what you pay for", however, there are exceptions and you can find less expensive alternatives in most cases. Plus, half the fun is seeing what is out there and trying it, especially when it comes to audio. I also recently bought some Selenium ST200 tweeters and for $19.99 they are unbelievable. Almost (i am guessing because I've never heard them) like a T-350, but better. The ST200 has the same tonal character as the K77, because it is phenolic too, but more power and wider frequency response so you can cross it over lower (if needed). It blows away the K77 for power handling, if you need that too. No shaping per say on the 260My-B, just connected to the same tap as the K77 on the crossover (universal Heritage type that you can find here on the forum).
  5. I recently bought a pair of these compression drivers and have been experimenting with them on an Eminence APT200 horn. I moved recently and don't have all my equipment set-up, but just from listening they seem to be a good candidate for Klipsch Heritage speakers. I have them sitting on top of my LaScala's with the K77 disconnected. They look to have inherited some JBL technology in the phase plug area. Has anybody else heard or played around with these? PRV-Audio-D260My-B-Datasheet.pdf
  6. Here is a cleaned up schematic with the correct values for LaScala's with Type AA or Heresy's with Type E crossover. After listening for sometime, I discovered a low mid-range bloom in the LaScala's and added the 80uF cap across the woofer making the woofer section 12dB/octave. I can't find the REW graph I generated when I added the 80uF cap, but it definitely took care of the anomaly. Edit: I should remind members looking at this thread that my LaScala's are ported, so you may or may not need the 80uF cap. Experiment and decide. You can attenuate the midrange and tweeter to your liking.
  7. I've driven my LaScala's with various solid state amps and tube amps (PP & SE) and the LaScala's always sound great. Does the amp make the LaScala's sound different? Yes. I guess it depends on the mood you are in and if you want to listen critically or just have background music. I have a Music Angel XD850 Mklll that has been redesigned (by me) and it has turned out to be one of my favorite amps - 6.5 watts/ch. It drives the LaScala's with ease and sounds great. No problem at all driving the speakers. However, I must emphasize that I am not using the original AA crossover, but a variation of ALK's universal heritage crossover. This will help keep the impedance constant and easier for the SE amp to drive. I did not do a comparison with my modified crossover and the OE AA crossover so I do not have any comparison for that, but the new crossover does make an audible difference with tube or SS amps.
  8. Broadcast FM is far from dead, much less AM. As Fast996 pointed out, new music is a driver for their audience, but it depends on the format of the station. Of course advertisement is what makes this possible for the listener. When HD Radio was first introduced, HD maintained that is was about pushing more content, but in reality, and later admitted by HD, it was always about more channels for advertisers. Am is popular with the older segment for talk radio and sports.
  9. If you built the original version from 1949 or early 50's I do believe the stories of potential instability on some builds. In addition, depending on the output transformers used, the cap & resistor across the first stage anode resistor and the feedback cap & resistor, there was not much room for error. Layout and parts placement should be well thought out. The Talbot Wright article helps a bit too. IMO, a robust low impedance power supply will help eliminate a lot of the issues. I really like the Edcor output transformers, especially the 25 watt, 7.6k multi-tap version. I believe this is the closet thing you will get to an original Stancor A-8072. The Edcor is a bit smaller, but it also is using M6, which IMO is a better core material.
  10. Here is a "Williamson" Ultra-Linear amp I built about 25 years ago, but recently transferred the circuitry to new chassis'. The output transformers are Edcor 7.6k to 6 ohm. Power transformers are US military surplus. This particular design is super-stable, no motor-boating or other oscillation issues that some people have reported long ago. I'm also using 1625's since they are less expensive than 807's or KT66's. Originally, these were wired for 807's, but I bought a good stash of 1625's that should last me the rest of my life.
  11. Here is the schematic. No secrets, just a text book design. Although, the 2A3 filaments are using AC, I can barely hear a trace of hum through my LaScala's. I have to stick my head into the horn mouth to hear the faintest sound of hum. True, the 60Hz hum will modulate your music signal, but I can't hear it and I have a pretty good set of ears (i think). I have amps with both AC & DC filaments, but love them all. Attached are some measurements as well.
  12. The "just in time" inventory concept worked surprisingly well when the supply chain was reliable and consistent. Nothing in the world today is reliable or consistent. Depending on the manufacturer, some were quicker to respond than others to change their strategy. JIT is slowly waning for other inventory strategies that work in our new world order. The challenge now is to stock the "right" inventory versus carrying "a lot of inventory". The right inventory is the stuff you know will sell even if you have 6 months of it.
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