Jump to content
The Classic Speaker Pages Discussion Forums

RoyC

Members
  • Content Count

    2,486
  • Joined

  • Last visited

Community Reputation

0 Neutral

About RoyC

  • Rank
    Advanced Member

Contact Methods

  • Website URL
    http://
  • ICQ
    0
  • Yahoo
    rjwine@yahoo.com

Profile Information

  • Gender
    Male
  • Location
    Latham, NY

Recent Profile Visitors

16,455 profile views
  1. RoyC

    12.5 question

    Chris, Based on my experience with KLH speakers you are chasing a non-existent (and unattainable) degree of precision. There are simply no standards or specs for you to use as a guide...and I seriously doubt KLH publicly shared various changes in materials and manufacturing methods as they evolved. In fact, it is likely the mids will not benefit from any re-treatment at all, regardless of the apparent differences. Roy
  2. Just replied to your PM. Roy
  3. jomede, Coincidentally, I plan to be in your neighborhood the weekend of March 14th. If you don't mind holding off on the repairs (including the re-foam) I'm sure I can be of assistance. Send me a PM if you would like to discuss details of a possible "house call". Roy
  4. I seem to recall the banana plugs are more or less integral with the circuit board. I never had to replace one. It won't be an easy repair. Roy
  5. The AR-3a Limited (circa 1990) had a vinyl veneer finish, but I have only seen the faux walnut cabinet.
  6. Hi Pete, The schematic Kent posted above is for the AR-3a Limited (circa 1990), not the 3a Improved of the mid 70's. The 3a Improved's tweeter cap and coil is 10uf and .11mh, just like the AR-11...but paired with the old 3a tweeter. The 3a Limited used an AR-11 tweeter along with a 4uf cap/.16mh parallel coil combo vs the AR-11's 10uf cap/.11mh. The 3a Improved was a bit of an aberration. I still believe the Improved was really not much of an improvement. Perhaps it was a way to unload a surplus of Euro cabinets before the introduction of the AR-11/10pi models. 😏 Out of curiosity I had acquired a pair of original 3a Limited boards in the early 90's when Parts Express was selling "original AR-3a crossover boards" as "buyouts". Since these printed circuit boards were set up with the same configuration as the original 3a crossover, and not knowing what they were originally used for, I used them for much experimentation for over 10 years years until sending the remnants of one to John O'Hanlon. (Minh Luong, another of our 3a restoration guide brethren, had identified the curious 3a board's original use by that time.) Using the original board as a guide, John produced 4 very nice AR-3a Limited printed circuit boards and sent two to me. My new O'Hanlon/3a Limited crossovers were placed in Euro/3a Improved cabinets and John's were used in original US 3a cabinets, both with Tonegen AR-11 replacement tweeters. Imo, the AR-3a Limited is the best of the bunch. Roy
  7. They both work well. I've been combining orders with Larry Lagace/"Vintage AR" who orders the 1" version in large quantities. When properly installed it is sometimes more convenient to route certain crossover wires under the L-pad body. Roy
  8. Jim, The ADS 1290 is a larger and more sophisticated speaker system than the AR-2ax. I doubt anyone (myself included) familiar with both of these speaker systems would suggest the 2ax over the 1290 for many reasons related to sound...and no 2ax tweeter of any kind is likely to change that general opinion. It may be helpful to know what you don't like about the 1290 to determine what you are hoping the 2ax could improve for you. In any case, the "attenuators" are absolutely critical, especially if you are trying to calm down the midrange frequencies. I see Kent posted while I was responding. What he said as well. Roy
  9. What does "yes, mainly" mean? What exactly is a "Roy C modded" AR speaker? Whatever it is, I'm not sure how you expect to acquire an "outside" opinion from within the forum. Roy
  10. A .05mh coil will work fine, and is readily available. Roy
  11. The rattle is a common issue with these woofers, and is almost always caused by loose masonite rings under the surround and/or the spider. see attached photo. Roy
  12. Probably not, Steve...but the drivers installed in the Improved's Euro 3a cabinet were the same as the original 3a. The primary differences were changes in the midrange circuit of the crossover and the addition of a parallel inductor on the original 3a tweeter. The similar AR-11 replaced the original 3a type tweeter with the new cloth dome tweeter and, interestingly, went back to a midrange crossover more like the original 3a than the 3a Improved. From a technical point of view both models essentially have 3a crossovers altered to accommodate switches instead of variable level controls. The "improvements" were the result of consistent and more robust level controls, better power handling due to the addition of a parallel inductor for the tweeters, and cabinets with fewer diffraction issues. It should be noted that the last iteration of the 3a using these drivers, called the "AR-3a Limited", was equipped with Tonegen made AR-11 replacement drivers, and essentially went back to the original 3a crossover. The primary difference compared to the original 3a was the retention of the parallel inductor to better protect the tweeter, and slight crossover changes to accommodate the differences in the electrical characteristics of 8 ohm L-pads vs the original potentiometers. This iteration of the 3a is my personal preference, as the variable level controls provide a greater number of options compared to 3 position switches...or no level controls at all (ie AR-58). Roy
  13. AR-2 pots are not immune to issues affecting other AR level controls. The primary difference is only 2 of the 3 terminals (#1 and "B") are used, which determine the amount of variable resistance placed in series with the driver(s). The parallel leg of the AR-2 pot is not used, leaving pot terminal #2 unconnected. Terminals #2 and #3 of an 8 ohm L-pad can be used, leaving L-pad terminal #1 unconnected, but the amount of attenuation will be limited to 8 ohms (more than enough for most people) instead of 15 ohms. The oil filled capacitors in the photos above are likely to be OK. I would leave them as is and deal with the pots. Roy
  14. Nope. Wharfdale speakers are still manufactured by the original company in Britain, and JBL is now a subsidiary of Samsung. AR as we know it is long gone. Roy
  15. I believe I saw a few original AR-5 badges last time I was in Larry/"Vintage_AR's" shop. His Ebay listing is for the plastic type (despite the ambiguous description). The buyer should be prepared to pay a hefty premium if he has any original badges to sell. Larry is unavailable until March. Ebay seller "burtnbec" is selling the print-on-aluminum type for a relatively reasonable price compared to the above listing. It is much the same as the non-engraved badge of the very late production AR-2ax. Roy
×
×
  • Create New...