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dxho

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    AR speakers:  tinyurl.com/vintageAR

    KLH systems listing:  tinyurl.com/vintageKLH

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  1. Looks like you have a replacement for the early 10" cloth surround woofer. They have 6 holes and an ~11" frame. The later original is a ~10.25" frame and 4 holes.
  2. The date is likely 1968 which correlates fairly closely to that 77xxx serial. The last early AR-2ax was serial 125000 in 1970.
  3. Looks like some helpful information in this thread.
  4. I'm guessing you heard about my database second or third hand. Link to the left. The very earliest (60-61-62 maybe) Model Sixes had surplus oil-in-metal caps. (By the way, I have some ARs with those, and they needed replacement) There is no database specifying when KLH used them to my knowledge. Yours were probably built in 67 or 68, well into the paper cap era. Guaranteed they will need replacement if they're original (Callins with black body and red ends).
  5. Unique picture! Have not encountered this before. The one on the right appears to have the early style glued-in drivers, a la Model One, Two, Three, Four, and Six. These were apparently built as KLH was shifting to removable speakers. The Seventeen came later and never used the glued drivers, but it looks like cabinets were the same size. I would like to also see the rear (terminal plates and serial numbers).
  6. I'd probably go through the front first, just to confirm the crossover is in the original location, or even exists. No telling what other mods have been done to these.
  7. Looks like an AR-2a grill. If it is a 2a, the back has been veneered, and nicely so, it would appear. Have you looked on the bottom to see if the terminals are down there?
  8. dxho

    KLH Model Four

    Ok, yeah. I had the same curiosity about the Fours and did basically the same thing. It even extended to the Model One, a pair of which I did finally buy. However I eventually let the Model Fours go. They just couldn't keep up with the AR-3a.
  9. dxho

    KLH Model Four

    Most of the Model Fours, like the early Model Sixes, had a grill cloth wrapped around the motor board that was glued and screwed into the cabinet. Typical recap operation requires knocking the glue plug under the rear terminal plate out. The switch and most of the caps and buried in it. The motor board can sometimes be knocked forward and out from the back. Or it's often easier to just cut the cloth so the woofer surrounds can be resealed. They are usually dry after ~60 years, costing the system bass response from the resultant air leaks. The factory just screwed in screws and yanked the motor board out. Either way, a new grill board will need to be made. There are many more threads on this repair done to the Sixes; it's the same procedure with the Fours. Both systems sound very much alike. Don't pay a premium when the Sixes are far more readily available.
  10. I converted a pair of 2s to 2xs with 2ax midranges (and panels I built). No crossover change needed.
  11. Yes, your pots are in great shape and might serve you well. There are so many choices on caps. Dayton caps from parts-express.com are a good, middle of the road start. There are probably hundreds of posts on other choices, though, so it's easy to get overwhelmed. If the surrounds are not dried out, they may not need sealer.
  12. According to the label: 5 watts minimum... That's what I'd go by.
  13. https://worldradiohistory.com/. Buyers guides from HiFi Stereo and a couple of others. What more information do you need? The label pretty much covers it. These probably sold in such low numbers that you're not likely to find out much more. Shouldn't take anything exotic or especially powerful to drive these. Here's the buyers guide listing, somewhat different than the label. I'm guessing the buyers guide had the higher crossover point wrong. I see why the label doesn't have the frequency response: ±9 dB? Tuned-port speaker with 10-in woofer. 5-1/4-in midrange. and a 3-in tweeter. Power range 5-70W rms; FR 49-22,000 Hz ±9 dB; sens 90 dB sPL/W/m; imp 8 ohms; crossover points 900 and 1400 Hz. Oak vinyl finish. 27 x 13-1/4 x 10-3/4 in $380/pr
  14. dxho

    KLH Six quick question

    There are two options in re: grill cloth: knock or push the front baffle out of the box from the rear or build molding for the grill cloth after you cut it
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