donsof

Hi all, This is an old thread, but I waited long enough and found an early AR-1 crossover someone removed from a speaker. I thought I would share the pictures as its very hard to find someone who has broken one out, and the pics show its not easy to get these out. https://jpegbay.com/gallery/008383189-1.html#1

You guys are awesome, and its great how that one seller provided me with a look at the crossover. Though I wish I could see around the insulation. That ebay seller parted the pair out for appx 3900$ AR serial numbers were 14586 11162 both mahogany with potentiometers Also I noticed that his woofers had red and blue wires, that were unsoldered or clipped from some point? He personally sent me the 2 pictures of the crossover, they weren't in the listing. I think the first version of the crossover would suit me better. I don't like pots, if I have to go through hell to service them. If anyone has pictures (of the insides) of the early strapped version, please share. I learned about the east coast vs west coast sound rivalry a few years ago, and always wanted to see what the AR fuss is all about. Its my first pair. I understand there may be some shortcomings to the original AR, so I will just be happy to listen to it properly, and at its best. I have been working on JBL projects for the last several years, and loving my JBL C36 Bass Reflex speakers. This week I stumbled across a JBL trend from 2006 called the econo-wave. It takes a JBL C36 from the 1950s - 1970s, seal the cabinet to be air suspension, and use a 12inch 123A-1 woofer, compression driver with dispersion wave horn, 1200 Hz network, and was a project "Zilch" worked on. I am very happy with the west coast sound in a 2 way, and love to horse around with all the old stuff. I do like looking and working on the JBL stuff, its easier to get apart! thanks

Here is the best I have so far, inside this AR-1 unit that just sold as a parts unit on ebay, there were some crossover parts visible. Can you tell me what are the parts in the metal cases labelled #10 - #11 - #12, and there seems to be something in tar under the masonite squares labelled BLK 1 and BLK 2? I will put an A-B-C- code to each part so we might talk about them easier. Input 1 is +IN #1 terminal and its hidden Terminal 2 is down and hidden by insulation Input #3 is -3 IN and visible The black pucks are the inductors? .4MH maybe? or are the inductors next to the can at the bottom? I assume the #11 can is the 24MFD capacitor? see items 10-11-12 I think the HF wires are yellow and green? Can you help fill in the blanks, and the pot may have the rear cap missing? This is the only crossover picture I have. pictures here https://jpegbay.com/gallery/007555853-.html#1

Thanks for the help... this site has caused me to use up 20 or more hours of reading! Its fun researching when you stumble into the estate sale find of the year. The AR's were found in a modest home with a decent looking EICO ST-70 tube amp, which is going into resto as well. Hopefully these speakers won't need much. So I have been wanting to find out what the altec 755 is all about, and initially, my first impression is this set runs good, and is one of those pairs that would be considered on the high end of the value range. Taking off the grille shouldn't devalue them, I wish the AR's were more service friendly. I tried uploading pictures, but this site wouldn't allow my uploads for some reason, so I used the jpegbay link in the first post. It works great. I will get one of my 5 tube amps rebuilt and running this winter, with 4 ohm loading available, thanks for the tip on that 8 ohm mystery. Both drivers are 4 ohm models in this piece? I know the Altec is supposed to be 4 ohm anyway? I understand there is one cap in the crossover, and its oil filled. I read someone say don't worry about that cap. I have been looking everywhere for pictures of this crossover, to no avail. I do research things pretty deep before digging inside, so thanks for the words of caution. I hope someone has a picture pile of this crossover they can share. I saw a set get parted on ebay that brought big money recently, but they didn't show the crossover very well. thanks Don

Hi all I have been looking for info and how to approach using these speakers. They are super nice and very original, with no evidence of ever being tampered with. Does anyone have internal pictures of the crossover parts, removed or still in place, inside this pot generation model? I did find the confusing schematic for them. I think I could live with the HF section at full gain if its possible to bypass the pot, without pulling driver? I cranked the pots up all the way to find a spot with little crackle. I am considering pulling the grilles and 1 driver to apply deoxit to the pots. If anyone has a slick way to break the glue, let me know. It looks like I should peel the grille cloth, and work a thin knife under the 6 glue dots, holding on the masonite. Even if I later sell these, I think everyone will want to see the cones, so its not a bad thing. I plan to use velcro when replacing the covers. The speakers sound ok, but the pots are really needing help. Has anyone ever thought of drilling a hole, and filling it later to allow a deoxit tube? If I am reading this right, I need to pull the 1-2 jumper to make these 8 ohm, as modern solid state amps are mostly 8 ohm ready, and a 4 load is not good with most solid state gear? Does that sound right? I am reading the label as saying these are 4 ohm speakers with the 1-2 jumper attached. thanks Don (a first timer here) pictures here https://jpegbay.com/gallery/007555295-.html#1