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Coleman4130

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    Columbus, OH
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    Vintage Audio, Moto, Bicycles...

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  1. Yes it appears I have a hybrid of the two as you have described. With a bit of work last night and this morning I was able to complete the crossover and reassemble the first speaker. Listening results are far from subtle. It's too early still to crank 'em up but listening to a bit of classical this early morning I am pleasantly surprised with the improvement. Thanks to all at classicspeakerpages for the information needed to make this possible! Tan line pictures attached. I didn't take a picture of my crossover but I will of the second, assuming it will be prettier...
  2. Thank for the grill cloth link and advice. Ive had great luck with Howard's Restor-a-finish with light use of OOOO steel wool. One cabinet has been refinished and looks pretty nice, other than sun faded diagonal line across the sides... If I get it buttoned up Sunday I will have 1 re-finished speaker and one original for A/B preview before tackling the second. I pulled the crossover board from completely and replaced it with hard wood so these will not be restorations; I find it so much easier to work out of the speaker box! The 'bypass' is how my research led me to believe one can run the pot at max but keep it in the circuit for resistance. The internals of this pot are clean but it still crackles and cuts out. I do plan to attempt cleaning again and or replacing but for now it is 'bypassed'. Also my hard wood boards are just too thick to thread the nut on the back of the pot. I can drill a recess no prob' but again, another time. I took some pics of the tweeter this morning. It is dated Jan 27 1966. Im not sure how to measure the cone but it can't be bigger than 2.5". When I open up the second speaker I will take a pic of the original crossover. The caps are unlabelled in a wax block with 3 leads; only my research here gave me the 20uf and 24uf values. Thank you again, -John
  3. Thank you for responding! I learned here that these are an older design and am now interested to know/contribute more about their place in AR history. The cabinets have significant (impressive?) sun damage from sitting in the same position for decades but are are solid. The drivers are well preserved. The grill cloths are old and funky but I have removed one from it's frame to attempt cleaning. Ah I see how running the 24 cap in parallel to the woofer simplifies things. 'Bypass to 1' is my understanding of how to bypass the potentiometer. I soldered up the crossover earlier and all seems to check out with the multimeter. I hope to have everything else together for a listen on Sunday. I didn't get a chance to take detailed pics of the tweeter but I will as soon as I can; i am curious to learn more! I refurb one speaker at a time so if all goes well on Sunday Ill open up the second speaker and attach pics of an original crossover too. Thanks again! -John
  4. Hello All, I have a pair of AR4x speakers with the cross-hatched woofers and crossover with 20uf and 24uf capacitors. I now have new caps, hookup wire, hardwood boards, etc. ready to completely rebuild the crossovers. Attached is a pic borrowed from a post by ra.ra. showing the diagram for speakers S/N 386xx, and a pic I drew to help organize the location of everything for my rebuilds. Does anyone see any errors or problems with my diagram? I just want a second opinion before I begin assembly. Thank you! -John
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