MikeD2 Posted October 18, 2019 Report Share Posted October 18, 2019 My initial post was mistakenly appended to an AR-2ax thread, so at @JKent's suggestion, I have started anew. I purchased both my 3a's and 4x's at the same time in 1969 and have begun working on the 4x's for "practice" before tackling the 3a's. So here are some details: These are original purchase speakers, kept in ideal environmental conditions (but not used for a decade or so) and have the AR-4x name plates and serial numbers (see below) so I'm sure they are 4x's (after assuming they were 2ax's in my original comment, having not done my research OR reading the label on the back.) ? I have confirmed from the photos in @Coleman4130's thread "AR4x Crossover Rebuild Check" by @ra.ra(thanks, guys for doing all that work!) that I have the later 2-1/2" tweeters and a single 20 mfd capacitor. (Can't read the numbers with the induction coil strapped on top, but it has 2 wires.) This should be consistent with the date. I have ordered the dope for the cloth surrounds (which look very good) and the 20 mfd capacitor and the 8-ohm 15W L-pads. I'm a bit puzzled by the 25 ohm resistor. I do not find any resistor on the crossover board. My board looks exactly like the photo by @rebelliondog. Other posts concerning the 4x's are saying no resistor is needed between terminals on the L-Pad for this model. With my 1969 speakers, is this the case? Confusing because some of these threads begin crossing over to other models and the trail becomes less clear. And forgive me for being a total dunce when it comes to electronics. I'm a chemist -- we don't like sparks. Cabinets and cloth are in excellent condition and will not receive any amateurish attempts to "fix" what ain't broke. Serial numbers: FX250128 and FX246425 I find this a bit curious because the span between the two numbers is very large. In addition, the FX250128 has the "FX" stamped along with the number, while the FX246425 has a hand-written "FX" before the stamped serial number. Perhaps a rebuild of a defective original, or just a change in manufacture labeling. Interesting. I have not opened the FX246425 up yet so I may find something different in there. I appreciate any assistance you can give regarding the 25 ohm resistor (or lack thereof.) I can send photos if necessary. I cannot read the stamping on the back of the woofer. Quote Link to comment Share on other sites More sharing options...
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