Al W Posted January 13, 2020 Report Share Posted January 13, 2020 Hello, My first post. I've been enjoying the forum and wealth of information while planning the rebuild of AR-3s which were my fathers. I hope to give them to my son if I'm successful at the rebuild (S/Ns C66552/C66553). I though I had all the information I needed already posted or included in the well written AR-3a rebuild article. However, on opening the units I find the crossover network with a capacitor value which is different than in the AR-3 schematic AR3-0305-2. This is the added parallel cap for the mid range which is given as 6 mfd. A 50 mfd cap is installed. So what's installed is a 50 mfd in parallel with the 24 mfd cap from the dual capacitor. Furthermore, the AR-3 crossover reference (from library) indicates the added parallel cap was introduced starting with S/N C70229, after my S/Ns. I understand that sometimes during builds units are substituted based on availability and wonder if the mid range driver is different such that a different cap value is needed. Can anyone shed light on this? My rebuild plan is to clean the pots (replace if needed), install new capacitors (extensive forum discussion on selection to keep my confused ;-] ), and hope the Hi and Mid drivers are still OK. I'll save the woofer issue for some other time. Thanks all and happy listening. Al Quote Link to comment Share on other sites More sharing options...
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