Shacky Posted November 16, 2008 Report Share Posted November 16, 2008 Finally starting digging into my recently acquired AR 3a. Serial numbers 53022 and 54211. Purchased from original owner in Rochester NY with guidance from Onplane (Jerry). Original owner said he purchased them while in the service in Hawaii in the '70's. They are in great shape. While I have them apart I'm going to go through them with new Caps, possibly new pots, re-foam woofers and general touch up.First thing I notice is these are later serial numbers with earlier caps. I know to expect anything from AR. The tweeter cap on one is straight 6 uF and the other is a dual 6/2 Must have been a special on the duals Geez these woofers are built like a tank. I think you could set up an MRI with these magnets I see the restoration guide recommends placing small resistors in series with newer caps to compensate for lower ESR than originals. Has anybody actually tried this? I'm using Dayton 100 + 50, 50, and Solen 5.9 (thinking of adding bypass cap - some russian military grade 0.047 I picked up and had great success with JBL L36 resto). I have a set of new Ohmite pots I've been saving. But will check out the original pots first to see what shape they are in. Want to wrap this up in next couple of days. Any advice or tips are welcomed.Some pics of the speakers and crossovers: Link to comment Share on other sites More sharing options...
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