roundhome Posted January 25, 2007 Report Share Posted January 25, 2007 I have a pair of AR3's that belong to a freind.The weird part is that some one bypast the pots and also took out the coil and cap. it still has the 6 and 24 cap with the coil on top but the others are gone. his pots are shot no fix holes in the pickup contacts. does any one know the value of the other coil and does any one have a pair to spair.not worried about the cap. putting in all new ones any way .Thanks Jim Link to comment Share on other sites More sharing options...
onplane Posted January 25, 2007 Report Share Posted January 25, 2007 >I have a pair of AR3's that belong to a freind.>The weird part is that some one bypast the pots and also took>out the coil and cap. it still has the 6 and 24 cap with the>coil on top but the others are gone. his pots are shot no fix>holes in the pickup contacts. does any one know the value of>the other coil and does any one have a pair to spair.not>worried about the cap. putting in all new ones any way .>Thanks >JimHi, Jim!Don't know how to say this, but I don't think all versions of the AR-3 came from the factory with that cap and coil. When I look at the original xover drawing, it shows a notation dated May 13, 1970 for the ADDITION of that cap and coil.The original drawing was dated June 12, 1959.Regards,Jerry Link to comment Share on other sites More sharing options...
roundhome Posted January 25, 2007 Author Report Share Posted January 25, 2007 this might be. there are no holes for the other coil and cap the numbers on these are 39170, and 39177.so there must have been a reason to add them in were they for the mids these have one bad mid I have a spare for it they are getting hard to find. Link to comment Share on other sites More sharing options...
onplane Posted January 25, 2007 Report Share Posted January 25, 2007 Jim, I don't know how accurate this is, but one notation I read said that the cap and coil were added to the AR-3 to "protect the mid driver".I really don’t know, but my guess is the mid driver might get too hot at high volume levels when there is a preponderance of lower mid-range frequencies. That coil will appear as less than 1 ohms resistance under 500Hz while that cap will be over 10 ohms. Net result will be a significant reduction in current flowing through the mid driver for frequencies under 500Hz. From what I can tell the cap added is 6mF and the coil is 0.42mH Hope this helps ...Regards,Jerry Link to comment Share on other sites More sharing options...
Guest MarkAnderson Posted January 26, 2007 Report Share Posted January 26, 2007 >...it still has the 6 and 24 cap with the>coil on top...That's all that's in my 3's, as well. Link to comment Share on other sites More sharing options...
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