Polk RTA 12C Cap Rebuild

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wattcraver
wattcraver Posts: 5
edited November 2008 in Vintage Speakers
Hello everyone.Just finished these.I bought them in 1987.Fried the drivers and replaced them with the wrong type.Had them mothballed till now. Now looking for origonal repacements before I re-Fire them up.I believe the 4 0hm Mw 6503 were the origonals? The Solen caps should make them sing.
Post edited by wattcraver on
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  • george daniel
    george daniel Posts: 12,096
    edited November 2008
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    nice work :)
    JC approves....he told me so. (F-1 nut)
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  • ben62670
    ben62670 Posts: 15,969
    edited November 2008
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    Looks very nice. Replace those resistors, and you are good.
    Welcome to Club Polk
    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • george daniel
    george daniel Posts: 12,096
    edited November 2008
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    good eye Ben,,
    JC approves....he told me so. (F-1 nut)
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  • wattcraver
    wattcraver Posts: 5
    edited November 2008
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    OK thanks Ben.Bypass the poly switch too right?
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  • ben62670
    ben62670 Posts: 15,969
    edited November 2008
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    wattcraver wrote: »
    OK thanks Ben.Bypass the poly switch too right?

    It is a personal preference, but most agree with bypassing(with a jumper) the Poly switch. I also can't tell from the pictures. Do you have some small purplish brown caps on the boards? There should be 2 on each board rated at 750pf. These can just be removed.

    Edit: Here is a link to the pic. The small circled cap between the big cap, and the inductor is a 750pf cap.
    attachment.php?attachmentid=36748&d=1227899142
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • wattcraver
    wattcraver Posts: 5
    edited November 2008
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    are there the ones? On C2 and C5 .Connect their terminals?
    Thanks Steve
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  • jon s
    jon s Posts: 905
    edited November 2008
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    they be the ones... I just cut them off on my RTA-12Cs... made the speaker sound smoother
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  • wattcraver
    wattcraver Posts: 5
    edited November 2008
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    thanks Ben. connect the wires together right?
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  • ben62670
    ben62670 Posts: 15,969
    edited November 2008
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    just remove them;)
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • wattcraver
    wattcraver Posts: 5
    edited November 2008
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    a photo of the purpley thingy.
    Thanks for your input Ben
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  • george daniel
    george daniel Posts: 12,096
    edited November 2008
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    Guy's it's late (for me) and I'm kinda tired,, but the "thingy" in the above picture is a "mica" isn't it.. the blue thingy in a few pic's before is the poly,,,right?
    JC approves....he told me so. (F-1 nut)
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  • george daniel
    george daniel Posts: 12,096
    edited November 2008
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    okay,, I went back and read the entire thread,, the poly's you can "jump",, but the mica's can just be removed,, no jumper? Is that correct? Thanks in advance.
    JC approves....he told me so. (F-1 nut)
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  • george daniel
    george daniel Posts: 12,096
    edited November 2008
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    okay,, got it,, would that hold true on all x-overs that use the mica? Reason I ask,is I'm going to re-visit some 2.3 tl x-vers next week. Thanks--george
    JC approves....he told me so. (F-1 nut)
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  • MFattal
    MFattal Posts: 25
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    @wattcraver could you kindly list all the components you used so that I can also rebuild my crossovers? I'm clueless about the parts and will order them to have a technician help me solder them. Thank you kindly.
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