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Thread: JBL/UREI 6230 transformer hum problem

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  1. #1
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    JBL/UREI 6230 transformer hum problem

    I scored what seemed to be a good deal on ebay for this amp. To my dismay when I hooked it up there was a loud distracting hum from the transformer, which isn't acceptable in my studio environment. I know it's the transformer because it happens when only the power is hooked up, and I can hear it emanating and vibrating from the large transformer. I tried tightening the screws, no help. I also tried some rubber washers on both ends, didn't seem to help much. I understand with old transformers this just happens, as is the nature of transformers to vibrate. Is it possible to replace the transformer with something stock/cheap? I might try setting the transformer loose on a vibration absorbing pad of some sort so it doesn't resonate through the chasis, but I have a feeling there is still going to be noticeable hum.

    Sometimes I think I waste my money trying to get bargins and they end up needing more work than they are worth... and I should have just bought something new. Thanks for any ideas/advice...

  2. #2
    JBL 4645
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    I think its criminal to auction off items on eBay when the sealer knows for well the item is buggered up.

    How much did you pay this person for the JBL Urei6230?

  3. #3
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    $145 with shipping, so it was cheap. I was originally looking for a crown d-75 or d-45, but I spotted this "deal". I do like the amp, it's very powerful for only listed rating of 75watt/8ohms.

  4. #4
    Moderator hjames's Avatar
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    Quote Originally Posted by jamesdstark View Post
    $145 with shipping, so it was cheap. I was originally looking for a crown d-75 or d-45, but I spotted this "deal". I do like the amp, it's very powerful for only listed rating of 75watt/8ohms.
    Got one myself, like it a lot ... shipped price seems fair ...
    2ch: WiiM Pro; Topping E30 II DAC; Oppo, Acurus RL-11, Acurus A200, JBL Dynamics Project - Offline: L212-TwinStack, VonSchweikert VR-4
    7: TIVO, Oppo BDP103D, B&K, 2pr UREI 809A, TF600, JBL B460

  5. #5
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    It could be just a loose lamination stack. The transformer can be disassembled and rebuilt. It is not all bad.

    Allan.

  6. #6
    JBL 4645
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    Quote Originally Posted by hjames View Post
    Got one myself, like it a lot ... shipped price seems fair ...
    Unlike that other one you brought was it the 6260 or 6290? That looked like dog was chewing on the binding posts.

    Quote Originally Posted by Allanvh5150 View Post
    It could be just a loose lamination stack. The transformer can be disassembled and rebuilt. It is not all bad.

    Allan.
    LOL I think eBay is only good for spare parts. LOL yeah lets make Frankenstein JBL Urei 6230 from spare parts shall we. Only you have to bid for silly over the top prices. LOL

  7. #7
    Junior Member tyler477's Avatar
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    yup, with repair work (bout 100 bucks with parts) you got a good price at 245. I've heard good things about using this unit bridged into a small bass cab.
    Was the unit advertised as funtioning? if so give him negative!

  8. #8
    Moderator hjames's Avatar
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    Quote Originally Posted by JBL 4645 View Post
    Unlike that other one you brought was it the 6260 or 6290? That looked like dog was chewing on the binding posts.



    LOL I think eBay is only good for spare parts. LOL yeah lets make Frankenstein JBL Urei 6230 from spare parts shall we. Only you have to bid for silly over the top prices. LOL
    Okay Ash - another misinformed opinion of yours, right!
    FYI - I've done close to 300 deals on ebay - had maybe 3 or 4 bad ones, and I got reimbursed for all the baddies ... no money lost, just aggravation.

    The badly packed vintage Yamaha receiver? Full refund.
    That 6260 that was burned up? Credit card chargeback - I got fully refunded.
    The scraped up Yamaha poweramp - refund less 1 way shipping ...

    Stay away if you like, more deals for the rest of us who know how to take precautions!
    2ch: WiiM Pro; Topping E30 II DAC; Oppo, Acurus RL-11, Acurus A200, JBL Dynamics Project - Offline: L212-TwinStack, VonSchweikert VR-4
    7: TIVO, Oppo BDP103D, B&K, 2pr UREI 809A, TF600, JBL B460

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