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Thread: Help With JBL 6290 AMP Knobs

  1. #1
    Senior Member gsb001's Avatar
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    Help With JBL 6290 AMP Knobs

    Hi Everyone,
    I'm looking for part numbers / sources for one pair of knobs for a JBL 6290 amp.

    I found the Security Cover Caps: part # 6200SC. No luck on the knobs.

    Thanks
    Steve

  2. #2
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    Can't find anything about part numbers in either the 6290 owners manual or the current JBL parts list but not surprising as this is a 20 y/o amp.

    Best to call JBL Pro parts department and see if they have either the knob or the security covers. If not, then take a pic of the exposed pot control shaft and we'll have to see if something could be done.

    Also might look for a parts unit, they sometimes show up. Good Luck!
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  3. #3
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    Post 6290 Volume knobs

    Hello to all,
    I do own 3 JBL 6290 power amplifiers all with the security covers in place.
    The volume knobs were not included in the package when i bought them (second hand).
    A few weeks ago i raised the volume of one channel with the amp still on and touched by accident the PCB with one finger:the 90vdc rail voltage is not pleasant to feel!!
    So if someone can get in touch with a supplier of those volume knobs please drop me a line cause i'm looking for them too.
    Thanks in advance.
    feel free to mail: jorre@skynet.be

  4. #4
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    Well, I just checked with JBL Pro and both the knobs and security covers are No Longer Available (NLA). Pretty much expected this as the amps are almost 2 decades old.

    I'll have to pull the knobs off of mine and see exactly what the attenuator shaft/spline looks like (diameter, length, and configuration) and the diameter of the opening. With that, we can then search for an appropriate potential replacement.

    Bart
    When faced with another JBL find, Good mech986 says , JBL Fan mech986 says

  5. #5
    Senior Member gsb001's Avatar
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    Bart,
    Thanks for the help -
    Steve

  6. #6
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    OK here's some pics of the knobs off my 6260 which are the same as the 6290.

    overall diameter 1 1/8"
    Total depth 1 1/4"
    Shaft spline depth 3/8"
    Shaft diameter 1/4" splined

    Due to the knob being a hollow finger hold type, a deeper knob with knurling may work or a knob with a bar type control surface may work. Plastic probably would be better than metal since there may be conductive surfaces in the recessed area this works in.
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  7. #7
    Senior Member gsb001's Avatar
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    Hi Bart - thanks so much for the details. Very nice of you to take the time.
    Steve

  8. #8
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    Glad to help, sorry that there is not an easy solution yet.
    When faced with another JBL find, Good mech986 says , JBL Fan mech986 says

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