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  1. Replies
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    33,372

    See the links above.

    See the links above.
  2. The zeners are suspect. Check them out of circuit...

    The zeners are suspect. Check them out of circuit and repost. FYI, you can just unsolder one leg of each and test. Also, there are other things in parallel with the zeners, so it could be something...
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    I believe there are different revisions of that...

    I believe there are different revisions of that amp. My guess is that your schematic is not the correct revision. Is there something you're trying to fix? "If it ain't broke, don't fix it."
  4. I'm wondering if you're losing circuit ground....

    I'm wondering if you're losing circuit ground. Check ground connections. What does the filament winding AC do? Is it staying constant across P15 and P16?
  5. First, -105 is way to much negative voltage....

    First, -105 is way to much negative voltage. Second, what does that statement mean? -105 is intermittent, then it settles to what? Or, bias is completely lost? Or, other? Can you better explain the...
  6. 1) I'd first try a known good speaker on the...

    1) I'd first try a known good speaker on the right channel or swap speakers and see if the problem follows the amp or speaker.
    2) Is there DC on the right output? Unhook the speaker and measure. If...
  7. It's best to include a schematic or schematic...

    It's best to include a schematic or schematic link in your post, if you want quick and accurate responses. Especially in the case of Roland, who may have several different versions/schematics for the...
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    I would start by gluing the broken board back...

    I would start by gluing the broken board back together and rebuilding/repairing any broken traces.
  9. Replies
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    Also, check the resistance of the tank input. You...

    Also, check the resistance of the tank input. You may have a broken transducer wire or open transducer. FWIW, I check them at the cable end that plugs into the amp first. That checks both cable and...
  10. ^^^^^^ That! Is your cell phone or a computer...

    ^^^^^^ That! Is your cell phone or a computer nearby? Any lighting with ballasts? As g1 suggests, try the amp in another location.
  11. Replies
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    Along with various glue types and if there's...

    Along with various glue types and if there's enough material to work with, I'll often use my solder iron to melt a plastic crack back together. It smells, but has been effective.
  12. The only thing I noticed is that the pics in my...

    The only thing I noticed is that the pics in my link show a D shaft pot. Your eBay link does not. They are round. Your existing knobs will not fit. I'm not sure if this helps, but Mouser has a closer...
  13. The service manual on the linked page I posted...

    The service manual on the linked page I posted says VR 1-9 are all the same pots- RK09L1140C1T 10KB.

    Edit: Also, consider updating your profile with a location. It's hard for any of us to...
  14. Replies
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    Yep,...... beast is an apt description! You can...

    Yep,...... beast is an apt description! You can skip the gym for a while. ;)
  15. Well, what'da know. Here's a page with a service...

    Well, what'da know. Here's a page with a service manual download and instructions for replacing the pots!

    https://www.tekyinblack.com/music/roland-cube-100-bass-repair/
  16. Do you have and can you upload a schematic? Are...

    Do you have and can you upload a schematic? Are you sure the fx control devices aren't rotary encoders and not pots?
  17. Did you install the new jack? If not and you're...

    Did you install the new jack? If not and you're trying to run off battery, you'll have to bridge the two traces where the jack switches them together.
  18. Replies
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    Your supply is probably closer to this one,...

    Your supply is probably closer to this one, although they might use "close enough" cap values and parallel or series caps to get the filtering needed and meet voltage requirements. Also notice the...
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    The two 100K sound like a second totem pole...

    The two 100K sound like a second totem pole arrangement. They are just trying to use all of the sections of the can caps to best advantage considering available voltage rating and capacitance. You/We...
  20. Thread: Ampeg J12-T

    by The Dude
    Replies
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    152

    The pot should be this one: ...

    The pot should be this one:

    https://www.fullcompass.com/prod/285243-ampeg-70-105-22-1m-log270-comp-pot-for-svt4pro
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    ^^^^That. If you zoom the pic, it looks like...

    ^^^^That. If you zoom the pic, it looks like arcing to the chassis. I'm not sure the cap is even bad or in need of replacement. It looks like connections are just too close (maybe even touching) to...
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    Can you upload a picture? It can probably be...

    Can you upload a picture? It can probably be repaired by bridging the trace with wire.
  23. Replies
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    I'm sure I'm not the only one who's done this,...

    I'm sure I'm not the only one who's done this, but here ya go. I used to leave the last channel unused on the console, when possible. If the club owner would say it's too loud, I'd grab that fader...
  24. Yes, typo. Thanks for the catch. I'll try to...

    Yes, typo. Thanks for the catch. I'll try to correct the post.
  25. Replies
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    ^^^^ Agree. Fix it first, then see if it needs...

    ^^^^ Agree. Fix it first, then see if it needs ground modifications.
  26. From the schematic it appears tip is positive and...

    From the schematic it appears tip is positive and ground is switched. So, one of the solder pads that went to the jack will go to battery positive. The other two will need to be connected together...
  27. Caveat: Making some assumptions, so with a grain...

    Caveat: Making some assumptions, so with a grain of salt......

    Check it with a meter.

    Assuming chassis is ground, does the chassis have continuity with battery negative? If not, they are...
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    That's crazy and nearing the cost of the value of...

    That's crazy and nearing the cost of the value of the amp. I certainly wouldn't do it, but I don't have the money to burn.
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