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MoonBassAlpha

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Posts posted by MoonBassAlpha

  1. There must be some BassChat funksters in Glasgow, surely?
    Why doesn't someone pm the guy and offer to look at his gear and sound for him?
    I would if he was in my neck of the woods. C'mon folks!

    Oh yeah, and some links to clips of what you're striving towards sound-wise would be a big help too, OP.

  2. Resolved today!
    I replaced the 2 transistors on the input (long tailed pair), and the one following them (all smd) and all seems good.
    The noise briefly went after I reflowed one of them, but came back after a few minutes, so I suspected it was in an odd failure mode.

    I have to big up the service response from Laney here.
    I asked for the circuits for this amp via email and got them back in 4 minutes! That takes some beating, no?
    cheers
    Jules

  3. [quote name='zigmondo' post='1040660' date='Nov 29 2010, 12:26 AM']Assuming it's not a valve jobby? Valves would be the first thing to check if so(eg, any gone microphonic?)..
    Perhaps the popping might suggest capacitor as above?
    Power supply faulty? (given the constant sound you describe)[/quote]
    It's transistor, circa '94, the power board has some surface mount stuff on the underside too.

  4. [quote name='Mr. Foxen' post='1040605' date='Nov 28 2010, 11:32 PM']Dying filter caps did that to my Carlsbro, replacing them sorted it, fair bit older than that though.[/quote]
    It may still be that, but I'm not convinced(made in '94), as it went almost to nothing when the input to the power stage was grounded.
    I think it may be the input transistor (part of a long-tailed pair) failing softly.
    It's a little surface mount thing, and thought I'd fixed it when I reflowed it, It was perfect for a couple of minutes, then it came back again.
    Then I reflowed it again, this time forgetting to turn the power off. New transistor should arrive tomorrow!!!

  5. This thread is copied from the Repairs and Technical Issues section:

    Hi folks
    I'm repairing a Laney BC30 combo.
    It reproduces the input signal fine, but there is a constant volume static-like sound coming out of it all the time, punctuated fairly frequently by louder pops.
    My first thought was a dry joint somewhere so I went all over the usual suspects (output transistors, big caps, bridge rectifier) with an iron to reflow them - nothing doing. I removed the preamp input and bypassed the send-return with a patch lead - still the same.
    I'm now thinking it could be an odd failure mode with a cap across the supply rails, or a protection diode across the rails going "soft".
    There isn't an undue amount of mains hum either.
    Any comments?
    Cheers
    Jules

  6. Hi folks
    I'm repairing a Laney BC30 combo.
    It reproduces the input signal fine, but there is a constant volume static-like sound coming out of it all the time, punctuated fairly frequently by louder pops.
    My first thought was a dry joint somewhere so I went all over the usual suspects (output transistors, big caps, bridge rectifier) with an iron to reflow them - nothing doing. I removed the preamp input and bypassed the send-return with a patch lead - still the same.
    I'm now thinking it could be an odd failure mode with a cap across the supply rails, or a protection diode across the rails going "soft".
    There isn't an undue amount of mains hum either.
    Any comments?
    Cheers
    Jules

  7. I know we're all used to it as it is so familiar, but the scratch plate on Rics really irks me - It's ugly utilitarian shape and cheap (looking) plastic. The knobs they use are amongst my least favourite too.
    I think the rest of it looks super cool though, but I've never played one. People get nice sounds out of them too.

  8. [quote name='Mr. Foxen' post='1028159' date='Nov 18 2010, 04:41 PM']The only bit in a cab that can be damaged by amp clipping is the tweeter/crossover, because they see the flat bit as high frequency, and they can't cope with that sort of power level.[/quote]

    Sorry, you're completely wrong there, you CAN blow the bass driver with clipping. My friend was enjoying playing with feedback into his Trace 1x15 quite loud and it sounded great, for a while....! Burned out voice coil.
    Of course the tweeter/xover can also go for a burton, if fitted!

  9. [quote name='goblin' post='1030009' date='Nov 19 2010, 11:45 PM']awesome, cheers for that :)[/quote]
    No probs. I put it on the scales an it weighs 8lbs exactly, I know folks like to know these things! I think it has some kind of water proof, or resistant lining too - "RokTex, our patented water-resistant material" apparently...

  10. It's a good job I saw this - she hasn't wrapped it up yet!

    [attachment=64386:P1010698.JPG]
    [attachment=64387:P1010699.JPG]
    [attachment=64389:P1010700.JPG]
    [attachment=64390:P1010703.JPG]
    [attachment=64388:P1010701.JPG]

    Sorry bout the images, poor light 'n all and a real hurry - gig tonight!, but should give you the idea.
    Cheers
    Jules

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