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Thread: Capacitor Guts or Glue?

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    Capacitor Guts or Glue?

    Greetings. I am about to start on a Tweed Tone 20 amp, a Chinese made amp that looks very similar to a Blues Jr, but I think it may sound a bit better courtesy of its Celestion speaker. Like the BJr, the main PCB is mounted vertically. When I looked at the main filter caps there was this solidified purply-black coloured hard stuff that was flowing down the PCB from the caps. Have you ever seen anything like this? Is it just sloppy gluing at the factory ... or capacitor guts that have oozed out of the bottom of these radial caps.

    Click image for larger version. 

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    Glue. Radicals vent from the top.

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    Supporting Member Jazz P Bass's Avatar
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    That is really sloppy glue.
    Whatever the formula, I would scrape it away from the resistors as it 'may' become conductive someday.

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    And just for the future, you'll know if it's cap guts. They stink to high heaven if they're fresh. And if not, it's usually seen as a light-colored powder or crust that gets left behind when the electrolyte dries away. If they explode there'll be bits or rolls of aluminum foil in the immediate vicinity.

    And yeah, I'd hesitate to use anything colored black on a circuit board... I'm with Mr. Bass on the "clean up what you can" thing.

    Justin

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    "Wow it's red! That doesn't look like the standard Marshall red. It's more like hooker lipstick/clown nose/poodle pecker red." - Chuck H. -
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    Quote Originally Posted by xtian View Post
    Radicals vent from the top.
    I've always wondered where these so-called 'free radicals' come from.

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    Itís weird for the gloop used to mechanically secure parts to the board to be 2 tone.

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    Supporting Member Randall's Avatar
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    I think that is just the light playing tricks.

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    It's weird, because it WAS working fine.....

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    Two tone? My guess is that the glue reacted with the dye in the capacitor's plastic wrapper.

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    Thereís a light blue MF style resistor, may be 2W, between R19 and R49; the gloop is clear at one end if it, dark at the other?
    And itís dark around the tab connector (red wire, upper right of board).

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    Don't forget the joker g1's Avatar
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    Hot melt glue gun that was reaching the end of one stick and had a different colour stick put in for reload?

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    Lifetime Member Enzo's Avatar
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    I look at it and I see a dark smokey color goop, that in thin spots is translucent. Doesn't look like different colors, to me, anyway.

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    Yeah I can imagine the design guys going "Let's use really dark colored glue so people will see the mess we made with it".

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    Quote Originally Posted by g1 View Post
    I've always wondered where these so-called 'free radicals' come from.
    Here ya go just had to.

    nosaj

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    Thanks, Siri. 😡

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    Quote Originally Posted by xtian View Post
    Thanks, Siri. ��
    I figured that was probably some kind of auto-correct thing. Just having a bit of fun.

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    This is the 3rd one I've worked on, and they all have this hard gunk. I'm glad its glue, and now to scrape away what I can. Thanks Jazz.

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    Quote Originally Posted by Justin Thomas View Post
    And just for the future, you'll know if it's cap guts. They stink to high heaven if they're fresh. And if not, it's usually seen as a light-colored powder or crust that gets left behind when the electrolyte dries away. If they explode there'll be bits or rolls of aluminum foil in the immediate vicinity.

    And yeah, I'd hesitate to use anything colored black on a circuit board... I'm with Mr. Bass on the "clean up what you can" thing.

    Justin
    Yes, I've seen the aftermath of an exploding electrolytic, and the burst pimple from the old brown paper caps. This goop had me concerned, so thank you

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    Quote Originally Posted by g1 View Post
    I've always wondered where these so-called 'free radicals' come from.
    HA! I didn't even notice that!

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    It's the same colour, just thicker and thinner parts.

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    When you see it up close it doesn't look or feel like hot glue stick. I'd say it was much runnier when applied and its dried much harder than a hot glue.

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    That's spot on

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    Thanks guys for your support, and good humour, once again.

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    Senior Member Pedro Vecino's Avatar
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    I have always wanted to know which brand sells that type of adhesive. Does anyone know the name they usually have (composition, tradename?).
    Thanks!

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    Hi Pedro. I don't think I would recommend it. Its obviously messy, and dries so hard that its difficult to unglue the cap. I still like to use "Silastic" (an Australian brand name for a silicon sealant).

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    I still like to use "Silastic" (an Australian brand name for a silicon sealant).
    Silastic is a trademark of Dow Corning/Dow Chemical for a product family of silicone elastomers.
    In electronics silicones which release acetic acid (smell of vinegar) should be avoided.

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    Quote Originally Posted by Helmholtz View Post
    In electronics silicones which release acetic acid (smell of vinegar) should be avoided.
    Oh. I didn't know that. Do you know the reason? Is it a corrosive action of acetic acid? What would you recommend as an adhesive to secure large capacitors?

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    Is it a corrosive action of acetic acid?
    Exactly that. You don't want acid fumes in electronics. There are special silicones for use with electronics which don't release acetic acid, e.g. GE Silicones RTV 162Q. But I am sure that also Dow Corning has something suitable in their Silastic product family.

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    Quote Originally Posted by Helmholtz View Post
    Exactly that. You don't want acid fumes in electronics. There are special silicones for use with electronics which don't release acetic acid, e.g. GE Silicones RTV 162Q. But I am sure that also Dow Corning has something suitable in their Silastic product family.
    Excellent. Every single time I come on this Forum I learn something new. vielen dank, Helmholtz.

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