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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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  • #2
    Glue. Radicals vent from the top.
    --
    I build and repair guitar amps
    http://amps.monkeymatic.com

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    • #3
      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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      • #4
        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
        "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. -
        "Of course that means playing **LOUD** , best but useless solution to modern sissy snowflake players." - J.M. Fahey -
        "All I ever managed to do with that amp was... kill small rodents within a 50 yard radius of my practice building." - Tone Meister -

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        • #5
          Originally posted by xtian View Post
          Radicals vent from the top.
          I've always wondered where these so-called 'free radicals' come from.
          "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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          • #6
            Itís weird for the gloop used to mechanically secure parts to the board to be 2 tone.
            My band:- http://www.youtube.com/user/RedwingBand

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            • #7
              I think that is just the light playing tricks.
              It's weird, because it WAS working fine.....

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              • #8
                Two tone? My guess is that the glue reacted with the dye in the capacitor's plastic wrapper.

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                • #9
                  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).
                  My band:- http://www.youtube.com/user/RedwingBand

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                  • #10
                    Hot melt glue gun that was reaching the end of one stick and had a different colour stick put in for reload?
                    "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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                    • #11
                      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.
                      Education is what you're left with after you have forgotten what you have learned.

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                      • #12
                        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".
                        When the going gets weird... The weird turn pro!

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                        • #13
                          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
                          Binkie McFartnuggets‏:If we really wanted to know the meaning of life we would have fed Stephen Hawking shrooms a long time ago.

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                          • #14
                            Thanks, Siri. 😡
                            --
                            I build and repair guitar amps
                            http://amps.monkeymatic.com

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                            • #15
                              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.
                              "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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