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    Disturbing pop/crack

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    10-E-C

    Posts : 87
    Join date : 2014-02-12
    Age : 63
    Location : upper east tn

    Disturbing pop/crack

    Post by 10-E-C on Mon Jul 13, 2015 8:06 pm

    After an evening of enjoying my M125's I had something happen on power down, a very loud pop when I turned the toggle switch off to one of my M125s. It was late at night so I waited till the next day to powered up my system and listened to some music which was clean and enjoyable as ever. When I turned the amp off....POP...

    After letting it cool down I did a look see around to find anything obvious to cause the "pop". Everything looked fine, fired it back up without the preamp running and did some voltage checks, all normal. Turned it off again and "pop" kind of loud. What I found out to be the problem was one of my driver tubes, an old 59 RCA clear top 12au7a. It played fine but pops during shutdown.

    I had some more of these tubes and replaced it, and everything is good. I'm just curious if anyone has encounter this before?

    Terry from Tennessee

    MontanaWay

    Posts : 781
    Join date : 2014-02-06
    Age : 58
    Location : Brookings, Oregon

    Re: Disturbing pop/crack

    Post by MontanaWay on Mon Jul 13, 2015 9:57 pm

    tubes wear out. If you consider the heat stress they go through, it is amazing they last as long as they do, especially one dated from '59!
    Throw it out, it has had its time!

    10-E-C

    Posts : 87
    Join date : 2014-02-12
    Age : 63
    Location : upper east tn

    Re: Disturbing pop/crack

    Post by 10-E-C on Tue Jul 14, 2015 6:53 am

    MontanaWay wrote:tubes wear out. If you consider the heat stress they go through, it is amazing they last as long as they do, especially one dated from '59!
    Throw it out, it has had its time!


    but but but...I'm a 1953 who pops and cracks, would ya throw me out... Shocked

    I put another '59 tube in, I have a few more of them.

    pmarcin

    Posts : 131
    Join date : 2009-01-20
    Age : 69

    Re: Disturbing pop/crack

    Post by pmarcin on Tue Jul 14, 2015 8:33 am

    C'mon, Terry, Rice Crispies snap, crackle and pop. When tubes do this, they're well done. Give the tube a Viking funeral in the bathtub and sail on.


    Last edited by pmarcin on Tue Jul 14, 2015 8:38 am; edited 1 time in total (Reason for editing : more info)

    deepee99

    Posts : 1333
    Join date : 2012-05-23
    Location : Wallace, Idaho

    Re: Disturbing pop/crack

    Post by deepee99 on Fri Jul 17, 2015 6:36 am

    Had a pre-amp tube (6CG7) just this week go south on me; wouldn't even pass a signal, just loud noises.
    About my age, mid-60s. Yes, a Viking burial is in order.

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