The Dynaco Tube Audio Forum

Would you like to react to this message? Create an account in a few clicks or log in to continue.
The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Tubes4hifi VTA tube amp and preamp kits and all Dynakitparts.com products


3 posters

    UPGRADED C-13 AND C-14 GET VERY HOT

    avatar
    detoxer


    Posts : 10
    Join date : 2011-08-17

    UPGRADED C-13 AND C-14 GET VERY HOT Empty UPGRADED C-13 AND C-14 GET VERY HOT

    Post by detoxer Wed Feb 22, 2012 1:17 pm

    UPGRADED C-13 AND C-14 GET VERY HOT, tubes4hifi low gain board. Is this a normal situation? I have noticed some gritty low level noise in both speakers when music is not playing. This noise is present with shorting plugs installed in imput jacks. Was thinking there may be a problem with the power supply.
    Roy Mottram
    Roy Mottram
    Admin


    Posts : 1840
    Join date : 2008-11-30

    UPGRADED C-13 AND C-14 GET VERY HOT Empty Re: UPGRADED C-13 AND C-14 GET VERY HOT

    Post by Roy Mottram Wed Feb 22, 2012 2:49 pm

    did you get those from Roy or Bob? are they 400v or 450v, and what capacitance? 100 or 120uF?
    just let me know and we'll replace them for you
    avatar
    detoxer


    Posts : 10
    Join date : 2011-08-17

    UPGRADED C-13 AND C-14 GET VERY HOT Empty UPGRADED C-13 AND C-14 GET VERY HOT

    Post by detoxer Wed Feb 22, 2012 4:52 pm

    Got these from Bob with the purchase of an st70 this past year, not sure of the size, will look tonight and post. The unit functions fine except for the gritty buzzing in both speakers at very low volume or with no input. Again the two caps get warm to the point that I can't keep my calussed finger on them for more than two seconds. Is this likley to cause this buzzing.
    avatar
    detoxer


    Posts : 10
    Join date : 2011-08-17

    UPGRADED C-13 AND C-14 GET VERY HOT Empty UPGRADED C-13 AND C-14 GET VERY HOT

    Post by detoxer Wed Feb 22, 2012 6:59 pm

    The caps are 120UF 450volt
    Sal
    Sal


    Posts : 221
    Join date : 2009-02-05
    Location : Central New Jersey Dynaco-ST70.com

    UPGRADED C-13 AND C-14 GET VERY HOT Empty Re: UPGRADED C-13 AND C-14 GET VERY HOT

    Post by Sal Thu Feb 23, 2012 9:14 am

    Did you reverse the polarity of the capacitors?

    Sal
    avatar
    detoxer


    Posts : 10
    Join date : 2011-08-17

    UPGRADED C-13 AND C-14 GET VERY HOT Empty Re: UPGRADED C-13 AND C-14 GET VERY HOT

    Post by detoxer Thu Feb 23, 2012 9:51 am

    No, unit has always functioned well, just recently noticed this problem.
    Sal
    Sal


    Posts : 221
    Join date : 2009-02-05
    Location : Central New Jersey Dynaco-ST70.com

    UPGRADED C-13 AND C-14 GET VERY HOT Empty Re: UPGRADED C-13 AND C-14 GET VERY HOT

    Post by Sal Thu Feb 23, 2012 10:27 am

    OK, I read your post wrong, I thought you just "upgraded" C13 and C14...

    Sal
    avatar
    detoxer


    Posts : 10
    Join date : 2011-08-17

    UPGRADED C-13 AND C-14 GET VERY HOT Empty Re: UPGRADED C-13 AND C-14 GET VERY HOT

    Post by detoxer Fri Feb 24, 2012 11:56 am

    Well it turns out that the center tube was not making good contact. With the amp on I was able to stop the noise by touching the center tube with my finger. I sprayed contacts with deoxit and all is well again. I'd like to thank Bob Latino for his insight in helping me resolve this issue, Bob has also assured me that C-13 and C-14 will normally run warm without concern. This tubes4hifi st70 has done nothing but please me since day one. I have had dealings with both Bob and Roy and can't say enough good things about them.

    Sponsored content


    UPGRADED C-13 AND C-14 GET VERY HOT Empty Re: UPGRADED C-13 AND C-14 GET VERY HOT

    Post by Sponsored content


      Current date/time is Thu Mar 28, 2024 9:54 pm