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    Rectifier or power tube?

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    kaner

    Posts : 89
    Join date : 2011-09-20

    Rectifier or power tube?

    Post by kaner on Mon Mar 30, 2015 9:32 pm

    A couple of weeks ago I started to have an issue with on of my VTA ST70's on power up.  Occasionally I'd get static on the right side, and I noticed that one of the power tubes was not lighting up.  OK I know all of you are saying well replace that power tube, which is exactly what I should have done.  I'm not sure if it's the experimenter in me or the cheapskate in me but I could coach that tube into firing and all would be fine.

    Last night I powered up and the same filament issue happened but with a new twist.  My rectifier put on a light show!  The fuse blew and I successfully took out a power tube and a rectifier.  After replacing both my amp is running fine.  

    Lesson learned.

    Kaner

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    Re: Rectifier or power tube?

    Post by Guest on Mon Mar 30, 2015 9:36 pm

    just double check the pins in your tube sockets, make sure they are all nice and tight and clean!
    How old is the ST70?
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    kaner

    Posts : 89
    Join date : 2011-09-20

    Re: Rectifier or power tube?

    Post by kaner on Tue Mar 31, 2015 9:03 am

    Good advice, although I knew it was the power tube because when I moved it around the problem followed the tube. The chassis is from the 60's but all else is about 3 years old.

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