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Thread: Valve base down.. .

  1. #1
    Join Date: Dec 2012

    Location: Stoke on trent

    Posts: 959
    I'm Steve.

    Default Valve base down.. .

    What happens if a valve base goes down? I've got sound through both channels but noticed the one of my right EL34s wasn't glowing. Swapped the valves around. Same position not glowing. There was a bit of rustling on that side earlier so I re sat all valves. Could I have knocked a connection on the valve seat?? Easy enough to change? Ive git a few days off and was hoping fir a few listening sessions. ..Could I remove one of the left hand valves and use it at half output until i get it looked at or is there a risk of damage?

  2. #2
    Join Date: Dec 2012

    Location: Stoke on trent

    Posts: 959
    I'm Steve.

    Default

    I'll give it a go thanks. Typically I have new speakers to listen to.
    If I was to run the amp with one el34 inserted on each side, would there be risk of damage or does the output just half?

  3. #3
    Join Date: Dec 2012

    Location: Stoke on trent

    Posts: 959
    I'm Steve.

    Default

    Amp is a prima Luna Prologue 1 by the way

  4. #4
    Join Date: Dec 2012

    Location: Stoke on trent

    Posts: 959
    I'm Steve.

    Default

    Haha.. I think I'll leave it. Bloody valve amps....

  5. #5
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

    Default

    I wouldn't do it myself.

    This kind of situation is why I always have a spare (back-up) amplifier. A tiny SMSL is ideal.

  6. #6
    Join Date: Dec 2012

    Location: Stoke on trent

    Posts: 959
    I'm Steve.

    Default

    I've got the bottom off. Can't see anything out of sorts.
    The bottom of the pins are quite loose and rattley, is that normal??.

  7. #7
    Join Date: Jun 2008

    Location: Happy Cheshire

    Posts: 675
    I'm Duncan.

    Default

    If it's a push pull amp then both tubes are used at the same time in a "push pull" circuit. The channel switching happens before the signal gets to the power tubes.

    Confusion with this type of amp is that power can be cut in half by removing one of the two tubes, this is not how it works. The two tubes are a "team" and taking one out would make half of the output signal and the output transformer search for something to amplify, creating a horrid tone called "crossover distortion."

    Not a practice I would recommend.

  8. #8
    Join Date: Dec 2012

    Location: Stoke on trent

    Posts: 959
    I'm Steve.

    Default

    I'll take it to someone knowledgeable. Not sure tgere is anyone local, sadly as i think it woukd be a quick fix. Week off work and no music.

  9. #9
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 6,089
    I'm Alan.

    Default

    Quote Originally Posted by Bourney View Post
    I'll take it to someone knowledgeable. Not sure tgere is anyone local, sadly as i think it woukd be a quick fix. Week off work and no music.
    I'll gladly look at it for you but you would have to get it to me.

  10. #10
    Join Date: Mar 2014

    Location: KY - Scotland

    Posts: 5,465
    I'm Mike.

    Default

    Quote Originally Posted by Bourney View Post
    I'll take it to someone knowledgeable. Not sure tgere is anyone local, sadly as i think it woukd be a quick fix. Week off work and no music.
    Do you want a loaner?

    I have a Claymore MK2 amp sitting doing nothing, it's not perfect as there a channel imbalance at low volume but you're welcome to borrow it.

    Posted tomorrow you could have it by Thursday

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