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Thread: Changing tubes on amp?

  1. #1
    Senior Member wardog's Avatar
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    Changing tubes on amp?

    So the stock power tubes have bit the dust on my blues jr. My question to the forum is, do I just replace the power tubes only or should i replace all the stock tubes?
    The power tubes are El84-R (2 of them) and the others are 12ax7a (3 of them, they seem to be fine).
    I like surprises!!!

  2. #2
    Um, warren, I know you too well. You were just looking for an enabler like me to say "just buy another amp".
    (DC 245 Ted / DGT / 513 / Santana / McShootout / Cu22 Rosewood / SAS / Cu22 Semi hollow / Sig LTD / Mira korina / HBII / SE Angelus Custom) >> {C, H, Dallas, Original Sewell}

  3. #3
    If it's not in fact another amp you need...standard spec EL84s generally wear pretty fast. But preamp tubes last a very long time. Like...decades. So you're good to go if the preamp tubes seem fine just getting another set of EL84s. Chances are the amp is cathode biased, so you don't need to have the amp biased. Just insert the new tubes, and off you go!
    If something is too hard to do, then it's not worth doing. You just stick that guitar in the closet next to your short-wave radio, your karate outfit and your unicycle and we'll go inside and watch TV.
    -- Homer J. Simpson

  4. #4
    Senior Member wardog's Avatar
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    Quote Originally Posted by watelessness View Post
    Um, warren, I know you too well. You were just looking for an enabler like me to say "just buy another amp".
    Ha!!!! No Sir, just want to have my fender blues jr rocking again! But, if I was; what would my man watelessness recommend?

    Quote Originally Posted by LSchefman View Post
    If it's not in fact another amp you need...standard spec EL84s generally wear pretty fast. But preamp tubes last a very long time. Like...decades. So you're good to go if the preamp tubes seem fine just getting another set of EL84s. Chances are the amp is cathode biased, so you don't need to have the amp biased. Just insert the new tubes, and off you go!
    This is the first time I have had to touch my amp. The stock stuff lasted for over 3 yrs. I don't gig so this is why. So sounds like I am straight.
    I like surprises!!!

  5. #5
    Quote Originally Posted by wardog View Post
    Ha!!!! No Sir, just want to have my fender blues jr rocking again! But, if I was; what would my man watelessness recommend?
    you need a Dallas...just saying...
    (DC 245 Ted / DGT / 513 / Santana / McShootout / Cu22 Rosewood / SAS / Cu22 Semi hollow / Sig LTD / Mira korina / HBII / SE Angelus Custom) >> {C, H, Dallas, Original Sewell}

  6. #6
    Senior Member garrett's Avatar
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    Quote Originally Posted by LSchefman View Post
    If it's not in fact another amp you need...standard spec EL84s generally wear pretty fast. But preamp tubes last a very long time. Like...decades. So you're good to go if the preamp tubes seem fine just getting another set of EL84s. Chances are the amp is cathode biased, so you don't need to have the amp biased. Just insert the new tubes, and off you go!
    +1
    --Garrett--

  7. #7
    Senior Member wardog's Avatar
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    Thanks guys for the help. Replaced EL84 and amp is purring like a cat. The funny part of the experience for me was not realizing the amp sound/power was going. I unknowingly put it of as the instrument cable was going bad.
    I like surprises!!!

  8. #8
    Senior Member andy474x's Avatar
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    Tubes can be funny like that... I had a preamp tube go a while back and my signal crackled like crazy when I adjusted my volume pot, but luckily I deduced that it was a tube before I went replacing pots.
    -I'm no expert, but it seems to work and I haven't electrocuted myself yet. Which is pretty much the standard I live by.

    SE Custom 24 25th Anniversary - SE Akesson+57/08's - SE 30 Head/Cab

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