Are a 5aru4 and 5U4 interchangeable?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by kingsxman, Sep 9, 2006.

  1. kingsxman

    kingsxman Silver Supporting Member

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    My budda has a 5aru4 in it for the rectifier..but their web site says it should be a 5u4. I'm assuming these are interchangable.
    Is that correct?
     
  2. brad347

    brad347 Member

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    never heard oof a 5aru4 (not saying it doesn't exist). But I do know that a 5AR4 and a 5U4 are interchangeable TO AN EXTENT. The 5U4 will be a little saggier and it also draws slightly more filament current, so make sure your PT filament winding is beefy enough to handle it (most are).
     
  3. kingsxman

    kingsxman Silver Supporting Member

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    Sorry...mistyped. 5ar4 is whats in there...

    thx
     
  4. Blue Strat

    Blue Strat Member

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  5. kingsxman

    kingsxman Silver Supporting Member

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    Thanks Mike. I appreciate the info. Turns out my KT66 power tubes WERENT bad but my rectifier was. Luckily I had another one lying around to put in in a pinch.

    I'm asking Jeff @ Budda now whether its safe to run the 5u4 in place of the 5ar4
     
  6. ross

    ross Silver Supporting Member

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    Let us know the answer that Budda gives you.
     
  7. kingsxman

    kingsxman Silver Supporting Member

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    Jeff said that it was safe to use an 5u4 in place of the 5ar4. In fact, he didnt remember why they put the 5ar4's in their...
     

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