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5e3 help

Discussion in 'Amp Tech Center' started by Achysklic, Oct 18, 2020.

  1. Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    Meter:
    V with wave form line = AC
    V with line underscored with ... = DC

    Your meter is set for VAC
     
  2. Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    Red probe on rectifier pin8. Blk probe to ground. Meter set to 600 in the yellow section of the dial.
     
  3. Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    If no VDC on pin 8 then switch to VAC and put probes on pin2 and pin 8. We are looking for 5VAC heater voltage for the rectifier tube.
     
  4. Achysklic

    Achysklic Tele-Afflicted

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    No reading
     
  5. Achysklic

    Achysklic Tele-Afflicted

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    6.7v on 6v6
    5.5v on rec
     
  6. Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    Check to make sure the rectifier tube is inserted in the socket correctly. You may have a bad rectifier.
     
  7. Achysklic

    Achysklic Tele-Afflicted

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    Yes seated really good was a brand new tube
     
  8. Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    .EDIT I had that backwards.

    Rectifier red wires to pins 4 & 6
    Yellow to pins 2 & 8
     
  9. Achysklic

    Achysklic Tele-Afflicted

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    I rechecked pins 2,8 on rec VAC they are pin 2 is 2.0v and pin 8 is 2.7v
     
  10. Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    Does the rectifier get warm from heater voltage?

    BTW heater voltage is always measured with a probe on each wire.
     
  11. Achysklic

    Achysklic Tele-Afflicted

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    Rec pins 4&6 is 388v
    On yellow pins 2&8 show nothing
     
  12. Nickfl

    Nickfl Friend of Leo's

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    Being brand new doesn't mean it's not defective. You should try another rectifier tube if you have one. You have voltage on your rectifier heater pins but the tube is not heating up which sounds like a defective tube.

    You would also be well advised to be doing all of this plugged into a light bulb limiter until you solve your problem and make sure you have no shorts in your amp. A current limiting device of some sort is a necessary tool for working on amps and going without one puts you at risk of destroying a power transformer.
     
  13. Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    Disconnect pin 8 yellow wire. With power *on* measure with probe on that wire and the other probe on pin2. Looking for 5VAC from the PT.
     
  14. Achysklic

    Achysklic Tele-Afflicted

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    Can I make a light bulb limiter or buy one . Also I have no other rec tubes. Plenty of everything else though. Figures
     
  15. Achysklic

    Achysklic Tele-Afflicted

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    Ok hang on
    On pin 2 and wire from 8 got 5.5vac
     
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  16. Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    If you have 5 VAC on the rectifier yellow wire, then pull the rectifier tube and meter for resistance and/or continuity of pins 2 & 8 of the tube itself.
     
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  17. glenlivet

    glenlivet Tele-Holic

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    https://robrobinette.com/How_The_5E3_Deluxe_Works.htm

    If you look about half way down this page, you should see "Standard 5E3 DC Voltages".
    If you are not getting readings *in the ballpark* of these voltages, start looking at the rectifier wiring and/or the rectifier itself.
    -- but it looks like others have already pointed that out.....
     
  18. Achysklic

    Achysklic Tele-Afflicted

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    Umm my rec tube doesn’t have a pin 2 ???? 54CBD090-124D-479D-BD5F-1921F40910A6.jpeg .
     
  19. Achysklic

    Achysklic Tele-Afflicted

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    Ok I looked at pins wrong on tube. Anyway it is getting all green lights for good conduct on pins 2 & 8
     
  20. elpico

    elpico Tele-Afflicted

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    It's the pin closest to your thumb in that picture
     
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