no distortion tweed deluxe 5e3 build. only clean

Discussion in 'Shock Brother's DIY Amps' started by ouaouaron, Oct 4, 2019.

  1. ouaouaron

    ouaouaron TDPRI Member

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    I just built a 5e3 and cannot get it to distort, only get louder and clean.

    I think that a few of my voltages are a bit low and some high for V1 and V2
    V1
    1 151
    3 1.3
    6 155
    8 1.3

    V2
    1 119
    3 1.7
    6 178
    7 5.7
    8 65

    I am considering using a 12AX7 in V1 rather than 12Ay7 but the voltages look a bit off.
    I should be testing with all tubes in correct?

    I would appreciate some help thanks
     
  2. rolandson

    rolandson Tele-Holic Silver Supporter

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    Jump over to Strat-Talk and ask a guy named Fezz Parka. He knows about these things.
     
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  3. Fluddman

    Fluddman Tele-Meister Silver Supporter

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    My 5e3 is a clean loud amp at home. It's only when I am cranked playing with a drummer that I run out of clean headroom.

    Make sure the treble is cranked as well as the volume.

    Cheers
     
  4. fasteddie42

    fasteddie42 Tele-Afflicted

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    can you run in wide open with no grind?
     
  5. milocj

    milocj Friend of Leo's Ad Free Member

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    Just a possibility here, but do you have the unused channel volume at max or close to it? There's interaction between both channels at all times and having the unused channel's volume way up will clean up and lower the overall volume.
     
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  6. Fluddman

    Fluddman Tele-Meister Silver Supporter

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    When mine start to break up it still very loud!
     
  7. ouaouaron

    ouaouaron TDPRI Member

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    thanks for the responses. I looked at it late last night and found that my 12ax7 and 12ay7 were switch so I switched them and then took voltages again. everything is close to normal within 10% but the V2 pin 7 is still very low at about 3. could this pin be the cause? I checked the resistors above pin 7 and they are good. perhaps I need to solder them again.
     
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  8. Wally

    Wally Telefied Ad Free Member

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    What are your voltages and bias numbers for the power tubes? Ime, that just not the way a 5Y3 should work....unless the biasing is very cool. If the bias is cool, the amp will not sound like a 5E3, ime. I once overhauled one that was a ‘clean machine’ and left it that way for the owner to check out. He liked it that way. I didn’t care for it at all....not only was it clean, but it was no as musical as it should be.
     
  9. ouaouaron

    ouaouaron TDPRI Member

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    they are:

    V3
    3 369
    4 337
    8 20

    v4
    3 379
    4 336
    8 20
     
  10. elpico

    elpico Tele-Holic

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    That particular pin is difficult for most meters to measure so it's totally normal to get a wacky number there. Measure the voltage on pin 8 and the voltage at the other end of the 1.5k resistor attached to pin 8. If those are in the normal range and 1 or 2 volts different then everything is working fine in that stage. The true voltage on pin 7 is the same as that second measurement, even if your meter can't tell.
     
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  11. JohnnyCrash

    JohnnyCrash Doctor of Teleocity Gold Supporter

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    After switching those preamp tubes to their proper place, did things improve?

    You said “late last night,” so you might not have tried to crank it since the swap.

    The difference in gain between those two are pretty dramatic. The location they were in might’ve killed the gain. Accidentally swapping them could’ve been the problem.
     
  12. ouaouaron

    ouaouaron TDPRI Member

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    still distortion, I did try my humucker on a tele and it does break up a little at very high volume.
     
  13. ouaouaron

    ouaouaron TDPRI Member

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    thanks will do that
     
  14. Wally

    Wally Telefied Ad Free Member

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    and....are you using a 250ohm bias resistor?

    apologies for not replying sooner. I don’t know how I missed your post.
     
  15. printer2

    printer2 Poster Extraordinaire

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    There is not much reason for the amp to distort till the output clips.
     
  16. Doctor49

    Doctor49 TDPRI Member

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    I have the same problem with a Mojotone 5e3 build.
    Is there any update to this?
    I will repeat the suggestions here and then see what I can report
     
  17. Wally

    Wally Telefied Ad Free Member

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    just a suggestion, but a new thread to deal with your particular amp might be a better pathway. If you do start a new thread...or if you hijack this related thread, do you have a voltage chart made up...complete with biasing numbers?
    And.
    .....WElcome to the forum.
     
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  18. Doctor49

    Doctor49 TDPRI Member

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    Thanks!
    I will start a new one with the information shortly.

    Looking forward to sharing in this forum
     
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