How to tighten the bass in 5E3 tweed deluxe

Discussion in 'Amp Central Station' started by Luca, Dec 10, 2008.

  1. Luca

    Luca Tele-Meister

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    I have a Victoria 20112 (tweed deluxe clone), and I replaced the stock Jensen speaker with a Weber P12Q (12A125).
    The amp sounds better now, but I'd like to keep the bass tighter, avoiding them to flub/fart when the amp is driven.

    Any suggestions?

    Maybe a Celestion Blue will do the job?

    Thanks
     
  2. Wally

    Wally Telefied Ad Free Member

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    Change the coupling caps... .1's .... coming off the plates of V1 to .02's.
     
  3. Natstrat79

    Natstrat79 Tele-Meister

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    +1000, Change the coupling capacitors. I prefer to change them all to .047uf instead of .022uf. But that is purely preference anything smaller than the .1uf will make an improvement, how far you want to go is up to you.
     
  4. red57strat

    red57strat Friend of Leo's Silver Supporter

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    Changing the first filter cap to 30uF (or adding another 16uF in parallel with it) will tighten it up a bit.
     
  5. T_red7882

    T_red7882 Tele-Afflicted

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    I've also heard about changing hte rectifier form a 5y3 to a 5AR... something will make it much tighter, but with less sag.
     
  6. Shepherd

    Shepherd Friend of Leo's

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  7. Natstrat79

    Natstrat79 Tele-Meister

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    Also the 5v4g works.
     
  8. woodman

    woodman Grand Wazoo @ The Woodshed Gold Supporter

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    i tried the Paul C mod in my 5E3 for that reason, then changed it back. it definitely tightened up the bottom end, but it took away the good midrange grunt. made it too "clean" (if you can say that about a 5E3) for my taste.
     
  9. JamonHamon

    JamonHamon Friend of Leo's

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    A tweeds best friend is Joe Barden pickups for what your talking about
     
  10. sjhusting

    sjhusting Tele-Afflicted

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    +1 for the coupling caps.

    The basic problem is that the preamp produces way too much bass for the power stage. Reducing the coupling caps reduces the bass that gets through.

    You can reduce all the 0.1 coupling caps if you want.

    You can also experiment with smaller bypass caps on the preamp tubes; around 4.7uF would be a good starting place.

    steven
     
  11. ThermionicScott

    ThermionicScott Poster Extraordinaire

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    Be prudent -- too small a coupling capacitor to the volume knob will really hurt low-frequency response at lower volume settings. 0.02uF would be good there, 0.005uF would be good between the 2nd gain stage and the PI, and 0.02uF is good between the PI and output tubes. In each case, Fc is more than an octave below low-E, but the RC time constant has been reduced, which helps with the farting. :D

    Fc = 1 / (2 * Pi * R * C)

    Good luck! Extra filtering in the power supply will help a little, too, but going overboard can be hard on the rectifier tube.

    - Scott
     
  12. sjhusting

    sjhusting Tele-Afflicted

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    This is exactly where I ended up in mine - well, .022 and .0047, in exactly those spots. I didn't add filtering to the PS, but I bumped the values up to 22uF

    steven
     
  13. Ricky D.

    Ricky D. Doctor of Teleocity

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    My Mission 5E3 is stock. Rather than get surgical with it, I just put a parametric EQ pedal in front of it, set to cut the bass. Works just fine, but I don't use it much. I really like the huge fat 5E3 cleans.
     
  14. PhatTele

    PhatTele Tele-Holic

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    I have two 5E3 clones that I built. I needed the tight bass too for small room country gigs without loosing the basic tweedy midrange character of the amps. So, this is what I did:

    1) 50 watt Weber 12F150
    2) 5V4 rectifier
    3) 6L6s
    4) one is still cathode biased and the other is fixed adjustable bias
    5) Paul C mod
    6) Beefed up the transformers with David Allen's TP40D and TO26

    I guess what I ended up with was basically two 1x12 5E5 Tweed Pros. All the midrange I need is still there, but I also have the bottom end I need for tic tac rhythm and bass string runs.
     
  15. barfoden

    barfoden Tele-Meister

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    Scoot is pretty spot on with his analysis..
    As he said the first coupling caps need to be fairly large because of the way it is set up.

    On the more common volume pot setup a 0.0047µf is sufficient in that position but in a 5e3 type you want at least 0.022µf or a 0.047µf depending on how loud you will play. The 0.022µf will actually shave of some low end when the tone pot is set at 9 o'clock (~40k/960k), so if you want the full low end go with a 0.047µf, but the coupling cap to the PI and the power couplers can be decreased to smaller values, say 1/4 of the stock values.
    which would be a 0.0047µf in front of the PI and 0.022µf in the power stage to the 6v6 tubes.
     
  16. TheRumRunner

    TheRumRunner Tele-Afflicted

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    I had a similar issue, however mine is 6L6 based.

    The weber 12a125 just was not what I was looking for, so I tried...

    A Eminence Cannabis Rex
    A Eminence The Wizzard
    A Jensen C12k

    and finally a Celestion Vintage 30 which works very well for the top end.

    DW
     
  17. leebman

    leebman Tele-Meister

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    Try turning the volume knob down tightens the bass right up.
     
  18. peteb

    peteb Friend of Leo's

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    I like the fat clean with loose bass vs tight bass with thin clean choice

    It clarifies the question

    Either have it fat and loose or have it tight and thin

    Your choice
     
  19. fezz parka

    fezz parka ---------------------------

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  20. leebman

    leebman Tele-Meister

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    Fezz, dude time to spend some time away from the soldering iron.:eek:
     
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