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5f1 with tremolo

Discussion in 'Shock Brother's DIY Amps' started by aaronftnm, Apr 16, 2021.

  1. aaronftnm

    aaronftnm TDPRI Member

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    I did some searching about building a 5f1 with tremolo, but could not find any real answers. Has anyone made something like this work? I have seen people say to build a vibro champ and change the tone stack, but I also saw somewhere else on the internet a schematic someone added a trem circuit to. I will post it here...i guess my question is has anyone sucessfully done something like this?? Also, I dont really want to make a tremolux, or anything like that. I would like to build a 5f1 or even 5f2, then get wobbly.
     

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  2. Mark the Moose

    Mark the Moose Tele-Afflicted

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    I think Rob Robinette (@robrob) has stand alone reverb and trem circuits on his site intended for integrating into other amps.

    While you don’t want to go full tremolos, maybe consider a 5f11 vibrolux? You might at least find it easier to build a 5f11 front end with a champ single ended power section.
     
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  3. Paul-T

    Paul-T Tele-Holic

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  4. aaronftnm

    aaronftnm TDPRI Member

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    I have used Rob’s site many times, but only now did I notice those pages. I will have to take a closer look.
    The Vibrolux is fixed bias and uses bias modulating tremolo, I think? Where as the 5f1 is cathode biased?
     
  5. Telenut62

    Telenut62 Poster Extraordinaire

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    Build a 5F1.....use a box.
     
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  6. EmWeAh

    EmWeAh Tele-Meister

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    I think an AA764 Vibrochamp would be what you are looking for. You could implement a switch to lift the tone controls and deactivate the NFB loop to get you in the ballpark of a 5F1 plus you also have some nice blackface'ish sort of sounds in one amp.

    Edit: and the chassis gives you much more room to work in compared to this little tweed 5F1 housing...
     
    Last edited: Apr 17, 2021
  7. aaronftnm

    aaronftnm TDPRI Member

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    Thanks for the suggestions. For now im going to finish up the 5f2 build in a blank chassis that I am working with, then see if I can add one of Robs ideas at a later date. I grabbed some extra parts to add it later when I feel up to messing around.
     
  8. tweedman2001

    tweedman2001 Tele-Afflicted

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    Not sure what's inside but the Eric Clapton Vibro Champ is supposedly based off a 5F1 with 50s output tube bias tremolo while a 60s Vibro Champ is preamp bias tremolo. The schematic you posted may be the same. I don't know. If not maybe a schematic can be located.
     
  9. jsnwhite619

    jsnwhite619 Friend of Leo's

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    I've done a lot of tinkering the past year or so with hot rodded 5f2a Princetons and borrowing aspects of the AA764 when needed. I went around the moon on this last one to set it up best for hot humbuckers and a 5881 power tube. My suggestion would be go the Vibro Champ route and modify it for a raw/5f1 switch. Also, you would need to lift/disable the second gain stage after the Treb/Bass controls to get closer to the 5F1 sound and not have it screaming overdrive all the time.

    Vibro Champ pros:
    • wider chassis to work in
    • extra tremolo tube hole is already accounted for
    • your depth & speed controls are already accounted for
    • more room to add mods and switches

    Another option if you want to stick with the tweed route would be to get a 5f11 Vibrolux chassis. The PT cutout would be a direct fit. You'd have Vol/Tone AND speed/depth for the tremolo. You'd have one empty 6v6 socket, but everything else about the chassis would be perfect for a Tweed Vibro Princeton. Actually, I can't believe I have never thought about this latter scenario until now...
     
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  10. Bitsleftover

    Bitsleftover Tele-Holic

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    I’ve added an tremolo like the EC Vibrochamp to a 5F2A.
    I wired a switch which killed the tremolo in the off position, then connected the tremolo and added a V1B cathode bypass cap in the on position to make up the loss caused by the tremolo. Along with the tremolo footswitch I now have 3 settings.
    1- Stock Princeton
    2- Princeton with a V1B cathode bypass gain boost tremolo off
    3 Tremolo on.
    It makes it a very versatile amp. I love it.
    There is no downside. So long as your PT has enough juice to power an extra 12AX7
     
    jsnwhite619 likes this.
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