Transformer Volume Control Preamp

Discussion in 'Everything Audio' started by Prime Minister, Aug 12, 2018.

  1. Prime Minister

    Prime Minister Site Owner Staff Member

    @Redboy
    Having heard how fantastic John VFs Redboy built transformer preamp sounds, I just gotta get one for myself. As I understand the maker of those volume controls no longer sells to the DIY crowd, what is the closest I could get to one of these?

    Thanks in advance!
     
    Redboy likes this.
  2. Redboy

    Redboy Knobophobe

    Fortunately for you (and all of us!), the secret sauce is still readily available.

    The magic is in the autoformers, which are wound by Dave Slagle and available for purchase in a variety of configurations at Intact Audio.

    http://www.intactaudio.com/atten.html

    All of these attenuators have the same sound; the options buy different switches and
    level stepping.

    Buy a set and box ‘em up!
     
  3. mhardy6647

    mhardy6647 Señor Member

    Redboy likes this.
  4. Redboy

    Redboy Knobophobe

    Yes and no. Maybe?

    @JohnVF’s preamp is built with John Chapman’s Bent Audio Slagleformer modules, which are no longer available to DIY hobbyists.
     
  5. inthewoods

    inthewoods AARP Member

    Like ours
     
  6. Prime Minister

    Prime Minister Site Owner Staff Member

    So how close could I get? To what John has?
     
  7. Redboy

    Redboy Knobophobe

    You can have all very same sound, but you can’t have the remote control.

    The Elma 47 step attenuators are the ticket, methinks. If balance control is important, you’ll want the mono pair.
     
  8. Prime Minister

    Prime Minister Site Owner Staff Member

    No remote???? Booooooooooooooo

    So I'd need a pair of monos, or a single stereo. Then some sort of source selector. A box and a bunch of RCAs?
     
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  9. mhardy6647

    mhardy6647 Señor Member

    add a good quality buffer (cathode follower?!), use long, umm, interconnects, and put the volume control next to your comfy chair

    ;)

    You can get source selector switches with a remote control. I have one I found at the dump, branded Philips. :)
     
    Redboy likes this.
  10. JohnVF

    JohnVF Administrator Staff Member

    Muahahahaha.
     
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  11. mhardy6647

    mhardy6647 Señor Member

  12. JohnVF

    JohnVF Administrator Staff Member

    Hey there! I hope all is well in your neck of the woods.

    And everybody should get a TVC, there's nothing within sane or even moderately insane prices that comes close, at least, that's how I hear it. I hate -most- preamps, but this one... <3. All hearts and listening. I need a t-shirt that says "All passive preamps aren't remotely the same just because they don't plug in!"
     
    Redboy likes this.
  13. Redboy

    Redboy Knobophobe

    It might be an interesting conversation starter... Or, possibly, an effective social repellent. :)
     
    BobA likes this.
  14. Redboy

    Redboy Knobophobe

    You’ve got this!
     
  15. Prime Minister

    Prime Minister Site Owner Staff Member

    Oh, and some wire! And solder.

    Or do I just swap out my existing volume control for one?
     
  16. Prime Minister

    Prime Minister Site Owner Staff Member

    I can just see the ladies eyes glaze over....
     
    BobA likes this.
  17. Ernie

    Ernie Activated

    FWIW, the source selector that Luther built for me is an Elma, from Parts Connexion.
     
  18. mhardy6647

    mhardy6647 Señor Member

    Nice phraseology :)
    I'd wear one.
     
  19. mhardy6647

    mhardy6647 Señor Member

  20. Prime Minister

    Prime Minister Site Owner Staff Member

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