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  1. #1
    Top Of The World YMI5150?'s Avatar
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    12.15.13 @ 04:45 PM
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    Default Club Days Plexi Build Tone

    Making some good progress. Check it out.

    http://www.ymi5150.com/clips

    the top video brings chills. poor iphone quality but you get the gist. My buddy Eric playing Eruption live through one of my builds. Slaved into a Peavey Classic 60/60.

    Cheers!
    Custom guitars and high end point to point handwired 68 Marshall SuperLeads

    www.holbrooktone.com

    https://www.facebook.com/#!/holbrooktone

  2. #2
    5150 GilmourD's Avatar
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    12.15.17 @ 05:56 AM
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    Do you/does he use a Variac with your amps or do you have a power transformer that puts out a lower B+?

  3. #3
    Top Of The World YMI5150?'s Avatar
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    he doesnt use a variac. I do. the PT does have lower B+.

    The variac drops volume a bit and adds a small amount of goodness to the tone but its really not required to have kick a$$ sound, as apparent in the youtube clip. Icing on the cake for the last 5%
    Custom guitars and high end point to point handwired 68 Marshall SuperLeads

    www.holbrooktone.com

    https://www.facebook.com/#!/holbrooktone

  4. #4
    5150 GilmourD's Avatar
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    12.15.17 @ 05:56 AM
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    Quote Originally Posted by YMI5150? View Post
    he doesnt use a variac. I do. the PT does have lower B+.

    The variac drops volume a bit and adds a small amount of goodness to the tone but its really not required to have kick a$$ sound, as apparent in the youtube clip. Icing on the cake for the last 5%
    How much lower is the B+ coming out of the PT? Is it comparable to what the B+ would be if you had it on a Variac set to 90VAC?

  5. #5
    Top Of The World YMI5150?'s Avatar
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    both amps have similar PTs with similar B+ voltage so no, B+ is way lower when variac'd.
    Custom guitars and high end point to point handwired 68 Marshall SuperLeads

    www.holbrooktone.com

    https://www.facebook.com/#!/holbrooktone

  6. #6
    5150 GilmourD's Avatar
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    Quote Originally Posted by YMI5150? View Post
    both amps have similar PTs with similar B+ voltage so no, B+ is way lower when variac'd.
    The reason I ask... I've had this hairbrained idea in my head for a few years now... But no money with which to build it.

    Basically, build a 1959 with a PT that keeps the heaters and whatnot at proper 6.3V but puts out 75% of of the normal B+ (about 265V rather than 350V) and load it with 6CA7s. Basically a built-in Variac tone-wise without the detrimental effects of lowering the heater voltage.

  7. #7
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    Quote Originally Posted by GilmourD View Post
    The reason I ask... I've had this hairbrained idea in my head for a few years now... But no money with which to build it.

    Basically, build a 1959 with a PT that keeps the heaters and whatnot at proper 6.3V but puts out 75% of of the normal B+ (about 265V rather than 350V) and load it with 6CA7s. Basically a built-in Variac tone-wise without the detrimental effects of lowering the heater voltage.
    Don't forget to include a WIDE range bias adjustment. When I build my superlead clone, I've been planning to do this. The ClassicTone Transformer line offers some PT like you describe -- they are made for other amps with a stock lower B+, but no reason you couldn't use them in a "permanent-variac'd" marshall clone, since the Heater voltage is standardized. Weber might also make a nice option -- they sell transformers with 2-3 B+ windings so you can choose to use a much lower voltage instead of the "marshall correct" winding.

    I'd recommend Classic Tone output transformers FWIW, but there's absolutely nothing wrong with Weber iron.

  8. #8
    Top Of The World YMI5150?'s Avatar
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    I've been running a variac for 4 years on a dimed plexi with the same set of tubes. no issues with low heater voltages.

    I had George's PT with lower tap and virtual variac as you describe. lowering heater voltage may add to the tone change.

    either wide bias adjustment range or know how to change the bias resistor to keep the trim pot in the right range.

    This is only a part of how to get the right tone. the OT sag is a huge player, as well as the right component value and material, NFB, etc. Biggest part is knowing what to change when you complete the build and its not quite there. no way to follow a recipe for success. too many variables. gotta be a chef in the kitchen
    Custom guitars and high end point to point handwired 68 Marshall SuperLeads

    www.holbrooktone.com

    https://www.facebook.com/#!/holbrooktone

 

 

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