Thursday, 19 September 2013

BJFE / Bearfoot Model G

I was struggling to get this one 21 columns wide max, so Miro will have to forgive me for the placing the Nature pot wires at different sides of the board.  Sorry mate :o)

Info about the original:

The Model G captures the unique voice and response of an often overlooked brand of amps from the 50s/60s ~ the Gibsons that were right there at the beginning with Fender, Valco ,Vox and Marshall..

Somewhere near the tweeds and supros but with a stronger and clearer voice, and a particular upper mid sound and snarl.

The Model G is related to the Honey Bee the same way a Gibson Falcon or GA40 is related to a Supro … cousins with obvious similarities, but important differences.

The volume, drive and nature controls are on both models.

The C knob is a big part of the difference – it controls several things at once:  the upper mids eq and snarl and  slight speaker compression … like adjusting to different speaker choices and ages or even like moving a mic aimed at the speaker.







35 comments:

  1. i'm going to build this one today but i'm counting 23 cuts, not 22.

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    1. On reflection I shifted it round before exporting so you're probably right :o) I'll fix it, thanks

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  2. Fantastic sound! Great choice IVIark!
    what a great sounding pedal. I love the old Gibson amps and I was always surprised no one ever really payed to much attention to them.
    Early recordings by Les Paul from 1957 and such always show these Gibson amps.

    Definitely on my to-do list (number 6).

    Thank you

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  3. i'd like to see the schematic for it to check the vero against it. I built it (i'm 100% certain that I didn't make any errors) and it doesn't work. are you sure that the drain of Q1 is supposed to go to ground? when I remove Q1 it kinda works but it doesn't have much output.

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    1. Q1 and Q2 are back to back clippers to ground, gate of one commoned to the source and drain of the other.

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    2. Oops, snip out the link between pin 6 and Q2 drain. God knows where that came from.

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    3. That did it! VERIFY IT! it sounds great.

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    4. update the layout without that link and you're good to go. so it should have 23 cuts and 6 link.

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  4. Just built it without the link between pin 6 and Q2 drain.

    It works.

    But the "C" is subtle. I could tell the difference when the pot is fully cw and ccw, but not that big of a difference. Maybe it's just my build.

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    1. hmmmm. the "C" isn't subtle on mine.

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    2. "C" works. My crappy test amp couldn't tell the difference. Plugged into my Mesa and there you go :) Sounds alright but I think I'll stick with Honey Bee over this.

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  5. Link removed and I re-jigged things about a bit which shaved off a column. Thanks for that John and krzabe

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  6. DONE! I LOVE this one! (works great on bass too!)

    pics:

    http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/BJFE/ModelG-01.jpg

    http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/BJFE/ModelG-02.jpg

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    1. Very nice John, thanks for the pics

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  7. John you using white LEDs? does the colour of the LEDs matter for this build? or can i just use green/super brights (have spares)

    Gonna try to build this after i'm done with my Honey Bee and Sweet Honey, then do a side by side comparison of the 3, really interested to know the difference...

    or if somebody already has built the 3, maybe can do the honours?

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  8. my leds are waterclear reds. if you use green ones, it'll have less clipping since reds have a lower forward voltage than greens.
    I've also built the sweet honey and the honey bee, and IMO, they're all great. I've also built the Sky Blue OD, the Dyna red, the stone grey distortion, the blueberry bass OD, the artic white fuzz, the pink purple fuzz and the little green wonder as well as the sea blue eq & deep blue delay and ALL of Bjorn's designs sound great.

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    1. between the Honey bee, Sweet Honey and Model G, could you describe some of the differences in terms of sound? Can you share a short audio clip with the 3 side by side?

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    2. I use my pedals with a bass. it's now after midnite in socal. but i'll try to make a short clip of them tomorrow with a guitar.

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  9. so what do you use now? these demos make everything sound awesome. is there a chart that shows the clipping to colour hierarchy? will socket them i guess... just gotta get the sockets

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    1. I use whichever one that I feel suits what i'm playing. they all have a different 'voice' to them.

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    2. ahh the joys of being a pedal builder...

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    3. John, where do you get the indicator/pilot lamps that you use on your pedals?

      TIA, G

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  10. from mouser:

    http://www.mouser.com/catalog/catalogusd/646/178.pdf

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  11. Hi,

    what is R=2K61? 2K6+1 aka 2K7?

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    1. 2610 ohm. There usually are some of these "non-standard" values on BJFE designs. I bet you'll be fine with 2K7.
      +m

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  12. What means 20K W? Is it a reverse poti (Alpha 20KC)?

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    1. That's W-taper, the kind that's used a lot on Tubescreamers.
      http://www.taydaelectronics.com/potentiometer-variable-resistors/rotary-potentiometer/w-taper/20k-ohm-w-taper-w20k-tone-control-potentiometer-with-center-detent.html
      +m

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  13. I like the sound of this one,but how can I make it brighter? the C knob turned all the way up it just starts to get to the right bright highs.is there a way to add a bright switch to this circuit?or what caps control the treble? maybe I can swap out different values to find what I like

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  14. Hallo, I m looking for the parts to build this one, but I cant find 2n5952 as easy as other FETs, mad professor seems to be a little picky about their parts, does it? So, should I ask Musikding for that FET, or there are other FET that can replace that one? Some favourite maybe?

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    Replies
    1. Just use another 2N5457, or if you have a few different types like J201 try them too

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  15. Hi there,
    Can someone post the voltages and tell if he could sucessfully use a drop-in for the 2N5952 that I definitely cannot get hold of?
    Thanks a lot!

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    1. This comment has been removed by the author.

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