Dunlop - JHF3 Band of Gypsys Fuzz Face  [traced]

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johnk
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Post by johnk »

does anyone know which BC558 they used? BC558A, BC558B, or a BC558C?

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Manfred
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Post by Manfred »

http://2.bp.blogspot.com/-WHEH8n47CYc/T ... layout.png
In this fuzz face circuit are BC108 types applied, which are selected on HFE of 260.
That value can be found in the BC548B type HFE range.

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bc108
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Post by bc108 »

Or the MPS3904 (almost the same as 2N3904), that I've read comes in the original.

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johnk
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Post by johnk »

the reason that i asked is because, since i didn't have any BC558's (which is the first transistor and is a PNP) i tried a 2N2907A but i it just didn't sound right (too peaky and sharp). i then tried an MPS8598 with an hfe of 210 and it sounded really good. i also tried a BC559B with an hfe of 259 and that also sounds great.

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bc108
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Post by bc108 »

Yep... I guess 200 to 400 hfe are in the right values.

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johnk
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Post by johnk »

just finished etching the enclosure for mine:
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Band Of Gypsys Fuzz-600.jpg
Band Of Gypsys Fuzz-600.jpg (37.38 KiB) Viewed 2065 times

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Nocentelli
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Post by Nocentelli »

Quick redraw of the schematic:
BoG_schematic_nocentelli.bmp
BoG_schematic_nocentelli.bmp (63.61 KiB) Viewed 1816 times
modman wrote: Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...

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