Dunlop - JHF3 Band of Gypsys Fuzz Face  [traced]

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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby johnk » 14 May 2018, 19:05

does anyone know which BC558 they used? BC558A, BC558B, or a BC558C?
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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby Manfred » 15 May 2018, 00:44

http://2.bp.blogspot.com/-WHEH8n47CYc/T_Wo5NBgvFI/AAAAAAAABpU/bPHZnpJDbyQ/s1600/JH-F1+png+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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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby bc108 » 15 May 2018, 01:37

Or the MPS3904 (almost the same as 2N3904), that I've read comes in the original.
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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby johnk » 15 May 2018, 02:02

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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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby bc108 » 15 May 2018, 04:03

Yep... I guess 200 to 400 hfe are in the right values.
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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Postby johnk » 16 May 2018, 21:34

just finished etching the enclosure for mine:
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alexradium (17 May 2018, 19:55), bc108 (16 May 2018, 23:12)
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