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Re: Dunlop - JHF3 Band of Gypsys Fuzz Face
Posted: 14 May 2018, 18:05
by johnk
does anyone know which BC558 they used? BC558A, BC558B, or a BC558C?
Re: Dunlop - JHF3 Band of Gypsys Fuzz Face
Posted: 14 May 2018, 23:44
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.
Re: Dunlop - JHF3 Band of Gypsys Fuzz Face
Posted: 15 May 2018, 00:37
by bc108
Or the MPS3904 (almost the same as 2N3904), that I've read comes in the original.
Re: Dunlop - JHF3 Band of Gypsys Fuzz Face
Posted: 15 May 2018, 01:02
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.
Re: Dunlop - JHF3 Band of Gypsys Fuzz Face
Posted: 15 May 2018, 03:03
by bc108
Yep... I guess 200 to 400 hfe are in the right values.
Re: Dunlop - JHF3 Band of Gypsys Fuzz Face
Posted: 16 May 2018, 20:34
by johnk
just finished etching the enclosure for mine:
Re: Dunlop - JHF3 Band of Gypsys Fuzz Face
Posted: 22 Jul 2020, 22:08
by Nocentelli
Quick redraw of the schematic:
- BoG_schematic_nocentelli.bmp (63.61 KiB) Viewed 1853 times
