NoFi a écrit :
Oui oui c'était des 2N5087, PNP, donc la pédale étant en positive ground, bien pénible ça pour utiliser avec une alim.
BC239 (NPN) hfe > 120 - 800
Si tu as une lettre A b ou c en plus dessus on pourra savoir plus précisément le gain (le hfe).
Citation:
the BC239 is a low gain transistor with MUCH less agin than the 5088. By the way, the BC239 sound very close to the original FS36999 transistors often found in the early Big Muff´s.
Citation:
At one point, E-H used BC239 transistors for the BMP, and some prefer the sound of those units. These are moderately high hfe, though clearly not in the same ball park as 2N5089 or MPSA18 units that can have an hfe in the 800's.
Of course, with so many other variations in what E-H stuck into those pedals, the variation within components of the same type and part number, and given the unit-to-unit variation within pedal issues (and remember that people who post about such things may have only tried maybe one or two examples of eaqch issue of the BMP) it is very hard to attribute any particular tone to a given transistor type.
Etc etc, ça se passe sur DIY stompboxes.
J'ai quelques modifs à faire sur des pédales , et je crois que tu est l'homme de la situation si ça te branche MP