The 7 Series Overdrive captures the aggressive qualities of the solid state preamp found in the 4&7 series amps by using a pseudo hybrid setup consisting of a specifically selected silicon transistor for the first stage which adds a distinct bite and growl. That pushes an FET stage into clipping adding some warmth, sustain and amp like dynamics to the tone and feel. The end result is a highly effective emulation of the amp and a unique sonic blend that could be characterized as a "fuzzy overdrive."
The 220nFs in your layout are just 22nFs in the FSB schematic.
ReplyDeleteFixed. No idea why I read them as 220n. haha
DeleteVerified! But I use 100K trim instead to get the bias of Q2 around 4.5V. Great sounding pedal, love it!
ReplyDeleteAwesome! Thanks for verifying!
Deletewhere does q1 go, and where does q2 go?
ReplyDeleteQ1 is on the left (marked by EBC) and Q2 is to the right (GSD).
Deletehow can i get cleaner sound? with the gain pot all the way down still gives me a distorted sound, already try to set the trimpot to sending less volts to the 2n5457 but doesn't work
ReplyDeleteTry reducing the value of the 10k resistor on top left side of the board (coming off lug 1 of the gain pot to ground).
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