I've been servicing guitar amps for awhile now but I still have a lot to learn, particularly when it comes to solid state amps. Recently I replaced a switch for the boost feature on a Traynor TS120B bass combo (schematic attached). I'm OK with understanding schematic symbols etc but I'm often stumped as to how various components interact with each other. So I was curious as to what is in fact happening with the 2N5245 JFET when the boost switch is engaged. To put it bluntly, how does the 2N5245 JFET (along with other components) increase the signal level? Is the 2N5245 JFET providing more current to the TL071 op amp by virtue of it being connected to ground when the switch is engaged? Any insight is much appreciated, thanks.
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