Hello. I want to ask about few things that have been bothering me recently a lot.1) I've seem some solid state guitar schematics. My question is, why don't they ever use op-amps in solid state amplifiers?
2) I've seen some tube schematics tubes are used, and on the gird of the input stage tube, there is a resistor (about 100k-500k) that goes from the grid straight to the ground. My question is, if they want high input impedance, why would they put a resistor and not just connect the input to the grid resulting in very high input impedance?3) Assume there is a capacitor before the input stage, and we want to have lots of negative feedback. Does it matter were we feed the signal back to increase the bandwidth of the amplifier?
Thank you for your response!