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channel driven amps vs pedals / op-amps

the channel driven amps like the 5150, bogner, hughes and kettner, etc., do these use monolithic op-amps for their distortion channels?

do most (not multi-fx) guitar pedals (say for example boss, MXR, etc.) use discrete op-amps?

also do the orange and hiwatt multi-channel amps use monolithic or discrete op-amps for the distortion channels?