Marshall TSL100 Crunch vs. Lead channels...?

[acorkos]

Looking at the schematics, I can see the gain pots have different values, along with one resistor and one capacitor being different between the 2 channels....but I can't make sense of the connectors from the channel PCBs to the preamp tubes/gain stages. Are there more preamp tube gain stages in the Lead (red) channel compared to the Crunch (yellow) channel?

Crunch PCB

Lead PCB

Main PCB

[Pedro Vecino]

Gain stages are common to both channels. Enabling the lead channel is incorporated in parallel with the cathode resistor a 1uF capacitor in the second triode of V1.