Help to understand amp schematic for Mesa Mark V

[caspercody]

I have built (4) different high voltage pre amp pedals based off of tube amp pre amps and all work great. I now want to build a Mesa Mark V, and I have almost everything planned out but I have a question on the pre amp schematic. Per the attached photo I circled the part I have a question about. So do I need all the parts circled? To me it seems some of these parts might be there for the reverb and really not needed or if removed will not effect the desired tone. Please let me know what you think

Thanks
Rob

[willienillie]

Can't see the whole schematic, but it looks like the relays bypass that entire portion when reverb is not selected.