Yes and thanks for your advise, l know some component at different position with some parts# for different pcb family, but after compare the face side, rectifier(or may call high gain board) look like bypass some parts in stage one of british pcb and add component to each tube, so, need a back...
As topic, need some photo of grail back side to compare the different with other module, just know grail PCB take out some parts like R13, 14, 15...etc and some bypass component, thanks very much!
The Gigmod one remove the C13, and compare with spreadsheet, there only C3, R7 and C14 different than Plexi...
Due to thin bass, any suggestion for C16 and C17, keep at 0.022u with better cap or 0.047u? Thanks!