Revox B215 upgrade circuits

Change red marked coupling cpacitors with Wima 3.3 uF/50V film capcitors or Nichicon Muse capacitors ( No polarity )

Change Multiplexor ICS for MAX 40**ACPE 

special level shifting work is need for MC4066 

go to www.tapeheads.net/showthread.php?t=5289&highlight=Alex+b215+4051 for more info.