Help, NAB to CCIR for Presto A908

[mg73]

I´m converting my tape machine (Presto A908) to 15/30 IPS CCIR AES from NAB
Can´t find any info how to to convert it
I managed to get it in the ballpark in rec and repro but would appreciate
more scientific view on exactly which caps/resistor needs to be replaced/removed to get a proper
equalizer curve for CCIR AES 15/30 IPS
I believe it´s 7.5/15 NAB right now on the schematic
Here is the schematic

 

[ssp3]

Complete schematic would be required first..

 

[工聚匠神]

Hello,I have One Presto A908,I can't find any information about this machine, Could you private message me the complete schematic of this machine，I also wan't to converting 15/30 IPS CCIR AES from NAB.Thank you!