Tubes on Sun Audio SV2A3

Dear users of the SV2A3,
The 6SN7 on this amp is the 6SN7GT. According to the tube table, 6SN7 isn't a subtitle of the 6SN7GT, but have you tried? Also, the 5692?
The rectifier is 5U4g and I know 5AR4 is the subtitle, did anyone try using 5AR4 on this amp?
Thanks.