doing a google search using " Big difference between BAT 75 and 75se"
i found the following info :
" The VK-75 is the replacement for the VK-60. It has more power than the VK-60 (75 watts per channel instead of 60). The VK-75SE (SE means Special Edition) utilizes the new 6H30 tube that BAT's designer, Victor Khomenko, is extremely proud of.
The VK-75SE's power supply stores 700 Joules of energy. That is a big number for 75 watts per channel, but that is what it takes for a top notch amplifier. The output is in Class A to 64 watts (each channel). This is another reason for having a big power supply, because the high Class A output means the amplifier is dissipating about 250 watts of heat (each channel) at idle"
you could always contact him via email or phone and ask him also.