VTL Tube amps power

Hi all, I have VTL 300 Deluxe which is 300W/chanel with 8 power tubes in each chanel. Since I don't need that much power for my second system, can I just pull out 6 tubes in each side and just leave 2 of them for each side which is about 75W/chanel, then check the bias to lower the power and also save the tubes? Does it hurt any thing to the amp down the road?. Thanks alot for any informations