thanks for all input lots of thought thanks
anyway i think JAZZ p Bass is on to something about the limiter upsetting things. put new mosfets in 60 watt limiter glowing bright .Installed preamp board and tube module.
light limiter went dim. put in 100 watt light bulb bulb went right down to faint glow.a bit later removed limiter and amp stayed on. tripped over myself and thoughtlessly hooked up speaker thinking this was it fixed at last. hooked up to input with signal nothing coming through and boom out go the lights. all four mosfets went down this time.
plus fuse.wtf happened here ,. seemed so close to success. anyway inspection right after 10 w 330 power supply resistor very hot. the other one not and as i pulled on it one leg of cold resistor came out of board. so my question is if this solder joint was disconnected at power supply resistor would that unbalance things enough to short rails to a ground some how turning on all four mosfets? as to the other discussion about q6 and q7 i am not sure those measurements are correct for base value. may have taken measurement from wrong place on board hard to get to pins under heat sink took measurement at closest resistor so could be wrong however double checked each one with meter when board was out and they both tested fine forward and reverse. so used up all my parts will order more and try again . thanks again for your help here. also just before the mosfets blew the amp light went out it is connected to each side of rails .