how to modify power ocl 150 watt bass grea

this video is about how to modify the power ocl 150 watts so that the bass is steady, by using
small travo bass sound steady and kicking, just replace a few transistors
bd193 replaced with mje340 / bd140 replaced by mje350 / elko 47uf 25v replaced with 47uf 50v /
Elko 1uf 50v input is replaced with a 100n capacitor, the 0.5 ohm 5watt resistor is removed and
run or screwed using a cable, adding a 12k resistor for parallel to the 33k
even though using a small travo but the sound is steady and kicks.