on a buster bass the output tubes are all inlline. when you replace a matched set of output tubes i assume those would be each set of two tubes next to each other in the row of six tubes. am i right? the reason i want to do this is becaiuse i get a small sizzle noise when amp is on and the volume level is set fairly high on the preamp and the master. this one does and its making me crazy. i may retube it today, but ill wait to hear some responses.