Legend R&R 50 tube pre-S.S. ungodly power ability Miss Fayetteville petite skull sound of ZZ Top

Multi faces of Eve/ Miss Fayetteville; amplifier overall face lift dance hall girl; at present still constant grackle/crackle-believe to be output transistors/overheat problem. eliminated output transistors as cause of grackle; checking a thermal sensor on aluminum heat sink assembly-( out of 4 Legends my 1st with this part riveted to it ); gonna check its function and try freeze for crackle source; day to day changes;  please ask for latest status or current condition before offers ! I've added a 4th Plexiglass face for when she's ready to shine. still have grackle from get go; testing different preamp tubes that will best address overheating/thermal cut out of Power switch/bias issues/and or overheat of aluminum heat sink/chassis...works great/sounds glorious albeit some grackle still for awhile...cleaned every pot/jack. going backwards- works 12-15 minutes-blew 2A fuse; like a Sovtek that pot to PCB seems to be problematic- generates heat from pots to chassis-freeze of EQ section pots seemed to help for a day.. to isolate..no burnt parts on boards-still always grackle from the git go.