myles: i apologize if i am duplicating my post. i have 50's and 60's fender and gibson amps which have bad tremolo/vibrato circuits which need repair. an audio repair tech told me that they are not repairable. is this true? if not, where would i find the proper parts to get them repaired. the amps are: 1967 fender pro reverb, gibson ga15rvt, ga20t, ga20rvt and ga79rvt. thanks in advance.