Amplifiers typically need a tune-up once a year if you're a gigging musician. My tune-up jobs include:
Testing all tubes
Cleaning and lubricating potentiometers (knobs)
Inspecting all jacks
Testing high voltage filter capacitors.
Cleaning all tube sockets
Performing a general cleaning of all accumulated dust, dirt, and grime
Inspecting of all components for loose connections or poor solder joints
Standard shop rate is: $70 per hour.
Most repairs are charged 1-3 hours of labor. Parts are not included.
Current turnaround time for most repairs is 2 weeks.
All repairs must be picked up with 60 days. After that, they will be treated as abandoned and I will sell the item to recoup costs.
That old amplifier you found in your attic will need to be serviced. These are among my favorite pieces to work on.