[Amps] amp hardware

[k7fm]

Antenna hardware often combines aluminum with stainless steel.  Both 
materials are anodic and the potential difference is low.  Cadmium plated 
bolts are not much greater difference and can be used.  Brass and gold are 
at the opposite end of the spectrum (cahtodic) and offer more potential for 
corrosion - although inside there is often little problem.  Electrolysis can 
sometimes be seen with aluminum chassis and iron based lockwashers in ham 
gear that has been sitting in a damp basement for 40 years.  If you plan on 
doing that with your amp, try to stick with stainless steel.  Or you could 
coat the fasteners with an anti-corrosion material like they do in auto 
engines during assembly.

Colin  K7FM