[Amps] Grid grounding material?

[paule at sfu.ca]

I am getting ready to directly ground the grids of the 3-500's in one of my SB-220s'.I have some copper strap that I was planning on using, but was wondering if I should tin the whole piece to prevent possible corrosion issues between the aluminum and the copper? 


cheers, Paul - VA7NT ex VE7CQK - email: paule at sfu.ca
"Those who hear not the music. . . think the dancers mad."