[Amps] 3-500Z filament

[nagato at arnet.com.ar (Guillermo)]

        Hello, a friend have trouble in his linear with (apparently, I did not
check it by now, but that seems to be the problem) a faulty contact in
filament tube pins. If not a socket faulty contact and If in need to
re-solder tube's pin, may I have any care regarding solder?, Sn% Vs.
Pb%?
        I did not found an entry in the list's archives regarding that matter,
so I ask here..

TIA
Guillermo - LU8EYW.