On the first question, I have heard of the solder melting out of the pins on
the filaments of both the 3-500Z and the 3-400's. If that has happened to
your tube, you might be able to just re-solder it and be okay. Some have
said to silver solder it, but it seems to me that silver solder requires an
awful lot of heat and I would be careful doing that.
Second question: I wouldn't think that was a good idea, but then I'm no
expert, so hope Evan is out there, hi.
73,
Don, WB5HAK
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