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metal chassis has built in isolation mounts (plastic inserts) that isolate the chassis from the cabinet. Also any tube shields need to be in place (not allowed to come into contract with the metal cabinet.
the drop may have bent the cabinet enough to come into contact with the chassis OR damaged a isolation mount Or knocked a tube shield loose.
All safety caps should have been replaced already as well.
Too be extra safe if you are accident prone would be to use an isolation transformer.
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