OK, let's see ya top THIS story..............

There are audio driven devices to indicate off resonance and other factors, some of which he built. This old girl was fairly bulletproof. It was 'grounded grid' with no screen voltage so it took a LOT of drive, and did not run all that much plate voltage, I think maybe 3500? You probably could not hurt it much

How do you keep those tubes healthy with no base cooling? They are supposed to be forced air at least for the bases