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Many HF radios have a setting for "Transmit Delay" to delay the start of RF to a linear amplifier to make sure that the amp's relay is closed before RF hits it to avoid hot-switching the amp. I don't know of any such setting in the TX-500. Is there any reason why it would not have that feature? Perhaps the TX-500 designers didn't think anyone would use a linear amp with it? I am a CW op.
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73, Norm/KC1BMD

Norm:

You may have difficulty using a solid-state amplifier. The 500 has spikes out at 43 kHz (both sides) that will trip out the SWR protection of the amp.

Chuck w8mqw

I'm using the DIY599 PA500 SS amp now without any trips due to SWR. I was thinking more about preventing hot switching on key-down with a "transmit delay". Key up hot switching can be controlled somewhat with a "hang time" delay setting which the PA500 has (only effective for RF-sense keying, not direct-cable-keying).
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73, Norm/KC1BMD