They're usually VSWR tripped.  I f you want one to operate with high vswr,
then you need a circulator or isolator to absorb the reverse power.

----------
>From: [email protected]
>To: [email protected]
>Subject: Radiated immunity testing above 1 GHz
>Date: Wed, Nov 13, 2002, 8:00 AM
>

>
> I need to make a decision on an amplifier for radiated immunity testing in
> the 1-2 GHz range. The choices appear to be a new solid state amplifier ( I
> have not located a used one) or a used TWT amp. Is anyone using a TWT
> amplifier for radiated immunity testing above 1 GHz? Do I need to be
> concerned about protecting the tube from damage caused by excessive VSWR
> cause by, perhaps, chamber effects? Is there anything else I need to know
> about TWT amps (yeah, I know - throw it way if the tube dies)?
>
> Richard Woods
> Sensormatic Electronics
> Tyco International
>
>
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