In short :
Yes, you can use an amplifier more powerful than the rated power of a Torpedo product. With a Torpedo Studio or Reload, you can use an amplifier rated for more than 150W. With a Torpedo Live or Captor, you can use an amplifier rated for more than 100W. The only thing is : you just have to keep the output volume of the amp low enough.
In more details :
The Torpedo products are rated for a specific power (measured in Watts). This means that the internal loadbox can dissipate up to this amount of power (assuming proper ventilation). A Torpedo Live for example can dissipate anything between 0 and 100 Watts.
If more power is fed into the Torpedo, it will overheat, and go into overheating protection. You will be warned about this, by means of a visual indication, a volume drop, and/or a mute of the sound, depending on the Torpedo product (for more informations about the overheating protection, see this article regarding the Torpedo Live). So, in order to prevent the Torpedo to go into overheating protection, you have to fed it no more than its rated power.
Here is how to do that :
Every amplifier is rated for a certain amount of Watts. This means that the amplifer is capable of outputing this much power. However, this does not mean that the amplifier actually outputs this much power in any situation : a 150 Watts amplifier does not output 150 Watts as soon as it is turned on. The output power is related to the actual output volume of the amplifier, which is dependant on many things (amount of distortion, EQ, output level of the guitar...), but is mostly controlled by the Volume or Master Volume control. So if you keep the output volume of any amplifier low enough, no matter how powerful it is, you can make it output less than any chosen amount of power.
Of course, it is almost impossible to know what the actual output power of your amplifier is in any particular situation. In particular, please note that the power output is in no way proportional to the Volume control : when the Volume is set to 50% (12 o'clock), the output power is never half the rated power of the amplifier ! It can be 10%, 90%, or even already the maximum power.
So, if your amplifier is rated for more than what your Torpedo is rated for, you still can use it, you just have to play it low enough. For this, you will have to use your best judgement.
Here are some guidelines :
When using your amplifier with a Torpedo product for the fisrt time, monitor both the amplifier and the Torpedo. Does the amplifier sound OK ? Do the output tubes of your amplifier heat more than usual ? Do they turn red ? Is the air flowing out of the Torpedo really hot ? If anything seems wrong, don't insist, and lower the volume of your amplifier. If everything seems OK, you can go on.
On an adjacent topic, please refer to the user manual of the various Torpedo products for notes on what the ideal output volume is for your amplifier (regardless of its rated power). Playing an amplifier as loud as possible is not always the best idea.
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