What is the best type solder for heat sensitive components

its not solder, but maybe you can use Heat Sink Tweezers
This can be a great idea to save sensitive components. Just clip the tweezers on the lead on the component side of the joint being soldered. Use the thinnest solder you can manage as it melts quicker than thick solder so you don’t have to sit there with the iron blazing for extra time melting it. Pre tin the lead being soldered with a quick light coat of solder to aid good flow. Use your best judgement as to how much heat is too much heat.
 
If you are planning to change components in a home theatre amplifier, they will be very small
surface mount parts, and difficult to work with. Not recommended to attempt, unless you have
considerable previous experience, as well as the proper equipment.
 
Those things are cheap, and parts not available.
Where are you located?
What is the problem in your unit?

If you need to, get it done by a person who repairs cell phones, or computer mother boards.
They will have the tools, materials, and above all experience in doing it.

For SMD work, combination pastes with flux and solder powder are sold, it is applied to the joint, then hot air from work station is used to make the joint.
 
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