Originality, repairs and replaced parts

A professional repair does not automatically make an item "worse", but it must be evaluated in the right context.

On recent gear intended primarily for use, a correct replacement may have limited impact. On vintage, rare or collectible equipment, original parts, solder joints, transformers, speakers, finishes and components can matter much more.

Always document what was replaced, why and by whom if known. Keep invoices and original parts where available.

If originality cannot be verified, do not present it as certain. A reliable valuation distinguishes between what is documented, what is probable and what is merely claimed.