Do not sacrifice safety and reliability in pursuit of originality

On amplifiers, power supplies and mains-powered equipment, safety takes priority over preserving every component for cosmetic originality.

Do not keep deteriorated parts or unsafe configurations solely to maintain an originality claim. Use qualified technicians when hazardous voltages or electrical safety are involved.

Retain removed parts where appropriate and document the technical reason for the work.

An item can be historically important and responsibly maintained even when some safety or wear-related parts have been replaced.