Where can I find suitable replacement tubes for portable / suitcase record players?

For portable record players with tube technology, suitable replacement tubes are mainly sought for preservation and restoration. This applies to many portable record players and compact music cabinet units from Dual, Philips, Grundig, Perpetuum Ebner, Telefunken or similar manufacturers. Typical tubes in this field include, depending on the device, ECL82, ECL86, UL84, UY85, UCL82 or ECC83. Anyone who wants to make a portable record player operational again or preserve it in original condition should therefore look for the correct tube for the exact model.